head to head · open source
odysseus vs sim
odysseus has 87,371 GitHub stars, 907 forks, 1,233 open issues and last shipped 2 days ago. sim has 29,663 stars, 3,840 forks, 336 open issues and last shipped yesterday. odysseus leads on adoption by 195% (87,371 vs 29,663 stars). odysseus is written in Python under AGPL-3.0; sim is written in TypeScript under Apache-2.0. odysseus has attracted 1% as many forks as stars, sim 13%. sim 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 | sim | |
|---|---|---|
| GitHub stars | ★ 87K | ★ 30K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-18 |
| Forks | ⑂ 907 | ⑂ 3.8K |
| 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 sim if
- You want the sim feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and sim 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 sim
Sim is an open source collaborative workspace for building, deploying, and monitoring AI agents and workflows. It lives in the TypeScript ecosystem and is distributed under the Apache 2.0 license, with a repository that has accumulated roughly 29,600 stars and 3,800 forks over its two year history. The project positions itself as a single surface where chat, workflows, tables, files, and knowledge coexist, whether accessed through a browser or a desktop application for macOS.
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Frequently asked questions
Is odysseus or sim more popular?
odysseus has 87,371 GitHub stars and sim has 29,663. odysseus has the larger community by that measure.
Are odysseus and sim free?
Both are open source. odysseus is licensed under AGPL-3.0 and sim under Apache-2.0. Neither carries a licence fee.
What is the difference between odysseus and sim?
odysseus is written in Python and sim 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, odysseus or sim?
Choose odysseus if you want the larger community (87,371 stars) or its AGPL-3.0 licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.