head to head · open source
haystack vs happier
haystack has 26,580 GitHub stars, 3,163 forks, 143 open issues and last shipped yesterday. happier has 1,706 stars, 152 forks, 160 open issues and last shipped today. haystack leads on adoption by 1,458% (26,580 vs 1,706 stars). haystack is written in Python under Apache-2.0; happier is written in TypeScript under MIT. haystack has attracted 12% as many forks as stars, happier 9%. 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.
← all 20902 open source comparisons
Side by side
| haystack | happier | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 1.7K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-22 | 2026-09-23 |
| Forks | ⑂ 3.2K | ⑂ 152 |
| 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 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 happier
Happier is an open source, MIT licensed control room for coding agents: it runs Claude Code, Codex, OpenCode, Pi and others in parallel on your own machines, and lets you approve, steer, review and commit from web, desktop and mobile clients that are fully end to end encrypted.
read the full happier overview →
More in Infrastructure & Operations
Related comparisons
More Orchestration & Scheduling projects
Compare either of these against the rest of the Orchestration & Scheduling field.
Frequently asked questions
Is haystack or happier more popular?
haystack has 26,580 GitHub stars and happier has 1,706. 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 (26,580 stars) or its Apache-2.0 licence terms. Choose happier if its feature set, stack or MIT licence fits better. Both are self-hostable.