head to head · open source
loopx vs second-brain
loopx has 6,549 GitHub stars, 616 forks, 102 open issues and last shipped yesterday. second-brain has 678 stars, 87 forks, 1 open issues and last shipped 1 months ago. loopx leads on adoption by 866% (6,549 vs 678 stars). loopx is written in Python under Apache-2.0; second-brain is written in Python under MIT. loopx has attracted 9% as many forks as stars, second-brain 13%. loopx was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-agents), 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
| loopx | second-brain | |
|---|---|---|
| GitHub stars | ★ 6.5K | ★ 678 |
| License | Apache-2.0 | MIT |
| Written in | Python | Python |
| Last push | 2026-11-04 | 2026-09-26 |
| Forks | ⑂ 616 | ⑂ 87 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick loopx if
- You weight community size — 6.5K 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 second-brain if
- You want the second-brain feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and second-brain fits your workflow better
About loopx
LoopX The open, provider neutral, stateful control plane for long horizon agents. Runs on top of Codex, Claude Code, Cursor, and other agent harnesses. LoopX preserves objectives, gates, todos, evidence, quota, and handoffs across turns; the harness executes bounded work. Public website · Blog · Docs · Developer Book · Try LoopX · See real loops · How it works · 简体中文 Open and provider neutral, LoopX is a lightweight state kernel and local first control plane for loop engineering. It runs on top of different agent harnesses rather than replacing them, providing the long horizon state, semantic decisions about…
read the full loopx overview →
About second-brain
Quick install Sponsor Atlas Cloud is a full modal AI inference platform that gives developers a single AI API to access video generation, image generation, and LLM APIs. Instead of managing multiple vendor integrations, you connect once and get unified access to 300+ curated models across all modalities. Check out Atlas Cloud's new coding plan promotion for more budget friendly API access: Second Brain Example For an example of what Second Brain can do, visit It's an interactive art exhibition. Head to Head Evaluation Second Brain performs higher than OpenClaw and Hermes on harness bench, which measures "model…
read the full second-brain overview →
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Frequently asked questions
Is loopx or second-brain more popular?
loopx has 6,549 GitHub stars and second-brain has 678. loopx has the larger community by that measure.
Are loopx and second-brain free?
Both are open source. loopx is licensed under Apache-2.0 and second-brain under MIT. Neither carries a licence fee.
What is the difference between loopx and second-brain?
loopx is written in Python and second-brain 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, loopx or second-brain?
Choose loopx if you want the larger community (6,549 stars) or its Apache-2.0 licence terms. Choose second-brain if its feature set, stack or MIT licence fits better. Both are self-hostable.