head to head · open source
langchain vs Mem0
langchain has 146,538 GitHub stars, 24,504 forks, 492 open issues and last shipped yesterday. Mem0 has 65,505 stars, 7,683 forks, 742 open issues and last shipped yesterday. langchain leads on adoption by 124% (146,538 vs 65,505 stars). langchain is written in Python under MIT; Mem0 is written in Python under Apache-2.0. langchain has attracted 17% as many forks as stars, Mem0 12%. langchain was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (agents, ai, ai-agents, chatgpt), 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
| langchain | Mem0 | |
|---|---|---|
| GitHub stars | ★ 147K | ★ 66K |
| License | MIT | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 25K | ⑂ 7.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick langchain if
- You weight community size — 147K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Mem0 if
- You want the Mem0 feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and Mem0 fits your workflow better
About langchain
LangChain is an open source framework for building agents and LLM powered applications, written in Python and released under the MIT license. It lives in the AI and machine learning ecosystem, specifically among AI development platforms, and it works by chaining together interoperable components and third party integrations so that AI application development becomes simpler. The project describes itself as the agent engineering platform, and its abstractions are designed to keep applications working as the underlying technology evolves.
read the full langchain overview →
About Mem0
Mem0 is an open source memory layer for AI agents and applications, designed to store, retrieve, and manage persistent context across interactions. It lives in the Python based AI development ecosystem and provides infrastructure that enables agents and apps to remember user preferences, conversation history, and state over time—moving beyond ephemeral chat sessions toward truly adaptive systems.
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Frequently asked questions
Is langchain or Mem0 more popular?
langchain has 146,538 GitHub stars and Mem0 has 65,505. langchain has the larger community by that measure.
Are langchain and Mem0 free?
Both are open source. langchain is licensed under MIT and Mem0 under Apache-2.0. Neither carries a licence fee.
What is the difference between langchain and Mem0?
langchain is written in Python and Mem0 in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, langchain or Mem0?
Choose langchain if you want the larger community (146,538 stars) or its MIT licence terms. Choose Mem0 if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.