head to head · open source
Kestra vs flowable-engine
Kestra has 30,122 GitHub stars, 3,495 forks, 713 open issues and last shipped yesterday. flowable-engine has 9,633 stars, 2,902 forks, 411 open issues and last shipped 16 days ago. Kestra leads on adoption by 213% (30,122 vs 9,633 stars). Kestra is written in Java under Apache-2.0; flowable-engine is written in Java under Apache-2.0. Kestra has attracted 12% as many forks as stars, flowable-engine 30%. Kestra was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | flowable-engine | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 9.6K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Java |
| Last push | 2026-11-02 | 2026-10-18 |
| Forks | ⑂ 3.5K | ⑂ 2.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Kestra if
- You weight community size — 30K 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 flowable-engine if
- You want the flowable-engine feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and flowable-engine fits your workflow better
About Kestra
Open source orchestration platform for data, AI, and infrastructure workflows Click on the image to learn how to get started with Kestra in 3 minutes. 🌟 What is Kestra? Kestra is an open source, event driven orchestration platform for data, AI, and infrastructure workflows. It unifies scheduled and event driven automation behind a declarative, language agnostic interface. By bringing Infrastructure as Code best practices to your data, process, and microservice pipelines, you can build reliable workflows directly from the UI in just a few lines of YAML, let the built in AI Copilot write them for you, or generate…
read the full Kestra overview →
About flowable-engine
Flowable ======== Homepage: flowable / flowəb(ə)l / a compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users. a lightning fast, tried and tested BPMN process engine, CMMN case engine and DMN rule engine written in Java. It is Apache 2.0 licensed open source, with a committed community. can run embedded in a Java application, or as a service on a server, a cluster, and in the cloud. It integrates perfectly with Spring. With a rich Java and REST API, it is the ideal engine for orchestrating human or system activities. Introduction…
read the full flowable-engine overview →
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Frequently asked questions
Is Kestra or flowable-engine more popular?
Kestra has 30,122 GitHub stars and flowable-engine has 9,633. Kestra has the larger community by that measure.
Are Kestra and flowable-engine free?
Both are open source. Kestra is licensed under Apache-2.0 and flowable-engine under Apache-2.0. Neither carries a licence fee.
What is the difference between Kestra and flowable-engine?
Kestra is written in Java and flowable-engine in Java. 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 flowable-engine?
Choose Kestra if you want the larger community (30,122 stars) or its Apache-2.0 licence terms. Choose flowable-engine if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.