head to head · open source
claude-mem vs Letta
claude-mem has 94,125 GitHub stars, 8,305 forks, 186 open issues and last shipped yesterday. Letta has 3,366 stars, 411 forks, 347 open issues and last shipped yesterday. claude-mem leads on adoption by 2,696% (94,125 vs 3,366 stars). claude-mem is written in TypeScript under Apache-2.0; Letta is written in TypeScript under Apache-2.0. claude-mem has attracted 9% as many forks as stars, Letta 12%. Letta was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, claude), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| claude-mem | Letta | |
|---|---|---|
| GitHub stars | ★ 94K | ★ 3.4K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 8.3K | ⑂ 411 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick claude-mem if
- You weight community size — 94K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Letta if
- You want the Letta feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and Letta fits your workflow better
About claude-mem
claude mem is an Apache 2.0 TypeScript memory layer for AI coding agents that captures what an agent did during a session, compresses it with AI, and injects the relevant parts back into future sessions, built for developers running Claude Code, OpenClaw, Codex, Gemini, Hermes, Copilot, OpenCode and similar tools.
read the full claude-mem overview →
About Letta
Letta Code is an open source TypeScript harness under Apache 2.0 for stateful AI agents. It lives in the AI & Machine Learning / AI Development Platforms ecosystem. It gives agents memory, identity, and a sense of experience over time. It targets agents that behave more like people than tools.
read the full Letta overview →
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Frequently asked questions
Is claude-mem or Letta more popular?
claude-mem has 94,125 GitHub stars and Letta has 3,366. claude-mem has the larger community by that measure.
Are claude-mem and Letta free?
Both are open source. claude-mem is licensed under Apache-2.0 and Letta under Apache-2.0. Neither carries a licence fee.
What is the difference between claude-mem and Letta?
claude-mem is written in TypeScript and Letta in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, claude-mem or Letta?
Choose claude-mem if you want the larger community (94,125 stars) or its Apache-2.0 licence terms. Choose Letta if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.