head to head · open source
haystack vs happier
haystack has 26,913 GitHub stars, 3,384 forks, 143 open issues and last shipped yesterday. happier has 2,117 stars, 211 forks, 160 open issues and last shipped yesterday. haystack leads on adoption by 1,171% (26,913 vs 2,117 stars). haystack is written in Python under Apache-2.0; happier is written in TypeScript under MIT. haystack has attracted 13% as many forks as stars, happier 10%. happier was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-agents), 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 | happier | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 2.1K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.4K | ⑂ 211 |
| 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 happier if
- You want the happier feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and happier 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 happier
One control room for all your coding agents. The way orchestrating agents should feel. From your phone, desktop and browser. Claude Code, Codex, OpenCode, Pi and more, working together and in parallel on your own machines. Sessions can spawn subagents across agents: e.g. Claude asking Codex for a review, or Codex delegating to Claude subagents. Switch agents mid session. Approve, steer, review and commit from wherever you are. Open source · Self hostable · End to end encrypted Get started · Downloads · Docs · Self host · Discord Latest Happier project update Happier is free and open source. Your agents keep…
read the full happier overview →
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Frequently asked questions
Is haystack or happier more popular?
haystack has 26,913 GitHub stars and happier has 2,117. haystack has the larger community by that measure.
Are haystack and happier free?
Both are open source. haystack is licensed under Apache-2.0 and happier under MIT. Neither carries a licence fee.
What is the difference between haystack and happier?
haystack is written in Python and happier 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 happier?
Choose haystack if you want the larger community (26,913 stars) or its Apache-2.0 licence terms. Choose happier if its feature set, stack or MIT licence fits better. Both are self-hostable.