{ "data": { "a": { "slug": "letta", "name": "Letta", "vendor": "Letta", "vendorUrl": "https://www.letta.com", "kind": "harness", "category": "agent-harnesses", "summary": "Letta, from the MemGPT team, is an open-source agent harness (formerly Letta Code) for stateful agents that keep memory blocks, skills and conversations across sessions, used from a CLI, chat.letta.com, messaging channels or the Agent SDK, with Letta Cloud.", "url": "https://www.anchorterminal.com/tools/letta", "markdownUrl": "https://www.anchorterminal.com/tools/letta.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/letta.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/letta.json", "dns": "letta.grade.anchorterminal.com", "repo": "https://github.com/letta-ai/letta-code", "license": "Apache-2.0", "transports": [ "stdio" ], "packages": [ { "registry": "npm", "name": "@letta-ai/letta-code" }, { "registry": "pypi", "name": "letta" } ], "auth": "mixed", "authNotes": "Local use needs only the user's own model keys or coding-plan logins through `/connect`. Signing in with Letta (`/login`, OAuth in the browser) stores agents in Letta Cloud and enables remote computers and secrets. Developer plans use Letta API keys.", "pricing": "freemium", "pricingNotes": "Free plan at $0 with bring-your-own keys and limited agents and storage. Pro $20 a month with Letta Auto quotas and up to 20 agents. API plan $20 a month plus $0.10 per active agent a month and $0.00015 a second of tool execution, with LLM usage at token cost.", "priceSummary": "$20 / mo", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the letta-code source, docs.letta.com's llms.txt or the pricing page (checked 2026-11-06).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 3793, "npmWeekly": 85863, "pypiWeekly": 2225, "asOf": "2026-11-06" }, "docsUrl": "https://docs.letta.com", "llmsTxt": "https://docs.letta.com/llms.txt", "capabilities": [ "agent.harness", "agent.mcp-client", "agent.multi-agent", "memory.store", "memory.search" ], "tags": [ "open-source", "local", "hosted", "freemium", "apache-2.0", "typescript", "cli", "headless", "telemetry", "llms-txt", "memory" ], "lastRelease": "2026-11-06", "graded": true, "anchor": { "graded": true, "score": 59.7, "grade": "C", "agentReady": false, "rank": 687, "ranked": true, "rankOf": 1510, "categoryRank": 18, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 67, "maintenance": 85, "payments": 60, "reliability": 58, "schema": 70, "security": 35, "transparency": 55 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.", "bestFor": "Long-lived coding agents and assistants that keep memory and identity across sessions and machines.", "strengths": [ "Apache-2.0 harness on npm and PyPI with 0.34.42 released on 6 November 2026, and releases most days", "Memory blocks and MemFS keep an agent's context in git, with optional sync to the user's own repository", "Headless runs with `-p` and `--output-format json`, plus a TypeScript Agent SDK and a self-hosted App Server", "Public prices, a $0 plan with bring-your-own keys, and an API plan at $20 a month plus $0.10 per active agent", "Runs locally without signing in, with `letta backend local` or `--backend local`" ], "weaknesses": [ "The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode", "Letta Cloud is the default backend, so agent memory and conversations go to Letta's servers unless the user chooses local", "Usage telemetry is on by default, with the LETTA_CODE_TELEM=0 opt-out found only in the source", "The Letta V1 Python API server is retired and unsupported, and the letta-ai/letta repository is now a landing page", "The privacy policy names no legal entity or date and says hosted message data may train future models" ], "agentNotes": [ "Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools", "Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default", "Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent", "Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output", "Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.7 } ], "editorialScores": { "ergonomics": 67, "maintenance": 85, "payments": 60, "reliability": 58, "schema": 70, "security": 35, "transparency": 55 }, "provenanceScore": 54, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm install -g @letta-ai/letta-code", "headless": { "local": "letta --backend local", "run": "letta -p --output-format json \"\u003ctask\u003e\"", "server": "letta server" } }, "letme": { "capability": "https://letme.dev/agent.harness", "tool": "https://letme.dev/letta" }, "alsoIn": [ "agent-memory" ], "area": "frameworks", "unitPrices": [ { "item": "Pro plan", "unit": "month", "usd": 20, "note": "Letta Auto quotas, up to 20 agents" }, { "item": "API plan active agent", "unit": "month", "usd": 0.1, "note": "Plus $20 a month base and $0.00015 a second of tool execution" } ], "provenance": { "legalEntity": "", "domain": "letta.com", "domainRegistered": "1997-10-01", "endpointOnVendorDomain": null, "terms": "https://www.letta.com/terms-of-service", "privacy": "https://www.letta.com/privacy-policy", "statusPage": "", "changelog": "https://github.com/letta-ai/letta-code/releases", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The privacy policy shows no last-updated date and names no legal entity, only Letta. It says hosted message data may be used to train new models and that basic telemetry can be turned off in settings when supported.", "www.letta.com and docs.letta.com robots.txt allow all crawlers.", "RDAP gives letta.com a registration date of 1 October 1997, which predates the company, so the domain was bought later.", "/.well-known/security.txt returns 404. SECURITY.md in letta-ai/letta asks for reports to support@letta.com.", "The terms URL is the conventional path and was not read; the policy reader checks it at landing." ], "score": 54 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/letta.json", "live": { "slug": "letta", "versions": [ { "registry": "github", "name": "letta-ai/letta-code", "version": "v0.34.43", "released": "2026-11-06", "seenAt": "2026-11-06T23:39:39.434291816Z" }, { "registry": "npm", "name": "@letta-ai/letta-code", "version": "0.34.43", "seenAt": "2026-11-06T23:39:38.413416142Z" }, { "registry": "pypi", "name": "letta", "version": "0.34.12", "released": "2026-10-12", "seenAt": "2026-11-06T23:39:39.241816797Z" } ], "githubStars": 3794, "npmWeekly": 85863, "pypiWeekly": 2225, "securityTxt": { "url": "https://letta.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:02.768002207Z" }, "llmsTxt": { "url": "https://docs.letta.