head to head · open source
OpenTofu vs Cozystack
OpenTofu has 30,204 GitHub stars, 1,367 forks, 320 open issues and last shipped yesterday. Cozystack has 2,227 stars, 201 forks, 757 open issues and last shipped yesterday. OpenTofu leads on adoption by 1,256% (30,204 vs 2,227 stars). OpenTofu is written in Go under MPL-2.0; Cozystack is written in Go under Apache-2.0. OpenTofu has attracted 5% as many forks as stars, Cozystack 9%. OpenTofu 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
| OpenTofu | Cozystack | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 2.2K |
| License | MPL-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 OpenTofu if
- You weight community size — 30K stars and counting
- You want the MPL-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 OpenTofu
OpenTofu is an open source infrastructure as code (IaC) tool that enables users to define and manage cloud and on premises infrastructure using declarative configuration files. It lives in the cloud infrastructure management ecosystem and serves as a community driven fork of Terraform, maintaining compatibility with Terraform’s configuration language and provider ecosystem while operating under the MPL 2.0 license.
read the full OpenTofu 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 OpenTofu or Cozystack more popular?
OpenTofu has 30,204 GitHub stars and Cozystack has 2,227. OpenTofu has the larger community by that measure.
Are OpenTofu and Cozystack free?
Both are open source. OpenTofu is licensed under MPL-2.0 and Cozystack under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenTofu and Cozystack?
OpenTofu 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, OpenTofu or Cozystack?
Choose OpenTofu if you want the larger community (30,204 stars) or its MPL-2.0 licence terms. Choose Cozystack if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.