head to head · open source
odysseus vs Onyx
odysseus has 87,357 GitHub stars, 903 forks, 1,233 open issues and last shipped 2 days ago. Onyx has 32,149 stars, 4,478 forks, 451 open issues and last shipped yesterday. odysseus leads on adoption by 172% (87,357 vs 32,149 stars). odysseus is written in Python under AGPL-3.0; Onyx is written in Python under a custom or non-standard licence. odysseus has attracted 1% as many forks as stars, Onyx 14%. Onyx 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
| odysseus | Onyx | |
|---|---|---|
| GitHub stars | ★ 87K | ★ 32K |
| License | AGPL-3.0 | Custom / other |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2026-09-18 |
| Forks | ⑂ 903 | ⑂ 4.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick odysseus if
- You weight community size — 87K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Onyx if
- You want the Onyx feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Python
- You evaluated both and Onyx fits your workflow better
About odysseus
Odysseus is a self hosted AI workspace written in Python and released under the AGPL 3.0 or later licence, built for people who want chat, agents, research, documents, email, notes, tasks, and calendar in one deployment on infrastructure they control.
read the full odysseus overview →
About Onyx
Onyx is an open source AI application layer that gives teams a self hostable chat interface with retrieval augmented generation over their own company data and more than 50 indexing connectors.
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Frequently asked questions
Is odysseus or Onyx more popular?
odysseus has 87,357 GitHub stars and Onyx has 32,149. odysseus has the larger community by that measure.
Are odysseus and Onyx free?
Both are open source. odysseus is licensed under AGPL-3.0, and Onyx has no licence declared in this registry. Both are free to self-host.
What is the difference between odysseus and Onyx?
odysseus is written in Python and Onyx 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, odysseus or Onyx?
Choose odysseus if you want the larger community (87,357 stars) or its AGPL-3.0 licence terms. Choose Onyx if its feature set, stack or Custom / other licence fits better. Both are self-hostable.