head to head · open source
haystack vs Trigger
haystack has 26,531 GitHub stars, 3,144 forks, 143 open issues and last shipped yesterday. Trigger has 16,324 stars, 1,462 forks, 342 open issues and last shipped yesterday. haystack leads on adoption by 63% (26,531 vs 16,324 stars). haystack is written in Python under Apache-2.0; Trigger is written in TypeScript under Apache-2.0. haystack has attracted 12% as many forks as stars, Trigger 9%. Trigger was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai, 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 | Trigger | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 16K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.1K | ⑂ 1.5K |
| 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 Trigger if
- You want the Trigger feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and Trigger 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 Trigger
Trigger is an open source TypeScript platform for building and deploying AI agents and workflow tasks. It lives in the infrastructure, orchestration, and scheduling ecosystem, and it is positioned as a way to run long running AI tasks without typical serverless timeout constraints. The project provides a software development kit, a deployment target, and operational features such as retries, queues, observability, and elastic scaling.
read the full Trigger overview →
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Frequently asked questions
Is haystack or Trigger more popular?
haystack has 26,531 GitHub stars and Trigger has 16,324. haystack has the larger community by that measure.
Are haystack and Trigger free?
Both are open source. haystack is licensed under Apache-2.0 and Trigger under Apache-2.0. Neither carries a licence fee.
What is the difference between haystack and Trigger?
haystack is written in Python and Trigger 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 Trigger?
Choose haystack if you want the larger community (26,531 stars) or its Apache-2.0 licence terms. Choose Trigger if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.