head to head · open source
OpenTofu vs fission
OpenTofu has 30,703 GitHub stars, 1,414 forks, 320 open issues and last shipped yesterday. fission has 8,939 stars, 795 forks, 50 open issues and last shipped 7 days ago. OpenTofu leads on adoption by 243% (30,703 vs 8,939 stars). OpenTofu is written in Go under MPL-2.0; fission is written in Go under Apache-2.0. OpenTofu has attracted 5% as many forks as stars, fission 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 | fission | |
|---|---|---|
| GitHub stars | ★ 31K | ★ 8.9K |
| License | MPL-2.0 | Apache-2.0 |
| Written in | Go | Go |
| Last push | 2026-11-02 | 2026-10-27 |
| Forks | ⑂ 1.4K | ⑂ 795 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenTofu if
- You weight community size — 31K 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 fission if
- You want the fission 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 fission fits your workflow better
About OpenTofu
Homepage Slack Get Started OpenTofu is an OSS tool for building, changing, and versioning infrastructure safely and efficiently. OpenTofu can manage existing and popular service providers as well as custom in house solutions. Getting help and contributing Have a question? Post it in GitHub Discussions Open a GitHub issue Join us in the opentofu channel on the CNCF Slack! Want to contribute? Please read the Contribution Guide. Recurring Events Community Meetings on Wednesdays at 12:30 UTC (calendar) Technical Steering Committee Meetings every other Tuesday at 4pm UTC (calendar) [!TIP] For more OpenTofu events…
read the full OpenTofu overview →
About fission
Fission: Serverless Functions for Kubernetes Fission is an open source, Kubernetes native serverless framework that simplifies the deployment of functions and applications on Kubernetes. With Fission, developers can easily create and deploy serverless functions that can be triggered by a variety of events, such as HTTP requests, messages from a message queue, or scheduled tasks. Fission provides a simple, easy to use interface for developers to create serverless functions in their language of choice, without having to worry about the underlying infrastructure. The framework also offers automatic scaling, so…
read the full fission overview →
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Frequently asked questions
Is OpenTofu or fission more popular?
OpenTofu has 30,703 GitHub stars and fission has 8,939. OpenTofu has the larger community by that measure.
Are OpenTofu and fission free?
Both are open source. OpenTofu is licensed under MPL-2.0 and fission under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenTofu and fission?
OpenTofu is written in Go and fission 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 fission?
Choose OpenTofu if you want the larger community (30,703 stars) or its MPL-2.0 licence terms. Choose fission if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.