head to head · open source
Leon vs Scira
Leon has 17,629 GitHub stars, 1,479 forks, 112 open issues and last shipped yesterday. Scira has 11,908 stars, 1,498 forks, 25 open issues and last shipped 3 months ago. Leon leads on adoption by 48% (17,629 vs 11,908 stars). Leon is written in TypeScript under MIT; Scira is written in TypeScript under AGPL-3.0. Leon has attracted 8% as many forks as stars, Scira 13%. Leon was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Leon | Scira | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 12K |
| License | MIT | AGPL-3.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-08-12 |
| Forks | ⑂ 1.5K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Leon if
- You weight community size — 18K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Scira if
- You want the Scira feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and Scira fits your workflow better
About Leon
Leon Your open source personal AI assistant. I share Leon progress most regularly on X / @grenlouis Follow progress on X / @grenlouis · Website · Newsletter · Roadmap · Story ⚠️ Important Notice (as of 2026 03 29) [!IMPORTANT] Leon is currently focused on the 2.0 Developer Preview on the develop branch. The new documentation is not ready yet . The current docs site and older guides mostly reflect the legacy architecture. If you want the legacy, more stable pre agentic version of Leon, use the master branch. If you want to explore or contribute to Leon's new core, develop is the right place. The most accurate…
About Scira
Scira Research at the speed of thought. The agentic research platform that plans, retrieves, and cites — so you can think faster. Context.dev, One API to fetch the internet Sign up for 500 credits free, no card required. 🔗 Try Scira at scira.ai Powered By How It Works 1. Ask anything — Type a question, upload a PDF, or paste a URL. Pick a mode or let Scira decide for you. 2. Scira plans & retrieves — The agent breaks your question into sub tasks, searches live sources, and cross checks the evidence. 3. Get cited answers — Receive a grounded answer with inline citations. Click any source to verify it yourself…
read the full Scira overview →
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Frequently asked questions
Is Leon or Scira more popular?
Leon has 17,629 GitHub stars and Scira has 11,908. Leon has the larger community by that measure.
Are Leon and Scira free?
Both are open source. Leon is licensed under MIT and Scira under AGPL-3.0. Neither carries a licence fee.
What is the difference between Leon and Scira?
Leon is written in TypeScript and Scira 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, Leon or Scira?
Choose Leon if you want the larger community (17,629 stars) or its MIT licence terms. Choose Scira if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.