head to head · open source
Mem0 vs CL4R1T4S
Mem0 has 65,672 GitHub stars, 7,712 forks, 742 open issues and last shipped yesterday. CL4R1T4S has 50,059 stars, 10,280 forks, 127 open issues and last shipped 10 days ago. Mem0 leads on adoption by 31% (65,672 vs 50,059 stars). Mem0 is written in Python under Apache-2.0; CL4R1T4S is written in various languages under AGPL-3.0. Mem0 has attracted 12% as many forks as stars, CL4R1T4S 21%. Mem0 was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (agents, ai, 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
| Mem0 | CL4R1T4S | |
|---|---|---|
| GitHub stars | ★ 66K | ★ 50K |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Python | — |
| Last push | 2026-09-19 | 2026-09-10 |
| Forks | ⑂ 7.7K | ⑂ 10K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mem0 if
- You weight community size — 66K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick CL4R1T4S if
- You want the CL4R1T4S feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- You evaluated both and CL4R1T4S fits your workflow better
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.
About CL4R1T4S
CL4R1T4S is an AGPL 3.0 repository of full extracted system prompts, guidelines and tools from the major AI models and agents — ChatGPT, Claude, Gemini, Grok, Perplexity, Cursor, Lovable, Replit and more — for anyone who wants to know what instructions sit behind the AI systems they use.
read the full CL4R1T4S overview →
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Frequently asked questions
Is Mem0 or CL4R1T4S more popular?
Mem0 has 65,672 GitHub stars and CL4R1T4S has 50,059. Mem0 has the larger community by that measure.
Are Mem0 and CL4R1T4S free?
Both are open source. Mem0 is licensed under Apache-2.0 and CL4R1T4S under AGPL-3.0. Neither carries a licence fee.
What is the difference between Mem0 and CL4R1T4S?
Mem0 is written in Python and CL4R1T4S in various languages. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Mem0 or CL4R1T4S?
Choose Mem0 if you want the larger community (65,672 stars) or its Apache-2.0 licence terms. Choose CL4R1T4S if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.