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:52.28674296Z" }, "pages": [ { "url": "https://www.letta.com/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:30:46.549817082Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "947a68f3e3a0" }, { "url": "https://www.letta.com/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:30:48.740250784Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "63f31d6ebfb8" } ], "updatedAt": "2026-11-07T16:01:02.768002207Z" } }, "answer": "Letta scores 59.7 (C) on agent readiness against Unstoppable's 34.7 (F), and leads in 5 of 7 scored categories.", "b": { "slug": "unstoppable", "name": "Unstoppable", "vendor": "Unstoppable Domains, Inc.", "vendorUrl": "https://unstoppable.ai/", "kind": "harness", "category": "agent-harnesses", "summary": "Unstoppable, from Unstoppable Domains, is a desktop agent IDE for macOS and Windows that runs Claude Code, Codex, Cursor and other coding agents side by side in separate Git worktrees, with Remote Control from iOS, Android and the web.", "url": "https://www.anchorterminal.com/tools/unstoppable", "markdownUrl": "https://www.anchorterminal.com/tools/unstoppable.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/unstoppable.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/unstoppable.json", "dns": "unstoppable.grade.anchorterminal.com", "license": "Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published", "transports": [], "packages": [], "auth": "none", "authNotes": "No credential for an outside agent, because the app exposes no agent interface. A person can use the desktop app as a guest, or sign in through the browser with Google or GitHub, with optional authenticator-app two-factor authentication. Claude, Codex and Cursor connect through their own sign-ins in Settings, Accounts.", "pricing": "freemium", "pricingNotes": "Free to download, and the app is published as free. Agents run on the owner's Claude, ChatGPT or Cursor plan, on Ollama locally, or on AI credits. 10 free AI credits a day once turned on, no card. Credit prices appear only after sign-in. A 14 October post says a plan may not include Remote Control, and an 11 August post lists $19, $29 and $49 plans that no pricing page shows.", "priceSummary": "Freemium", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 on the site, the help centre, the terms or llms.txt (checked 2026-10-27). AI credits are bought on the billing page after sign-in; the site's content security policy allows Stripe.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-27" }, "docsUrl": "https://unstoppable.ai/support", "llmsTxt": "https://unstoppable.ai/llms.txt", "capabilities": [ "agent.multi-agent", "agent.harness", "agent.mcp-client", "code.git", "browser.control" ], "tags": [ "not-for-agents", "closed-source", "desktop-app", "macos", "windows", "ios", "android", "local", "hosted", "cloud-agent", "freemium", "byo-plan", "no-card", "approvals", "llms-txt", "new" ], "lastRelease": "2026-10-23", "graded": true, "anchor": { "graded": true, "score": 34.7, "grade": "F", "agentReady": false, "rank": 1400, "ranked": true, "rankOf": 1510, "categoryRank": 56, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 5, "maintenance": 58, "payments": 30, "reliability": 45, "schema": 30, "security": 36, "transparency": 56 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-27" }, "negative": 0, "verdict": "Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.", "bestFor": "A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.", "strengths": [ "Each task runs in its own Git worktree, so parallel agents don't overwrite each other, and the app opens the pull request when asked", "Runs Claude Code, Codex and Cursor on the owner's own plans, Ollama models locally, or hosted models on AI credits, with 10 free credits a day and no card", "Activity sharing to Unstoppable's cloud is Off for every activity type on every plan by default, and secrets are removed before any upload, per the privacy policy", "Approval modes Ask and Accept edits with allow and deny rules by command, file write, MCP tool or network host, where deny wins and safety rules block force-pushes", "A dated changelog for versions 1.12.0 to 1.15.0 (20 to 23 October 2026) and 22 help articles updated between 19 and 24 October 2026" ], "weaknesses": [ "No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines", "Every kind of chat starts in Full access, which skips approval prompts and the safety rules for risky commands, until the person changes the default", "The home page says every app feature is free when signed in, while a 14 October post says a plan may not include Remote Control and the governance page ties controls to subscriptions", "AI credit prices are shown only after sign-in, and no status page covers the accounts, cloud agents or Remote Control relay", "No security.txt on unstoppable.ai. The parent's security.txt expired on 22 January 2024 and its bug bounty policy link returns 404" ], "agentNotes": [ "Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them", "Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals", "When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits", "Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "F", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 34.7 } ], "editorialScores": { "ergonomics": 5, "maintenance": 58, "payments": 30, "reliability": 45, "schema": 30, "security": 36, "transparency": 40 }, "provenanceScore": 72, "checked": { "categories": { "ergonomics": "2026-10-27", "maintenance": "2026-10-27", "payments": "2026-10-27", "reliability": "2026-10-27", "schema": "2026-10-27", "security": "2026-10-27", "transparency": "2026-10-27" }, "last": "2026-10-27", "lastMoved": "2026-10-30", "oldest": "2026-10-27", "stale": false, "staleAfterDays": 90 } }, "letme": { "capability": "https://letme.dev/agent.multi-agent", "tool": "https://letme.dev/unstoppable" }, "area": "frameworks", "provenance": { "legalEntity": "Unstoppable Domains, Inc.", "domain": "unstoppable.ai", "domainRegistered": "2021-01-05", "endpointOnVendorDomain": null, "terms": "https://unstoppable.ai/terms", "privacy": "https://unstoppable.ai/privacy", "statusPage": "", "changelog": "https://unstoppable.ai/changelog", "securityTxt": "none", "checked": "2026-10-27", "notes": [ "The terms (effective 6 October 2026) name Unstoppable Domains, Inc., choose Delaware law and AAA arbitration, and cover the desktop app, web surface, a command-line interface and an optional agent cloud.", "The privacy policy (effective 8 October 2026) is written for this product and names privacy@unstoppabledomains.com as the contact.", "RDAP gives a registration date of 5 January 2021 for unstoppable.ai, with a registrar transfer on 28 July 2026.", "unstoppable.ai/.well-known/security.txt returned 404 on 27 October 2026. unstoppabledomains.com/.well-known/security.txt expired on 22 January 2024 and its policy link, /bug-bounty, returns 404.", "status.unstoppabledomains.com lists the domains business's web application and APIs, with no component for Unstoppable.ai.", "No endpoint an agent calls, so none is recorded." ], "score": 72 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/unstoppable.json", "live": { "slug": "unstoppable", "securityTxt": { "url": "https://unstoppable.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T15:59:31.331691884Z" }, "llmsTxt": { "url": "https://unstoppable.