head to head · open source
Pulumi vs Cozystack
Pulumi has 25,694 GitHub stars, 1,431 forks, 2,419 open issues and last shipped yesterday. Cozystack has 2,227 stars, 201 forks, 757 open issues and last shipped yesterday. Pulumi leads on adoption by 1,054% (25,694 vs 2,227 stars). Pulumi is written in Go under Apache-2.0; Cozystack is written in Go under Apache-2.0. Pulumi has attracted 6% as many forks as stars, Cozystack 9%. Pulumi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (cloud), 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
| Pulumi | Cozystack | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 2.2K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Go |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 1.4K | ⑂ 201 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Pulumi if
- You weight community size — 26K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick Cozystack if
- You want the Cozystack feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and Cozystack fits your workflow better
About Pulumi
Pulumi is an open source infrastructure as code tool that lets teams define and deploy cloud infrastructure using general purpose programming languages instead of YAML, aimed at developers, platform engineers, and agents working across AWS, Azure, Google Cloud Platform, and Kubernetes.
read the full Pulumi overview →
About Cozystack
Cozystack is a free cloud platform and framework for building clouds inside the Kubernetes ecosystem. It is a CNCF Sandbox Level project originally built and sponsored by Ænix, and it is written in Go under the Apache 2.0 license. The project turns a group of servers into an intelligent infrastructure system that exposes a simple REST API for creating and managing cloud services.
read the full Cozystack overview →
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Frequently asked questions
Is Pulumi or Cozystack more popular?
Pulumi has 25,694 GitHub stars and Cozystack has 2,227. Pulumi has the larger community by that measure.
Are Pulumi and Cozystack free?
Both are open source. Pulumi is licensed under Apache-2.0 and Cozystack under Apache-2.0. Neither carries a licence fee.
What is the difference between Pulumi and Cozystack?
Pulumi is written in Go and Cozystack in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Pulumi or Cozystack?
Choose Pulumi if you want the larger community (25,694 stars) or its Apache-2.0 licence terms. Choose Cozystack if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.