head to head · open source
Prefect vs cloudstack
Prefect has 23,882 GitHub stars, 2,527 forks, 858 open issues and last shipped today. cloudstack has 3,075 stars, 1,385 forks, 1,048 open issues and last shipped yesterday. Prefect leads on adoption by 677% (23,882 vs 3,075 stars). Prefect is written in Python under Apache-2.0; cloudstack is written in Java under Apache-2.0. Prefect has attracted 11% as many forks as stars, cloudstack 45%. Prefect was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (infrastructure, orchestration, python), 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 | cloudstack | |
|---|---|---|
| GitHub stars | ★ 24K | ★ 3.1K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-09-20 | 2026-09-19 |
| Forks | ⑂ 2.5K | ⑂ 1.4K |
| 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 cloudstack if
- You want the cloudstack 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 cloudstack 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 cloudstack
Apache CloudStack is an open source Infrastructure as a Service (IaaS) cloud computing platform, written primarily in Java and released under the Apache 2.0 licence, that deploys and manages large networks of virtual machines for service providers, enterprises, and operators who need a cloud they control.
read the full cloudstack overview →
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Frequently asked questions
Is Prefect or cloudstack more popular?
Prefect has 23,882 GitHub stars and cloudstack has 3,075. Prefect has the larger community by that measure.
Are Prefect and cloudstack free?
Both are open source. Prefect is licensed under Apache-2.0 and cloudstack under Apache-2.0. Neither carries a licence fee.
What is the difference between Prefect and cloudstack?
Prefect is written in Python and cloudstack 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, Prefect or cloudstack?
Choose Prefect if you want the larger community (23,882 stars) or its Apache-2.0 licence terms. Choose cloudstack if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.