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:34:14.435255153Z" }, "domain": { "domain": "unstoppable.ai", "registered": "2021-01-05", "source": "https://rdap.identitydigital.services/rdap/domain/unstoppable.ai", "checkedAt": "2026-11-01T14:09:36.833511396Z" }, "pages": [ { "url": "https://unstoppable.ai/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:22:55.442924269Z", "changedAt": "2026-11-05T13:07:19.145766611Z", "fingerprint": "75920cd30c3f" }, { "url": "https://unstoppable.ai/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:22:57.94858931Z", "changedAt": "2026-11-05T13:07:21.56851618Z", "fingerprint": "6a38cb7b40b1" }, { "url": "https://unstoppable.ai/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:22:59.937806382Z", "changedAt": "2026-11-05T13:07:23.583518937Z", "fingerprint": "fda8dce50002" } ], "updatedAt": "2026-11-07T15:59:31.331691884Z" } }, "edges": [ { "by": 62, "category": "ergonomics", "leads": "letta", "name": "Agent ergonomics", "reasons": { "a": "Harness reading. Toolsets switch with `/model`, skills load per agent, and subagents run in the background (18 of 25). Context is managed through memory blocks, reflection and dreaming (12 of 20). `letta -p --output-format json` for scripted runs and an App Server for programmatic control (12 of 20). Conversations resume by agent and conversation id, and memory is git-tracked so changes can be reverted (15 of 20). Runs with no account on the local backend, with one SDK language, TypeScript (10 of 15). Total 67.", "b": "These lines measure an interface an agent calls, and Unstoppable has none, so context cost, output controls and retries score nothing. For the person, a usage limit shows choices to wait for the reset or continue on credits (2 of 20). Guest use with no account, a first-run page that imports Claude and Codex projects, and few required settings. No SDK (3 of 15). Total 5." }, "scores": { "a": 67, "b": 5 } }, { "by": 40, "category": "schema", "leads": "letta", "name": "Schema \u0026 documentation", "reasons": { "a": "Harness reading. docs.letta.com serves llms.txt and a Markdown version of every page, with an `applies_to` block saying which backend and interface each page covers (10). TypeScript types for the Agent SDK and a documented App Server WebSocket protocol, but no JSON Schema or OpenAPI for the harness (15 of 25). Pages say when to use local or cloud backends, subagents and channels (14 of 20). Permission modes and options are typed in the SDK (12 of 15). Example applications and a remote client reference (11 of 15). Releases most days but no changelog file (8 of 15). Total 70.", "b": "Graded on the interface an outside agent can use, which is none. No API, OpenAPI file, MCP server or documented command (0). unstoppable.ai/llms.txt lists the product, help and policy pages in Markdown (10). Twenty-two dated help articles explain for a person what each part does and when to use it, such as Code and Work modes and approval modes (5 of 20). No typed inputs an agent could call (0). Step-by-step examples for people and named error states such as usage limit reached and update failed, with no error responses for an agent (3 of 15). Numbered versions and a public dated changelog, which lists only four releases from 20 to 23 October 2026 (12 of 15). Total 30." }, "scores": { "a": 70, "b": 30 } }, { "by": 30, "category": "payments", "leads": "letta", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0 of 40). Per-unit API prices are public, $0.10 per active agent a month and $0.00015 a second of tool execution, plus plan prices (20). A $0 plan with bring-your-own keys; no card is mentioned (20). The CLI runs locally without signing in (20). Total 60.", "b": "No x402, MPP or L402 (0). The app is published as free, but AI credit prices appear only after sign-in, and no pricing page exists (unstoppable.ai/pricing redirects to the home page). Plan prices of $19, $29 and $49 appear only in an 11 August 2026 blog post (10). Guest use with no account, and 10 free AI credits a day with no card (20). A person has to download and install the app, so no autonomous onboarding (0). Total 30." }, "scores": { "a": 60, "b": 30 } }, { "by": 27, "category": "maintenance", "leads": "letta", "name": "Maintenance \u0026 community", "reasons": { "a": "v0.34.42 on 6 November 2026 (30). Dozens of releases in 90 days (20). Pull requests are merged daily; recent issues from users have few replies (15 of 25). npm and PyPI packages and the Agent SDK track the releases (12 of 15). Lock files, CI and nightly smoke tests (8 of 10). Total 85.", "b": "Read for a closed product. Version 1.15.0 on 23 October 2026, and iOS 1.1.9 on 27 October (30). Four desktop releases from 20 to 23 October and nine iOS updates since 11 August 2026 (20). A public changelog, a support email, in-app feedback and a Discord server, none tested for replies. Help articles were updated between 19 and 24 October (6 of 15). No SDK and no MCP registry entry (0). Windows updates check signatures per the 1.13.0 notes, with no build pipeline to inspect (2 of 10). Total 58." }, "scores": { "a": 85, "b": 58 } }, { "by": 13, "category": "reliability", "leads": "letta", "name": "Reliability", "reasons": { "a": "Local-software lines, read for the harness. `@letta-ai/letta-code` on npm with Node.js 22.19 or newer, and PyPI wheels for glibc Linux, macOS 14 and Windows x64 with Python 3.9 or newer stated (20). ci.yml, nightly update smoke tests and Telegram live smoke tests exist, but GitHub's API answered with a rate limit, so run results were unread (15 of 25, unchecked). 332 open issues and pull requests, mostly pull requests; recent bug reports such as recall reading the wrong conversation have no reply yet (15 of 25). 398 tags at 0.34.x with release notes on GitHub, no changelog file, and breaking removals such as AgentFile announced in the README (8 of 15). Pre-1.0 (0). Total 58.", "b": "Read as local software, because the product is the desktop app the owner runs, as for the other harnesses. Signed downloads for macOS Apple Silicon, macOS Intel and Windows on the download page, version 1.15.0, plus iOS and Android apps in the stores, with the supported platforms stated. No package registry (20). Closed source with no public CI or test suite (0). No public issue tracker. Bugs go through in-app feedback, email and Discord, none of which shows a record we could read (0). Version numbers and a dated changelog, but only 1.12.0 to 1.15.0 are listed and breaking changes are not marked as such (10). Version 1.15.0 (15). The hosted parts (accounts, AI credits, cloud agents, Remote Control) have no status page. status.unstoppabledomains.com covers the domains business only." }, "scores": { "a": 58, "b": 45 } } ], "facts": [ { "a": "Agent harness", "b": "Agent harness", "name": "Kind" }, { "a": "Letta", "b": "Unstoppable Domains, Inc.", "name": "Vendor" }, { "a": "no (local only)", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "stdio", "b": "", "name": "Transports" }, { "a": "OAuth or