head to head · open source
flowable-engine vs Juggle
flowable-engine has 9,542 GitHub stars, 2,890 forks, 411 open issues and last shipped 3 days ago. Juggle has 1,148 stars, 200 forks, 7 open issues and last shipped 6 days ago. flowable-engine leads on adoption by 731% (9,542 vs 1,148 stars). flowable-engine is written in Java under Apache-2.0; Juggle is written in Java under GPL-3.0. flowable-engine has attracted 30% as many forks as stars, Juggle 17%. flowable-engine was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (workflow-engine), 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
| flowable-engine | Juggle | |
|---|---|---|
| GitHub stars | ★ 9.5K | ★ 1.1K |
| License | Apache-2.0 | GPL-3.0 |
| Written in | Java | Java |
| Last push | 2026-09-17 | 2026-09-14 |
| Forks | ⑂ 2.9K | ⑂ 200 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick flowable-engine if
- You weight community size — 9.5K 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 Juggle if
- You want the Juggle feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Java
- You evaluated both and Juggle fits your workflow better
About flowable-engine
Flowable is an open source workflow and Business Process Management platform written in Java and distributed under the Apache 2.0 license. It bundles three engines in one project: a BPMN process engine, a CMMN case engine, and a DMN rule engine. The project lives in the Java ecosystem, integrates with Spring, and exposes both a Java API and a REST API for orchestrating human or system activities.
read the full flowable-engine overview →
About Juggle
Juggle is a low code, zero code and AI assisted microservice API orchestration and system integration platform for Java teams that need to compose existing HTTP, Dubbo and WebService APIs into new endpoints without writing a new service.
read the full Juggle overview →
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Frequently asked questions
Is flowable-engine or Juggle more popular?
flowable-engine has 9,542 GitHub stars and Juggle has 1,148. flowable-engine has the larger community by that measure.
Are flowable-engine and Juggle free?
Both are open source. flowable-engine is licensed under Apache-2.0 and Juggle under GPL-3.0. Neither carries a licence fee.
What is the difference between flowable-engine and Juggle?
flowable-engine is written in Java and Juggle 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, flowable-engine or Juggle?
Choose flowable-engine if you want the larger community (9,542 stars) or its Apache-2.0 licence terms. Choose Juggle if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.