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LangChain vs Letta
A factual side-by-side comparison of LangChain and Letta. We compare pricing, categories, free tiers and official websites — no invented scores.
Updated 2026-10-22
Quick take
Both LangChain and Letta are Freemium. Pick the one whose tagline and categories match your use case, then check the alternatives below.
Stateful agents with long-term memory, from MemGPT
AI FrameworksAgent Building
Visit website| Pricing | Freemium | Freemium |
|---|---|---|
| Categories | Agent Building / AI Dev Platforms | AI Frameworks / Agent Building |
| Best for | The most popular LLM app framework | Stateful agents with long-term memory, from MemGPT |
| Free tier | Yes — free or freemium | Yes — free or freemium |
| Website | www.langchain.com | www.letta.com |