key", "b": "None", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0", "b": "Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-11-06", "b": "2026-10-23", "name": "Last release" }, { "a": "no date given", "b": "2026-10-06", "name": "Terms last updated" }, { "a": "no date given", "b": "2026-10-08", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "3.8k stars, 86k npm/wk, 2.2k PyPI/wk", "b": "none", "name": "Popularity" } ], "faq": [ { "answer": "Letta scores 59.7 (C) on agent readiness against Unstoppable's 34.7 (F), and leads in 5 of 7 scored categories.", "question": "Which is better for AI agents, Letta or Unstoppable?" }, { "answer": "Letta is open source (Apache-2.0). No open-source release is listed for Unstoppable.", "question": "Are Letta and Unstoppable open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 58 against 45", "Schema \u0026 documentation, 70 against 30", "Agent ergonomics, 67 against 5", "Payments \u0026 pricing, 60 against 30", "Maintenance \u0026 community, 85 against 58" ], "also": [ "Runs on your own machine", "Open source" ], "goodFor": "Long-lived coding agents and assistants that keep memory and identity across sessions and machines.", "slug": "letta", "watchFor": "The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode" }, { "aheadOn": null, "also": [ "No key needed to call it", "Free to start without a card" ], "goodFor": "A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.", "slug": "unstoppable", "watchFor": "No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines" } ], "history": { "letta": null, "unstoppable": [ { "causes": [ "method" ], "date": "2026-10-30", "delta": -0.2, "from": 34.9, "fromGrade": "F", "to": 34.7, "toGrade": "F" } ] }, "job": { "capability": "agent.harness", "name": "Agent harnesses" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-letta.json", "title": "Agent Zero vs Letta", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.json", "title": "Agent Zero vs Unstoppable", "url": "https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/aider-vs-letta.json", "title": "Aider vs Letta", "url": "https://www.anchorterminal.com/compare/aider-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/aider-vs-unstoppable.json", "title": "Aider vs Unstoppable", "url": "https://www.anchorterminal.com/compare/aider-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/amp-vs-letta.json", "title": "Amp vs Letta", "url": "https://www.anchorterminal.com/compare/amp-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/amp-vs-unstoppable.json", "title": "Amp vs Unstoppable", "url": "https://www.anchorterminal.com/compare/amp-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.json", "title": "Antigravity CLI vs Letta", "url": "https://www.anchorterminal.com/compare/antigravity-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/antigravity-cli-vs-unstoppable.json", "title": "Antigravity CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/antigravity-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/auggie-vs-letta.json", "title": "Auggie CLI vs Letta", "url": "https://www.anchorterminal.com/compare/auggie-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/auggie-vs-unstoppable.json", "title": "Auggie CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/auggie-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/axlr-vs-letta.json", "title": "AXLR vs Letta", "url": "https://www.anchorterminal.com/compare/axlr-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/axlr-vs-unstoppable.json", "title": "AXLR vs Unstoppable", "url": "https://www.anchorterminal.com/compare/axlr-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/claude-code-vs-letta.json", "title": "Claude Code vs Letta", "url": "https://www.anchorterminal.com/compare/claude-code-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/claude-code-vs-unstoppable.json", "title": "Claude Code vs Unstoppable", "url": "https://www.anchorterminal.com/compare/claude-code-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/cline-vs-letta.json", "title": "Cline vs Letta", "url": "https://www.anchorterminal.com/compare/cline-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cline-vs-unstoppable.json", "title": "Cline vs Unstoppable", "url": "https://www.anchorterminal.com/compare/cline-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/conductor-vs-letta.json", "title": "Conductor vs Letta", "url": "https://www.anchorterminal.com/compare/conductor-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/conductor-vs-unstoppable.json", "title": "Conductor vs Unstoppable", "url": "https://www.anchorterminal.com/compare/conductor-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/crush-vs-letta.json", "title": "Crush vs Letta", "url": "https://www.anchorterminal.com/compare/crush-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/crush-vs-unstoppable.json", "title": "Crush vs Unstoppable", "url": "https://www.anchorterminal.com/compare/crush-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/cursor-cli-vs-letta.json", "title": "Cursor CLI vs Letta", "url": "https://www.anchorterminal.com/compare/cursor-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cursor-cli-vs-unstoppable.json", "title": "Cursor CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/cursor-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/deepseek-harness-vs-letta.json", "title": "DeepSeek Harness (dsh) vs Letta", "url": "https://www.anchorterminal.com/compare/deepseek-harness-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/deepseek-harness-vs-unstoppable.json", "title": "DeepSeek Harness (dsh) vs Unstoppable", "url": "https://www.anchorterminal.com/compare/deepseek-harness-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta.json", "title": "dsh-superagent (DeepSeek) vs Letta", "url": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-unstoppable.json", "title": "dsh-superagent (DeepSeek) vs Unstoppable", "url": "https://www.anchorterminal.com/compare/deepseek-superagent-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/devin-vs-letta.json", "title": "Devin vs Letta", "url": "https://www.anchorterminal.com/compare/devin-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/devin-vs-unstoppable.json", "title": "Devin vs Unstoppable", "url": "https://www.anchorterminal.com/compare/devin-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/droid-cli-vs-letta.json", "title": "Droid CLI vs Letta", "url": "https://www.anchorterminal.com/compare/droid-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/droid-cli-vs-unstoppable.json", "title": "Droid CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/droid-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/earendil-pi-vs-letta.json", "title": "Pi vs Letta", "url": "https://www.anchorterminal.com/compare/earendil-pi-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/earendil-pi-vs-unstoppable.json", "title": "Pi vs Unstoppable", "url": "https://www.anchorterminal.com/compare/earendil-pi-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/emdash-vs-letta.json", "title": "Emdash