head to head · open source
haystack vs atom
haystack has 26,924 GitHub stars, 3,388 forks, 143 open issues and last shipped yesterday. atom has 911 stars, 93 forks, 2 open issues and last shipped yesterday. haystack leads on adoption by 2,855% (26,924 vs 911 stars). haystack is written in Python under Apache-2.0; atom is written in Python under AGPL-3.0. haystack has attracted 13% as many forks as stars, atom 10%. atom 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 | atom | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 911 |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Python | Python |
| Last push | 2026-11-04 | 2026-11-04 |
| Forks | ⑂ 3.4K | ⑂ 93 |
| 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 atom if
- You want the atom feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Python
- You evaluated both and atom 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 atom
ATOM Platform The governed agent platform — autonomy, earned. 88% of AI agent pilots never reach production. Atom is built for the other path. Industry figure (Turion 2026). Atom makes no claims about its own deployments. What is Atom? Atom is an open source, self hosted AI agent workforce — a team of specialty agents (sales, support, finance, engineering) that your people delegate to in plain language. Where other platforms sell agent capability , Atom sells agent accountability : autonomy that is earned through verified outcomes, executed inside a deterministic safety net, on your hardware. Agents that earn…
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Frequently asked questions
Is haystack or atom more popular?
haystack has 26,924 GitHub stars and atom has 911. haystack has the larger community by that measure.
Are haystack and atom free?
Both are open source. haystack is licensed under Apache-2.0 and atom under AGPL-3.0. Neither carries a licence fee.
What is the difference between haystack and atom?
haystack is written in Python and atom in Python. 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 atom?
Choose haystack if you want the larger community (26,924 stars) or its Apache-2.0 licence terms. Choose atom if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.