head to head · open source
Prefect vs osmedeus
Prefect has 23,857 GitHub stars, 2,528 forks, 858 open issues and last shipped yesterday. osmedeus has 6,568 stars, 1,031 forks, 3 open issues and last shipped 6 days ago. Prefect leads on adoption by 263% (23,857 vs 6,568 stars). Prefect is written in Python under Apache-2.0; osmedeus is written in Go under MIT. Prefect has attracted 11% as many forks as stars, osmedeus 16%. Prefect 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
| Prefect | osmedeus | |
|---|---|---|
| GitHub stars | ★ 24K | ★ 6.6K |
| License | Apache-2.0 | MIT |
| Written in | Python | Go |
| Last push | 2026-09-17 | 2026-09-12 |
| Forks | ⑂ 2.5K | ⑂ 1.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prefect if
- You weight community size — 24K 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 osmedeus if
- You want the osmedeus feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and osmedeus fits your workflow better
About Prefect
Prefect is an open source, Python native workflow orchestration framework that lets data and machine learning teams turn ordinary Python scripts into scheduled, resilient, observable production pipelines.
read the full Prefect overview →
About osmedeus
Osmedeus is a security focused declarative orchestration engine written in Go and released under the MIT license. It turns complex security workflow automation into auditable YAML definitions, and it pairs that declarative model with encrypted data handling, secure credential management, and sandboxed execution. The project has been public for roughly eight years, carries about 6,563 stars and 1,030 forks, and lives in the penetration testing, reconnaissance, and attack surface management corner of the open source security ecosystem. It is distributed both as shell installed binaries and as the npm package @j3ssi…
read the full osmedeus overview →
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Frequently asked questions
Is Prefect or osmedeus more popular?
Prefect has 23,857 GitHub stars and osmedeus has 6,568. Prefect has the larger community by that measure.
Are Prefect and osmedeus free?
Both are open source. Prefect is licensed under Apache-2.0 and osmedeus under MIT. Neither carries a licence fee.
What is the difference between Prefect and osmedeus?
Prefect is written in Python and osmedeus in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Prefect or osmedeus?
Choose Prefect if you want the larger community (23,857 stars) or its Apache-2.0 licence terms. Choose osmedeus if its feature set, stack or MIT licence fits better. Both are self-hostable.