# Droid CLI vs Letta

> Letta scores 59.7 (C) to Droid CLI's 57.2 (C) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/droid-cli-vs-letta
- Markdown: https://www.anchorterminal.com/compare/droid-cli-vs-letta.md (~6,750 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Letta scores 59.7 (C) on agent readiness against Droid CLI's 57.2 (C), and leads in 3 of 7 scored categories. Droid CLI leads on schema & documentation, agent ergonomics, security & auth and transparency & trust. Both do agent harnesses.

- Droid CLI: grade C, 57.2/100, rank #809 of 1510. Markdown https://www.anchorterminal.com/tools/droid-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/droid-cli.json
- 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
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md
- Best memory layers for AI agents: https://www.anchorterminal.com/best/agent-memory/index.md
- All 353 memory comparisons: https://www.anchorterminal.com/compare/agent-memory/index.md

## Which one, for what

### Droid CLI (C)

Good for: Teams that want a terminal coding agent with tiered autonomy, command rules and an optional sandbox, and that will pay for a Factory plan.

Ahead on:
- Schema & documentation, 79 against 70
- Agent ergonomics, 72 against 67
- Security & auth, 63 against 35
- Transparency & trust, 65 against 55

Watch for: No free tier or trial was found. Plans start at $20 a month and included usage is stated only as rolling rate limits without numbers

### Letta (C)

Good for: Long-lived coding agents and assistants that keep memory and identity across sessions and machines.

Ahead on:
- Payments & pricing, 60 against 10
- Maintenance & community, 85 against 79

Also in its favour:
- Runs on your own machine
- Open source
- No incidents deducted, where Droid CLI loses 3 points for them

Watch for: The default permission mode is `unrestricted`, the renamed `bypassPermissions`, so tool calls aren't confirmed unless the user picks another mode


## Why the edge

### Payments & pricing: Letta +50

- Droid CLI (10): Harness reading of the published rubric. This is paid, closed software tied to a subscription, so the self-hosted rule does not apply. No payment protocol (0). Plan prices are public, $20, $100 and $200 a month for individuals and $60 a team plus $40 a seat for Teams, but included usage is given only as rolling rate limits and multiples of Pro (10). No free tier or trial was found on the pricing pages. Using your own model key is free up to an allowance, but only on a paid plan (0). A person signs in through a browser to subscribe and to create the API key. The Service Accounts API can issue keys only inside an existing organisation (0).
- 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.

### Security & auth: Droid CLI +28

- Droid CLI (63): Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. The agent loop runs locally and the docs say no copy of the repository is uploaded or indexed. Prompts and context go to the model endpoints. Usage metrics go to Factory's collector by default, with no opt-out in the pages read outside an airgapped deployment, and message content is never sent to it. The security page says code is not used as training data. Zero data retention is listed as a Business plan item. Headless runs use a long-lived `fk-` key (17). `droid exec` is read-only by default, autonomy has four levels, permission rules allow, ask or block commands, and an OS sandbox confines commands with Seatbelt or bubblewrap and a network proxy. The sandbox is off by default and `--skip-permissions-unsafe` skips every prompt (16). The sandbox page names prompt injection and states what the sandbox does not stop, MCP approvals are bound to the server's command or URL, and Droid Shield scans commits for secrets. The Agent Safety page was not read (9). An organisation audit log, OpenTelemetry export and session tags exist, with audit logging listed from the Business plan up (10). A disclosure address (security@factory.com), SOC 2 and ISO 42001 named on the security page, per the 9 October check, and Security sections in the changelog. No security.txt (404 on 4 November), no bug bounty and no published advisories were found, OSV holds nothing for `droid`, and the trust centre was not readable (11).
- Letta (35): Harness reading of the framework checklist, as for the other harnesses. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for injection posture, 15 for audit and 20 for the security programme. Letta Cloud is the default backend, so agent state and conversations go to Letta's servers, and telemetry is on by default (10 of 30). The default permission mode is `unrestricted`; `standard`, `acceptEdits` and `strict` are opt-in, and cloud sandboxes exist for remote work (4 of 20). No prompt-injection guidance found for fetched pages or channel messages (5 of 15). Conversation search and git history of memory give an operator a record of what the agent saw and changed (10 of 15). SECURITY.md routes reports to support@letta.com and scopes out the retired server; no security.txt, bounty or certification found (6 of 20). Total 35.