vs Letta", "url": "https://www.anchorterminal.com/compare/emdash-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/emdash-vs-unstoppable.json", "title": "Emdash vs Unstoppable", "url": "https://www.anchorterminal.com/compare/emdash-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/gemini-cli-vs-letta.json", "title": "Gemini CLI vs Letta", "url": "https://www.anchorterminal.com/compare/gemini-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/gemini-cli-vs-unstoppable.json", "title": "Gemini CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/gemini-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta.json", "title": "GitHub Copilot CLI vs Letta", "url": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-unstoppable.json", "title": "GitHub Copilot CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/github-copilot-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/goose-vs-letta.json", "title": "goose vs Letta", "url": "https://www.anchorterminal.com/compare/goose-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/goose-vs-unstoppable.json", "title": "goose vs Unstoppable", "url": "https://www.anchorterminal.com/compare/goose-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/harness2-vs-letta.json", "title": "Harness² vs Letta", "url": "https://www.anchorterminal.com/compare/harness2-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harness2-vs-unstoppable.json", "title": "Harness² vs Unstoppable", "url": "https://www.anchorterminal.com/compare/harness2-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/harnessrouter-vs-letta.json", "title": "HarnessRouter vs Letta", "url": "https://www.anchorterminal.com/compare/harnessrouter-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harnessrouter-vs-unstoppable.json", "title": "HarnessRouter vs Unstoppable", "url": "https://www.anchorterminal.com/compare/harnessrouter-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-letta.json", "title": "Jules vs Letta", "url": "https://www.anchorterminal.com/compare/jules-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/jules-vs-unstoppable.json", "title": "Jules vs Unstoppable", "url": "https://www.anchorterminal.com/compare/jules-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/junie-vs-letta.json", "title": "Junie CLI vs Letta", "url": "https://www.anchorterminal.com/compare/junie-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/junie-vs-unstoppable.json", "title": "Junie CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/junie-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta.json", "title": "Kilo Code CLI vs Letta", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-unstoppable.json", "title": "Kilo Code CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/kilo-code-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta.json", "title": "Kimi Code CLI vs Letta", "url": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-unstoppable.json", "title": "Kimi Code CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/kimi-code-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/kiro-cli-vs-letta.json", "title": "Kiro CLI vs Letta", "url": "https://www.anchorterminal.com/compare/kiro-cli-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/kiro-cli-vs-unstoppable.json", "title": "Kiro CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/kiro-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-mini-swe-agent.json", "title": "Letta vs mini-swe-agent", "url": "https://www.anchorterminal.com/compare/letta-vs-mini-swe-agent" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-minimax-code.json", "title": "Letta vs MiniMax Code", "url": "https://www.anchorterminal.com/compare/letta-vs-minimax-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-mistral-vibe-cli.json", "title": "Letta vs Mistral Vibe CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-mistral-vibe-cli" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-muse-code.json", "title": "Letta vs Muse Code", "url": "https://www.anchorterminal.com/compare/letta-vs-muse-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openai-agents-api.json", "title": "Letta vs OpenAI Agents API", "url": "https://www.anchorterminal.com/compare/letta-vs-openai-agents-api" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openai-codex.json", "title": "Letta vs OpenAI Codex", "url": "https://www.anchorterminal.com/compare/letta-vs-openai-codex" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-opencode.json", "title": "Letta vs OpenCode", "url": "https://www.anchorterminal.com/compare/letta-vs-opencode" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openhands.json", "title": "Letta vs OpenHands", "url": "https://www.anchorterminal.com/compare/letta-vs-openhands" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-openmausbot.json", "title": "Letta vs OpenMausBot", "url": "https://www.anchorterminal.com/compare/letta-vs-openmausbot" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-orca.json", "title": "Letta vs Orca", "url": "https://www.anchorterminal.com/compare/letta-vs-orca" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-paseo.json", "title": "Letta vs Paseo", "url": "https://www.anchorterminal.com/compare/letta-vs-paseo" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-prime-agent.json", "title": "Letta vs Prime Agent", "url": "https://www.anchorterminal.com/compare/letta-vs-prime-agent" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-qoder-cli.json", "title": "Letta vs Qoder CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-qoder-cli" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-qwen-code.json", "title": "Letta vs Qwen Code", "url": "https://www.anchorterminal.com/compare/letta-vs-qwen-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-reflection-mirror.json", "title": "Letta vs Mirror CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-reflection-mirror" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli.json", "title": "Letta vs Rovo Dev CLI", "url": "https://www.anchorterminal.com/compare/letta-vs-rovo-dev-cli" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-sculptor.json", "title": "Letta vs Sculptor", "url": "https://www.anchorterminal.com/compare/letta-vs-sculptor" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-t3-code.json", "title": "Letta vs T3 Code", "url": "https://www.anchorterminal.com/compare/letta-vs-t3-code" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-traycer.json", "title": "Letta vs Traycer", "url": "https://www.anchorterminal.com/compare/letta-vs-traycer" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-verdent.json", "title": "Letta vs Verdent", "url": "https://www.anchorterminal.com/compare/letta-vs-verdent" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading.json", "title": "Letta vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/letta-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-warp.json", "title": "Letta vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/letta-vs-warp" }, { "json": "https://www.anchorterminal.com/compare/mini-swe-agent-vs-unstoppable.json", "title": "mini-swe-agent vs Unstoppable", "url": "https://www.anchorterminal.com/compare/mini-swe-agent-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/minimax-code-vs-unstoppable.json", "title": "MiniMax Code vs Unstoppable", "url": "https://www.anchorterminal.com/compare/minimax-code-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-unstoppable.json", "title": "Mistral Vibe CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/muse-code-vs-unstoppable.json", "title": "Muse Code vs Unstoppable", "url": "https://www.anchorterminal.com/compare/muse-code-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable.json", "title": "OpenAI Agents API vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openai-agents-api-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/openai-codex-vs-unstoppable.json", "title": "OpenAI Codex vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openai-codex-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/opencode-vs-unstoppable.json", "title": "OpenCode vs Unstoppable", "url": "https://www.anchorterminal.com/compare/opencode-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/openhands-vs-unstoppable.json", "title": "OpenHands vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openhands-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/orca-vs-unstoppable.json", "title": "Orca vs Unstoppable", "url": "https://www.anchorterminal.com/compare/orca-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/paseo-vs-unstoppable.json", "title": "Paseo vs Unstoppable", "url": "https://www.anchorterminal.com/compare/paseo-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/prime-agent-vs-unstoppable.json", "title": "Prime Agent vs Unstoppable", "url": "https://www.anchorterminal.com/compare/prime-agent-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/qoder-cli-vs-unstoppable.json", "title": "Qoder CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/qoder-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/qwen-code-vs-unstoppable.json", "title": "Qwen Code vs Unstoppable", "url": "https://www.anchorterminal.com/compare/qwen-code-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/reflection-mirror-vs-unstoppable.json", "title": "Mirror CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/reflection-mirror-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/rovo-dev-cli-vs-unstoppable.json", "title": "Rovo Dev CLI vs Unstoppable", "url": "https://www.anchorterminal.com/compare/rovo-dev-cli-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/sculptor-vs-unstoppable.json", "title": "Sculptor vs Unstoppable", "url": "https://www.anchorterminal.com/compare/sculptor-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/t3-code-vs-unstoppable.json", "title": "T3 Code vs Unstoppable", "url": "https://www.anchorterminal.com/compare/t3-code-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/traycer-vs-unstoppable.json", "title": "Traycer vs Unstoppable", "url": "https://www.anchorterminal.com/compare/traycer-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-letta.json", "title": "Clawboo vs Letta", "url": "https://www.anchorterminal.com/compare/clawboo-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/clawboo-vs-unstoppable.json", "title": "Clawboo vs Unstoppable", "url": "https://www.anchorterminal.com/compare/clawboo-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-letta.json", "title": "CLI Manager vs Letta", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/cli-manager-vs-unstoppable.json", "title": "CLI Manager vs Unstoppable", "url": "https://www.anchorterminal.com/compare/cli-manager-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.json", "title": "Harness vs Letta", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-letta" }, { "json": "https://www.anchorterminal.com/compare/harness-autonomous-vs-unstoppable.json", "title": "Harness vs Unstoppable", "url": "https://www.anchorterminal.com/compare/harness-autonomous-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-paperclip.json", "title": "Letta vs Paperclip", "url": "https://www.anchorterminal.com/compare/letta-vs-paperclip" }, { "json": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents.json", "title": "Letta vs Parallax", "url": "https://www.anchorterminal.com/compare/letta-vs-parallax-agents" }, { "json": "https://www.anchorterminal.com/compare/openmausbot-vs-unstoppable.json", "title": "OpenMausBot vs Unstoppable", "url": "https://www.anchorterminal.com/compare/openmausbot-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/paperclip-vs-unstoppable.json", "title": "Paperclip vs Unstoppable", "url": "https://www.anchorterminal.com/compare/paperclip-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable.json", "title": "Parallax vs Unstoppable", "url": "https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable" }, { "json": "https://www.anchorterminal.com/compare/unstoppable-vs-verdent.json", "title": "Unstoppable vs Verdent", "url": "https://www.anchorterminal.com/compare/unstoppable-vs-verdent" }, { "json": "https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading.json", "title": "Unstoppable vs Vibe-Trading", "url": "https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading" }, { "json": "https://www.anchorterminal.com/compare/unstoppable-vs-warp.json", "title": "Unstoppable vs Warp (Warp Agent CLI and the Oz Agent API)", "url": "https://www.anchorterminal.com/compare/unstoppable-vs-warp" } ], "panel": null, "scores": [ { "by": 13, "edge": "letta", "key": "reliability", "letta": 58, "name": "Reliability", "unstoppable": 45, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 40, "edge": "letta", "key": "schema", "letta": 70, "name": "Schema \u0026 documentation", "unstoppable": 30, "weight": 13 }, { "by": 62, "edge": "letta", "key": "ergonomics", "letta": 67, "name": "Agent ergonomics", "unstoppable": 5, "weight": 13 }, { "by": 1, "edge": "unstoppable", "key": "security", "letta": 35, "name": "Security \u0026 auth", "unstoppable": 36, "weight": 14 }, { "by": 30, "edge": "letta", "key": "payments", "letta": 60, "name": "Payments \u0026 pricing", "unstoppable": 30, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 27, "edge": "letta", "key": "maintenance", "letta": 85, "name": "Maintenance \u0026 community", "unstoppable": 58, "weight": 7 }, { "by": 1, "edge": "unstoppable", "key": "transparency", "letta": 55, "name": "Transparency \u0026 trust", "unstoppable": 56, "weight": 7 } ], "summary": "Letta scores 59.7 (C) on agent readiness against Unstoppable's 34.7 (F), and leads in 5 of 7 scored categories. Both do agent harnesses.", "tasks": null, "tutorials": [], "verdicts": { "letta": "Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.", "unstoppable": "Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/letta-vs-unstoppable", "json": "https://www.anchorterminal.com/compare/letta-vs-unstoppable.