head to head · open source
Dify vs Letta
Dify has 160,186 GitHub stars, 25,328 forks, 1,067 open issues and last shipped yesterday. Letta has 3,758 stars, 464 forks, 347 open issues and last shipped yesterday. Dify leads on adoption by 4,163% (160,186 vs 3,758 stars). Dify is written in Python under a custom or non-standard licence; Letta is written in TypeScript under Apache-2.0. Dify has attracted 16% as many forks as stars, Letta 12%. Dify 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
| Dify | Letta | |
|---|---|---|
| GitHub stars | ★ 160K | ★ 3.8K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 25K | ⑂ 464 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Dify if
- You weight community size — 160K stars and counting
- You want the Custom / other license terms
- Your stack matches Python
- 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 Dify
Dify Cloud · Self hosting · Documentation · Dify edition overview Dify is an open source LLM app development platform. Its intuitive interface combines AI workflow, RAG pipeline, agent capabilities, model management, observability features (including Opik, Langfuse, and Arize Phoenix) and more, letting you quickly go from prototype to production. Here's a list of the core features: Quick start Before installing Dify, make sure your machine meets the following minimum system requirements: CPU = 2 Core RAM = 4 GiB The easiest way to start the Dify server is through Docker Compose. Before running Dify with the…
About Letta
Letta Code Letta Code is a stateful agent harness for creating agents that are more like people than tools. Letta Code agents have memory, identity, and a sense of experience over time. They learn and evolve over long horizons through rewriting their own memory, skills, prompts, and even the harness itself (through mods). Letta Code can be used interactively, or to power always on agents that work proactively. Interact with agents through: A local CLI The desktop app for macOS, Windows, and Linux Your browser, including mobile, at chat.letta.com Messaging integrations, including Telegram, Slack, Discord, and…
read the full Letta overview →
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Frequently asked questions
Is Dify or Letta more popular?
Dify has 160,186 GitHub stars and Letta has 3,758. Dify has the larger community by that measure.
Are Dify and Letta free?
Both are open source. Dify has no licence declared in this registry, and Letta is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Dify and Letta?
Dify is written in Python 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, Dify or Letta?
Choose Dify if you want the larger community (160,186 stars) or its Custom / other licence terms. Choose Letta if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.