head to head · open source
Prefect vs Trigger
Prefect has 23,857 GitHub stars, 2,528 forks, 858 open issues and last shipped yesterday. Trigger has 16,324 stars, 1,462 forks, 342 open issues and last shipped yesterday. Prefect leads on adoption by 46% (23,857 vs 16,324 stars). Prefect is written in Python under Apache-2.0; Trigger is written in TypeScript under Apache-2.0. Prefect has attracted 11% 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 (automation, orchestration), 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
| Prefect | Trigger | |
|---|---|---|
| GitHub stars | ★ 24K | ★ 16K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.5K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prefect if
- You weight community size — 24K 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 Prefect
Prefect is an open source, Python native workflow orchestration framework that lets data and machine learning teams turn ordinary Python scripts into scheduled, resilient, observable production pipelines.
read the full Prefect 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 Prefect or Trigger more popular?
Prefect has 23,857 GitHub stars and Trigger has 16,324. Prefect has the larger community by that measure.
Are Prefect and Trigger free?
Both are open source. Prefect is licensed under Apache-2.0 and Trigger under Apache-2.0. Neither carries a licence fee.
What is the difference between Prefect and Trigger?
Prefect 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, Prefect or Trigger?
Choose Prefect if you want the larger community (23,857 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.