head to head · open source
Kestra vs Prefect
Kestra has 28,146 GitHub stars, 2,997 forks, 713 open issues and last shipped yesterday. Prefect has 23,857 stars, 2,528 forks, 858 open issues and last shipped yesterday. Kestra leads on adoption by 18% (28,146 vs 23,857 stars). Kestra is written in Java under Apache-2.0; Prefect is written in Python under Apache-2.0. Kestra has attracted 11% as many forks as stars, Prefect 11%. Kestra was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (automation, data-engineering), 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
| Kestra | Prefect | |
|---|---|---|
| GitHub stars | ★ 28K | ★ 24K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Python |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.0K | ⑂ 2.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Kestra if
- You weight community size — 28K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick Prefect if
- You want the Prefect feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and Prefect fits your workflow better
About Kestra
Kestra is an open source, event driven orchestration platform for data, AI, and infrastructure workflows. It operates in the Java based ecosystem and is licensed under Apache 2.0. The project provides a unified interface for both scheduled and real time automation, supporting declarative workflow definitions in YAML while also offering visual and AI assisted authoring.
read the full Kestra overview →
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 →
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Frequently asked questions
Is Kestra or Prefect more popular?
Kestra has 28,146 GitHub stars and Prefect has 23,857. Kestra has the larger community by that measure.
Are Kestra and Prefect free?
Both are open source. Kestra is licensed under Apache-2.0 and Prefect under Apache-2.0. Neither carries a licence fee.
What is the difference between Kestra and Prefect?
Kestra is written in Java and Prefect in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Kestra or Prefect?
Choose Kestra if you want the larger community (28,146 stars) or its Apache-2.0 licence terms. Choose Prefect if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.