head to head · open source
OpenTofu vs fission
OpenTofu has 30,209 GitHub stars, 1,368 forks, 320 open issues and last shipped yesterday. fission has 8,920 stars, 794 forks, 50 open issues and last shipped 3 days ago. OpenTofu leads on adoption by 239% (30,209 vs 8,920 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 | ★ 30K | ★ 8.9K |
| License | MPL-2.0 | Apache-2.0 |
| Written in | Go | Go |
| Last push | 2026-09-17 | 2026-09-15 |
| Forks | ⑂ 1.4K | ⑂ 794 |
| 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 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
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 fission
Fission is an open source, Kubernetes native serverless framework that lets developers deploy functions triggered by HTTP requests, message queue messages, or scheduled tasks without managing the underlying infrastructure.
read the full fission overview →
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Frequently asked questions
Is OpenTofu or fission more popular?
OpenTofu has 30,209 GitHub stars and fission has 8,920. 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 (30,209 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.