# Emdash vs Letta (slim)

> Letta scores 59.7 (C) to Emdash's 53.9 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/emdash-vs-letta.md (~4,450 tokens) · this version ~1,130 tokens · JSON https://www.anchorterminal.com/compare/emdash-vs-letta.json · canonical https://www.anchorterminal.com/compare/emdash-vs-letta
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Letta scores 59.7 (C) on agent readiness against Emdash's 53.9 (D), and leads in 5 of 7 scored categories. Both do agent harnesses.

- Emdash: D 53.9, rank #933 of 1510 · https://www.anchorterminal.com/tools/emdash.min.md
- Letta: C 59.7, rank #687 of 1510 · https://www.anchorterminal.com/tools/letta.min.md
- Emdash, good for Developers who want parallel agents in worktrees, fed from their issue tracker, locally or over SSH. Also No key needed to call it.
- Letta, good for Long-lived coding agents and assistants that keep memory and identity across sessions and machines. Ahead on Schema & documentation, 70 against 55; Agent ergonomics, 67 against 55; Maintenance & community, 85 against 70. Also Runs on your own machine.

| Category | Emdash | Letta |
| --- | --- | --- |
| Reliability (16%) | 55 | 58 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 55 | 70 |
| Agent ergonomics (13%) | 55 | 67 |
| Security & auth (14%) | 38 | 35 |
| Payments & pricing (10%) | 60 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 70 | 85 |
| Transparency & trust (7%) | 54 | 55 |

| Fact (where they differ) | Emdash | Letta |
| --- | --- | --- |
| Vendor | General Action, Inc. | Letta |
| Transports |  | stdio |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| llms.txt | no | yes |
| Terms last updated | no document linked | no date given |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models | not read yet | not found in the text |
| Terms restrict automated access | not read yet | not found in the text |
| Terms restrict benchmarking | not read yet | not found in the text |
| Terms or service can change without notice | not read yet | not found in the text |
| Arbitration or class-action waiver | not read yet | yes |
| Popularity | none | 3.8k stars, 86k npm/wk, 2.2k PyPI/wk |

Why the edge:
- Schema & documentation, Letta +15: Emdash 55 (Harness reading. Docs site and a workspace server package (55).); 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 +15: Emdash 70 (v1.2.11 on 6 November 2026 (30). v1.2.9, v1.2.10 and v1.2.11 within two weeks (20). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). Current installers and Homebrew cask (15). Release workflows, no test CI (5). 30 + 20 + 0 + 15 + 5 = 70.); 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, Letta +12: Emdash 55 (Harness reading. Issue intake from Linear, GitHub, Jira and others, diff review, pull requests and CI checks in one place, local or over SSH (55).); 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.)