head to head · open source
haystack vs Archon
haystack has 26,913 GitHub stars, 3,384 forks, 143 open issues and last shipped yesterday. Archon has 23,807 stars, 3,518 forks, 321 open issues and last shipped yesterday. haystack leads on adoption by 13% (26,913 vs 23,807 stars). haystack is written in Python under Apache-2.0; Archon is written in TypeScript under MIT. haystack has attracted 13% as many forks as stars, Archon 15%. Archon was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (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 | Archon | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 24K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.4K | ⑂ 3.5K |
| 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 Archon if
- You want the Archon feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Archon 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 Archon
Archon The first open source harness builder for AI coding. Make AI coding deterministic and repeatable. Archon is a workflow engine for AI coding agents. Define your development processes as YAML workflows planning, implementation, validation, code review, PR creation and run them reliably across all your projects. Like what Dockerfiles did for infrastructure and GitHub Actions did for CI/CD Archon does for AI coding workflows. Think n8n, but for software development. Why Archon? When you ask an AI agent to "fix this bug", what happens depends on the model's mood. It might skip planning. It might forget to run…
read the full Archon overview →
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Frequently asked questions
Is haystack or Archon more popular?
haystack has 26,913 GitHub stars and Archon has 23,807. haystack has the larger community by that measure.
Are haystack and Archon free?
Both are open source. haystack is licensed under Apache-2.0 and Archon under MIT. Neither carries a licence fee.
What is the difference between haystack and Archon?
haystack is written in Python and Archon 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, haystack or Archon?
Choose haystack if you want the larger community (26,913 stars) or its Apache-2.0 licence terms. Choose Archon if its feature set, stack or MIT licence fits better. Both are self-hostable.