### Transparency & trust: Droid CLI +10

- Droid CLI (65): Closed source under terms from The San Francisco AI Factory, Inc., last updated 14 July 2026. The npm package is marked `UNLICENSED` and the Python SDK is Apache-2.0 (15). The Data Flows page says where code, prompts and telemetry go in each deployment pattern, and the privacy policy (20 August 2026) lists service providers with the place of processing and keeps personal data up to 10 years after last use. Retention of Factory's operational logs is left to the trust centre, which we could not read, and whether session transcripts are stored in Factory's cloud on individual plans was not established (17). The terms promise commercially reasonable efforts to give 60 days' notice of major changes, the changelog has Deprecations sections, and the old command lists are deprecated but still honoured. A model retirement appeared in the changelog on the day it took effect, 11 August 2026 (12). The telemetry reference documents each metric and what reaches Factory, and `telemetry.granularity` can strip user identity. Metrics to Factory are on by default, with no opt-out found outside an airgapped deployment (11).
- Letta (55): Apache-2.0 (30). The privacy policy has no date, no legal entity and no retention periods, and says hosted message data may train future models (8 of 30). The README and docs mark AgentFile, the Electron app and the V1 server as deprecated or retired, without dated notice periods (12 of 20). Telemetry is described in the privacy policy only as basic and opt-out when supported; the LETTA_CODE_TELEM=0 switch appears only in the source (5 of 20). Total 55.

### Schema & documentation: Droid CLI +9

- Droid CLI (79): Framework reading. The docs index links an OpenAPI file for the Factory public API, which we did not open, and the headless mode has a documented JSON-RPC surface with named methods. `droid exec --list-tools --output-format json` and `droid rules check --json` give machine-readable output. We found no published schema for the settings file (15). docs.factory.com/llms.txt lists a Markdown copy of every page (10). The overview says when to use the CLI, and the autonomy table says what each level allows, blocks and suits (16). Autonomy levels, output formats, sandbox modes and MCP server fields are enumerated with types and defaults (12). Examples on every page read, exit codes 0, 1 and 2, and a JSON result with `is_error` and `subtype`, with no error catalogue (11). A changelog by CLI version with dates and an RSS feed, 236 entries back to 30 September 2025 (15).
- 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.

### Maintenance & community: Letta +6

- Droid CLI (79): The changelog's newest entry is CLI v1.3.0 of 4 November 2026 (30). 67 dated changelog entries between 6 August and 4 November 2026, 20 of them after 9 October (20). The public tracker had 33 open issues that are not pull requests on 9 October 2026, most with no reply, and three closed in the previous week after two or three comments, not re-read on 4 November. Support is also by email and Discord, where reply times are not visible (9). The TypeScript SDK repository moved to 0.10.0 with examples tested in CI on 20 October 2026, and the Python SDK is at 0.5.0 of 24 September 2026 (15). The npm package is published from GitHub Actions through a trusted publisher and the installer checks a checksum, per the 9 October check. There is no public CI for the CLI (5).
- 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.

### Agent ergonomics: Droid CLI +5

- Droid CLI (72): Harness reading of the framework line. `--restrict-tools`, `--disabled-tools`, `--additional-tools` and `--list-tools` control built-in tools per run, and `disabledTools` in `mcp.json` keeps named MCP tools out of context. We found nothing on deferred tool loading (18). Output is text, json, stream-json or stream-jsonrpc, and the JSON result carries turns and duration. The `droid exec` help lists no flag for a turn or spend limit (10). Exit codes 0, 1 and 2 are documented, and a run that exceeds its autonomy level stops with a non-zero code and no partial changes, per the docs (15). `--session-id` continues a session, `--fork` branches one, and `--worktree` isolates parallel runs (16). Headless runs are read-only without flags, and TypeScript and Python SDKs wrap the CLI. A run needs a paid Factory account and an API key (13).
- 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.

## Score by category

| Category | Weight | Droid CLI | Letta | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 54 | 58 | Letta +4 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 79 | 70 | Droid CLI +9 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 67 | Droid CLI +5 |
| Security & auth | 14% (17.5 this run) | 63 | 35 | Droid CLI +28 |
| Payments & pricing | 10% (12.5 this run) | 10 | 60 | Letta +50 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 79 | 85 | Letta +6 |
| Transparency & trust | 7% (8.8 this run) | 65 | 55 | Droid CLI +10 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **57.2 · C** | **59.7 · C** | |

## Facts side by side

| Fact | Droid CLI | Letta |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Factory | Letta |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  | stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary, under Factory's Terms and Conditions. The `droid` npm package is marked `UNLICENSED` and the public repository holds documentation only. The Python SDK is Apache-2.0 | Apache-2.0 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-11-04 | 2026-11-06 |
| Terms last updated | 2026-07-14 | no date given |
| Privacy policy last updated | 2026-08-20 | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 49 stars, 7.8k npm/wk | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk |

## How the scores have moved

### Droid CLI

- -2.0 on 4 November 2026: security, product
- +0.1 on 28 October 2026: checklist

### Letta

No score change since it was listed.

