head to head · open source
haystack vs bree
haystack has 26,913 GitHub stars, 3,384 forks, 143 open issues and last shipped yesterday. bree has 3,297 stars, 91 forks, 29 open issues and last shipped 9 months ago. haystack leads on adoption by 716% (26,913 vs 3,297 stars). haystack is written in Python under Apache-2.0; bree is written in JavaScript under MIT. haystack has attracted 13% as many forks as stars, bree 3%. haystack 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
| haystack | bree | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 3.3K |
| License | Apache-2.0 | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-11-02 | 2026-02-17 |
| Forks | ⑂ 3.4K | ⑂ 91 |
| 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 bree if
- You want the bree feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and bree 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 bree
Bree is the best job scheduler for Node.js and JavaScript with cron , dates , ms , later , and human friendly support. Works in Node v12.17.0+, uses worker threads (Node.js) to spawn sandboxed processes, and supports async/await , retries , throttling , concurrency , and cancelable jobs with graceful shutdown . Simple, fast, and lightweight. Made for Forward Email and Lad . Table of Contents Foreword Install Upgrading Usage and Examples ECMAScript modules (ESM) CommonJS (CJS) Instance Options Job Options Job Interval and Timeout Values Listening for events Custom error/message handling Cancellation, Retries…
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Frequently asked questions
Is haystack or bree more popular?
haystack has 26,913 GitHub stars and bree has 3,297. haystack has the larger community by that measure.
Are haystack and bree free?
Both are open source. haystack is licensed under Apache-2.0 and bree under MIT. Neither carries a licence fee.
What is the difference between haystack and bree?
haystack is written in Python and bree in JavaScript. 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 bree?
Choose haystack if you want the larger community (26,913 stars) or its Apache-2.0 licence terms. Choose bree if its feature set, stack or MIT licence fits better. Both are self-hostable.