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/letta-vs-unstoppable.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/letta-vs-unstoppable.min.md" }, "markdown": "Letta scores 59.7 (C) on agent readiness against Unstoppable's 34.7 (F), and leads in 5 of 7 scored categories. Both do agent harnesses.\n\n- Letta: grade C, 59.7/100, rank #687 of 1510. Markdown https://www.anchorterminal.com/tools/letta.md · JSON https://www.anchorterminal.com/api/v1/tools/letta.json\n- Unstoppable: grade F, 34.7/100, rank #1400 of 1510. Markdown https://www.anchorterminal.com/tools/unstoppable.md · JSON https://www.anchorterminal.com/api/v1/tools/unstoppable.json\n- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md\n- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md\n- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md\n- All 353 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md\n\n## Which one, for what\n\n### Letta (C)\n\nGood for: Long-lived coding agents and assistants that keep memory and identity across sessions and machines.\n\nAhead on:\n- Reliability, 58 against 45\n- Schema \u0026 documentation, 70 against 30\n- Agent ergonomics, 67 against 5\n- Payments \u0026 pricing, 60 against 30\n- Maintenance \u0026 community, 85 against 58\n\nAlso in its favour:\n- Runs on your own machine\n- Open source\n\nWatch for: The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode\n\n### Unstoppable (F)\n\nGood for: A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.\n\nAlso in its favour:\n- No key needed to call it\n- Free to start without a card\n\nWatch for: No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines\n\n\n## Why the edge\n\n### Agent ergonomics: Letta +62\n\n- Letta (67): Harness reading. Toolsets switch with `/model`, skills load per agent, and subagents run in the background (18 of 25). Context is managed through memory blocks, reflection and dreaming (12 of 20). `letta -p --output-format json` for scripted runs and an App Server for programmatic control (12 of 20). Conversations resume by agent and conversation id, and memory is git-tracked so changes can be reverted (15 of 20). Runs with no account on the local backend, with one SDK language, TypeScript (10 of 15). Total 67.\n- Unstoppable (5): These lines measure an interface an agent calls, and Unstoppable has none, so context cost, output controls and retries score nothing. For the person, a usage limit shows choices to wait for the reset or continue on credits (2 of 20). Guest use with no account, a first-run page that imports Claude and Codex projects, and few required settings. No SDK (3 of 15). Total 5.\n\n### Schema \u0026 documentation: Letta +40\n\n- Letta (70): Harness reading. docs.letta.com serves llms.txt and a Markdown version of every page, with an `applies_to` block saying which backend and interface each page covers (10). TypeScript types for the Agent SDK and a documented App Server WebSocket protocol, but no JSON Schema or OpenAPI for the harness (15 of 25). Pages say when to use local or cloud backends, subagents and channels (14 of 20). Permission modes and options are typed in the SDK (12 of 15). Example applications and a remote client reference (11 of 15). Releases most days but no changelog file (8 of 15). Total 70.\n- Unstoppable (30): Graded on the interface an outside agent can use, which is none. No API, OpenAPI file, MCP server or documented command (0). unstoppable.ai/llms.txt lists the product, help and policy pages in Markdown (10). Twenty-two dated help articles explain for a person what each part does and when to use it, such as Code and Work modes and approval modes (5 of 20). No typed inputs an agent could call (0). Step-by-step examples for people and named error states such as usage limit reached and update failed, with no error responses for an agent (3 of 15). Numbered versions and a public dated changelog, which lists only four releases from 20 to 23 October 2026 (12 of 15). Total 30.\n\n### Payments \u0026 pricing: Letta +30\n\n- Letta (60): No x402, MPP or L402 (0 of 40). Per-unit API prices are public, $0.10 per active agent a month and $0.00015 a second of tool execution, plus plan prices (20). A $0 plan with bring-your-own keys; no card is mentioned (20). The CLI runs locally without signing in (20). Total 60.\n- Unstoppable (30): No x402, MPP or L402 (0). The app is published as free, but AI credit prices appear only after sign-in, and no pricing page exists (unstoppable.ai/pricing redirects to the home page). Plan prices of $19, $29 and $49 appear only in an 11 August 2026 blog post (10). Guest use with no account, and 10 free AI credits a day with no card (20). A person has to download and install the app, so no autonomous onboarding (0). Total 30.\n\n### Maintenance \u0026 community: Letta +27\n\n- Letta (85): v0.34.42 on 6 November 2026 (30). Dozens of releases in 90 days (20). Pull requests are merged daily; recent issues from users have few replies (15 of 25). npm and PyPI packages and the Agent SDK track the releases (12 of 15). Lock files, CI and nightly smoke tests (8 of 10). Total 85.\n- Unstoppable (58): Read for a closed product. Version 1.15.0 on 23 October 2026, and iOS 1.1.9 on 27 October (30). Four desktop releases from 20 to 23 October and nine iOS updates since 11 August 2026 (20). A public changelog, a support email, in-app feedback and a Discord server, none tested for replies. Help articles were updated between 19 and 24 October (6 of 15). No SDK and no MCP registry entry (0). Windows updates check signatures per the 1.13.0 notes, with no build pipeline to inspect (2 of 10). Total 58.\n\n### Reliability: Letta +13\n\n- Letta (58): Local-software lines, read for the harness. `@letta-ai/letta-code` on npm with Node.js 22.19 or newer, and PyPI wheels for glibc Linux, macOS 14 and Windows x64 with Python 3.9 or newer stated (20). ci.yml, nightly update smoke tests and Telegram live smoke tests exist, but GitHub's API answered with a rate limit, so run results were unread (15 of 25, unchecked). 332 open issues and pull requests, mostly pull requests; recent bug reports such as recall reading the wrong conversation have no reply yet (15 of 25). 398 tags at 0.34.x with release notes on GitHub, no changelog file, and breaking removals such as AgentFile announced in the README (8 of 15). Pre-1.0 (0). Total 58.\n- Unstoppable (45): Read as local software, because the product is the desktop app the owner runs, as for the other harnesses. Signed downloads for macOS Apple Silicon, macOS Intel and Windows on the download page, version 1.15.0, plus iOS and Android apps in the stores, with the supported platforms stated. No package registry (20). Closed source with no public CI or test suite (0). No public issue tracker. Bugs go through in-app feedback, email and Discord, none of which shows a record we could read (0). Version numbers and a dated changelog, but only 1.12.0 to 1.15.0 are listed and breaking changes are not marked as such (10). Version 1.15.0 (15). The hosted parts (accounts, AI credits, cloud agents, Remote Control) have no status page. status.unstoppabledomains.com covers the domains business only.