head to head · open source
haystack vs osmedeus
haystack has 26,913 GitHub stars, 3,384 forks, 143 open issues and last shipped yesterday. osmedeus has 6,638 stars, 1,035 forks, 3 open issues and last shipped 1 months ago. haystack leads on adoption by 305% (26,913 vs 6,638 stars). haystack is written in Python under Apache-2.0; osmedeus is written in Go under MIT. haystack has attracted 13% as many forks as stars, osmedeus 16%. haystack was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (agentic-ai), 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
| haystack | osmedeus | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 6.6K |
| License | Apache-2.0 | MIT |
| Written in | Python | Go |
| Last push | 2026-11-02 | 2026-10-04 |
| Forks | ⑂ 3.4K | ⑂ 1.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick haystack if
- You weight community size — 27K 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 haystack
🎉🎊✨ Haystack 3.0 is out! ✨🎊🎉 Read the announcement here! 🥳 🎈 🎆 🪅 🎇 🍾 🥂 🎁 🌈 Haystack is an open source AI orchestration framework for building production ready LLM applications in Python. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Build scalable RAG systems, multimodal applications, semantic search, question answering, and autonomous agents, all in a transparent architecture that lets you experiment, customize deeply, and deploy with confidence. Table of Contents Installation Documentation Features Haystack Enterprise: Support &…
read the full haystack overview →
About osmedeus
Osmedeus Osmedeus A Modern Orchestration Engine for Security What is Osmedeus? Osmedeus is a security focused declarative orchestration engine that simplifies complex workflow automation into auditable YAML definitions, complete with encrypted data handling, secure credential management, and sandboxed execution. Built for both beginners and experts, it delivers powerful, composable automation without sacrificing the integrity and safety of your infrastructure. Key Features Declarative YAML Workflows Define pipelines with hooks, decision routing, module exclusion, and conditional branching across multiple runners…
read the full osmedeus overview →
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Frequently asked questions
Is haystack or osmedeus more popular?
haystack has 26,913 GitHub stars and osmedeus has 6,638. haystack has the larger community by that measure.
Are haystack and osmedeus free?
Both are open source. haystack is licensed under Apache-2.0 and osmedeus under MIT. Neither carries a licence fee.
What is the difference between haystack and osmedeus?
haystack 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, haystack or osmedeus?
Choose haystack if you want the larger community (26,913 stars) or its Apache-2.0 licence terms. Choose osmedeus if its feature set, stack or MIT licence fits better. Both are self-hostable.