## Verdicts

**Droid CLI.** `droid exec` is read-only unless `--auto` raises the autonomy level, with command rules, an optional kernel-enforced sandbox, JSON output and documented exit codes. No free tier, status page or security.txt was found, the source is closed, usage metrics go to Factory by default, and security fixes ship in release notes without advisories.

**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.

## Before you call either

### Droid CLI

1. Set `FACTORY_API_KEY` (starts `fk-`) from the API keys page in Factory settings for headless runs. Interactive use signs in through a browser
2. Start with `droid exec` and no flags for analysis. Add `--auto low` for edits and `--auto medium` for installs, tests and local commits
3. Use `--output-format json` and read `is_error`, `num_turns` and `session_id`. Treat a non-zero exit code as failure
4. Set `sandbox.enabled` to true before running on untrusted code. In `droid exec` a sandbox violation is denied without a prompt
5. Pin the version in CI with `npm install -g droid@<version>`, or set `FACTORY_DROID_AUTO_UPDATE_ENABLED=false` on standalone installs, which update themselves. Read each release's Security section before upgrading

### Letta

1. Start headless runs with an explicit permission mode such as `standard` or `strict`; the default auto-approves tools
2. Pass `--backend local` for work that must stay on the machine, since Letta Cloud is the default
3. Set LETTA_CODE_TELEM=0 in unattended runs if usage events must not be sent
4. Use `letta -p --output-format json` for scripted runs and parse the JSON, not the terminal output
5. Don't plan on the retired V1 REST server or `.af` AgentFile import; both are gone

## Questions

### Which is better for AI agents, Droid CLI or Letta?

Letta scores 59.7 (C) on agent readiness against Droid CLI's 57.2 (C), and leads in 3 of 7 scored categories. Droid CLI leads on schema & documentation, agent ergonomics, security & auth and transparency & trust.

### Are Droid CLI and Letta open source?

No open-source release is listed for Droid CLI. Letta is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/droid-cli-vs-letta.json, and with the fewest tokens: https://www.anchorterminal.com/compare/droid-cli-vs-letta.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "droid-cli", "b": "letta"}`. From a terminal: `anchor compare droid-cli letta`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/droid-cli.json and https://www.anchorterminal.com/api/v1/tools/letta.json

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- [Letta vs Traycer](https://www.anchorterminal.com/compare/letta-vs-traycer.md)
- [Letta vs Unstoppable](https://www.anchorterminal.com/compare/letta-vs-unstoppable.md)
- [Letta vs Verdent](https://www.anchorterminal.com/compare/letta-vs-verdent.md)
- [Letta vs Vibe-Trading](https://www.anchorterminal.com/compare/letta-vs-vibe-trading.md)
- [Letta vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/letta-vs-warp.md)
- [Clawboo vs Droid CLI](https://www.anchorterminal.com/compare/clawboo-vs-droid-cli.md)
- [Clawboo vs Letta](https://www.anchorterminal.com/compare/clawboo-vs-letta.md)
- [CLI Manager vs Droid CLI](https://www.anchorterminal.com/compare/cli-manager-vs-droid-cli.md)
- [CLI Manager vs Letta](https://www.anchorterminal.com/compare/cli-manager-vs-letta.md)
- [Droid CLI vs Harness](https://www.anchorterminal.com/compare/droid-cli-vs-harness-autonomous.md)
- [Droid CLI vs Paperclip](https://www.anchorterminal.com/compare/droid-cli-vs-paperclip.md)
- [Droid CLI vs Parallax](https://www.anchorterminal.com/compare/droid-cli-vs-parallax-agents.md)
- [Harness vs Letta](https://www.anchorterminal.com/compare/harness-autonomous-vs-letta.md)
- [Letta vs Paperclip](https://www.anchorterminal.com/compare/letta-vs-paperclip.md)
- [Letta vs Parallax](https://www.anchorterminal.com/compare/letta-vs-parallax-agents.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp