head to head · open source
haystack vs Archon
haystack has 26,531 GitHub stars, 3,144 forks, 143 open issues and last shipped yesterday. Archon has 23,495 stars, 3,474 forks, 321 open issues and last shipped yesterday. haystack leads on adoption by 13% (26,531 vs 23,495 stars). haystack is written in Python under Apache-2.0; Archon is written in TypeScript under MIT. haystack has attracted 12% as many forks as stars, Archon 15%. haystack 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 | ★ 23K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.1K | ⑂ 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 is an open source AI orchestration framework written in Python under the Apache 2.0 licence, for building context engineered, production ready large language model applications as modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation, and it is aimed at developers and teams building scalable agents, retrieval augmented generation, multimodal applications, semantic search, question answering, and conversational systems.
read the full haystack overview →
About Archon
Archon is an open source workflow engine for AI coding agents, written in TypeScript and released under the MIT license. It lives in the AI coding ecosystem, alongside tools such as Claude Code, and is distributed through the Bun runtime and the GitHub CLI. The project describes itself as a harness builder: it lets a developer encode a development process as a YAML workflow and then run that workflow reliably across projects. Workflows are stored in a .archon/workflows/ directory and committed to the repository, so the same definition can be invoked from the CLI, a web UI, Slack, Telegram, or GitHub.…
read the full Archon overview →
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Frequently asked questions
Is haystack or Archon more popular?
haystack has 26,531 GitHub stars and Archon has 23,495. 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 (26,531 stars) or its Apache-2.0 licence terms. Choose Archon if its feature set, stack or MIT licence fits better. Both are self-hostable.