\n\n## Score by category\n\n| Category | Weight | Letta | Unstoppable | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 58 | 45 | Letta +13 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 70 | 30 | Letta +40 |\n| Agent ergonomics | 13% (16.2 this run) | 67 | 5 | Letta +62 |\n| Security \u0026 auth | 14% (17.5 this run) | 35 | 36 | Unstoppable +1 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 30 | Letta +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 85 | 58 | Letta +27 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 55 | 56 | Unstoppable +1 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **59.7 · C** | **34.7 · F** | |\n\n## Facts side by side\n\n| Fact | Letta | Unstoppable |\n| --- | --- | --- |\n| Kind | Agent harness | Agent harness |\n| Vendor | Letta | Unstoppable Domains, Inc. |\n| Hosted endpoint | no (local only) | no (local only) |\n| Transports | stdio | |\n| Auth | OAuth or key | None |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-11-06 | 2026-10-23 |\n| Terms last updated | no date given | 2026-10-06 |\n| Privacy policy last updated | no date given | 2026-10-08 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | yes |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk | none |\n\n## How the scores have moved\n\n### Letta\n\nNo score change since it was listed.\n\n### Unstoppable\n\n- -0.2 on 30 October 2026: checklist\n\n## Verdicts\n\n**Letta.** Letta's open-source harness gives agents git-tracked memory blocks, skills, subagents and headless JSON runs, with a $0 plan and public per-agent API prices. It starts in the unrestricted permission mode, defaults to Letta Cloud, sends usage telemetry unless LETTA_CODE_TELEM=0 is set, and the V1 API server the comparisons describe is retired.\n\n**Unstoppable.** Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.\n\n## Before you call either\n\n### Letta\n\n1. Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools\n2. Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default\n3. Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent\n4. Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output\n5. Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone\n\n### Unstoppable\n\n1. Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them\n2. Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals\n3. When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits\n4. Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch\n\n## Questions\n\n### Which is better for AI agents, Letta or Unstoppable?\n\nLetta scores 59.7 (C) on agent readiness against Unstoppable's 34.7 (F), and leads in 5 of 7 scored categories.\n\n### Are Letta and Unstoppable open source?\n\nLetta is open source (Apache-2.0). No open-source release is listed for Unstoppable.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/letta-vs-unstoppable.json, and with the fewest tokens: https://www.anchorterminal.com/compare/letta-vs-unstoppable.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"letta\", \"b\": \"unstoppable\"}`. From a terminal: `anchor compare letta unstoppable`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/letta.json and https://www.anchorterminal.com/api/v1/tools/unstoppable.json\n\n## Other comparisons with Letta or Unstoppable\n\n- [Agent Zero vs Letta](https://www.anchorterminal.com/compare/agent-zero-vs-letta.md)\n- [Agent Zero vs Unstoppable](https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.md)\n- [Aider vs Letta](https://www.anchorterminal.com/compare/aider-vs-letta.md)\n- [Aider vs Unstoppable](https://www.anchorterminal.com/compare/aider-vs-unstoppable.md)\n- [Amp vs Letta](https://www.anchorterminal.com/compare/amp-vs-letta.md)\n- [Amp vs Unstoppable](https://www.anchorterminal.com/compare/amp-vs-unstoppable.md)\n- [Antigravity CLI vs Letta](https://www.anchorterminal.com/compare/antigravity-cli-vs-letta.md)\n- [Antigravity CLI vs Unstoppable](https://www.anchorterminal.com/compare/antigravity-cli-vs-unstoppable.md)\n- [Auggie CLI vs Letta](https://www.anchorterminal.com/compare/auggie-vs-letta.md)\n- [Auggie CLI vs Unstoppable](https://www.anchorterminal.com/compare/auggie-vs-unstoppable.md)\n- [AXLR vs Letta](https://www.anchorterminal.com/compare/axlr-vs-letta.md)\n- [AXLR vs Unstoppable](https://www.anchorterminal.com/compare/axlr-vs-unstoppable.md)\n- [Claude Code vs Letta](https://www.anchorterminal.com/compare/claude-code-vs-letta.md)\n- [Claude Code vs Unstoppable](https://www.anchorterminal.com/compare/claude-code-vs-unstoppable.md)\n- [Cline vs Letta](https://www.anchorterminal.com/compare/cline-vs-letta.md)\n- [Cline vs Unstoppable](https://www.anchorterminal.com/compare/cline-vs-unstoppable.md)\n- [Conductor vs Letta](https://www.anchorterminal.com/compare/conductor-vs-letta.md)\n- [Conductor vs Unstoppable](https://www.anchorterminal.com/compare/conductor-vs-unstoppable.md)\n- [Crush vs Letta](https://www.anchorterminal.com/compare/crush-vs-letta.md)\n- [Crush vs 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Unstoppable](https://www.anchorterminal.com/compare/rovo-dev-cli-vs-unstoppable.md)\n- [Sculptor vs Unstoppable](https://www.anchorterminal.com/compare/sculptor-vs-unstoppable.md)\n- [T3 Code vs Unstoppable](https://www.anchorterminal.com/compare/t3-code-vs-unstoppable.md)\n- [Traycer vs Unstoppable](https://www.anchorterminal.com/compare/traycer-vs-unstoppable.md)\n- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)\n- [Clawboo vs Unstoppable](https://www.anchorterminal.com/compare/clawboo-vs-unstoppable.md)\n- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)\n- [CLI Manager vs Unstoppable](https://www.anchorterminal.com/compare/cli-manager-vs-unstoppable.md)\n- [Harness vs Letta](https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.md)\n- [Harness vs Unstoppable](https://www.anchorterminal.com/compare/harness-autonomous-vs-unstoppable.md)\n- [Letta vs Paperclip](https://www.anchorterminal.com/compare/letta-vs-paperclip.md)\n- [Letta vs Parallax](https://www.anchorterminal.com/compare/letta-vs-parallax-agents.md)\n- [OpenMausBot vs Unstoppable](https://www.anchorterminal.com/compare/openmausbot-vs-unstoppable.md)\n- [Paperclip vs Unstoppable](https://www.anchorterminal.com/compare/paperclip-vs-unstoppable.md)\n- [Parallax vs Unstoppable](https://www.anchorterminal.com/compare/parallax-agents-vs-unstoppable.md)\n- [Unstoppable vs Verdent](https://www.anchorterminal.com/compare/unstoppable-vs-verdent.md)\n- [Unstoppable vs Vibe-Trading](https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading.md)\n- [Unstoppable vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/unstoppable-vs-warp.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from 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