head to head · open source
OpenTofu vs st2
OpenTofu has 30,209 GitHub stars, 1,368 forks, 320 open issues and last shipped yesterday. st2 has 6,536 stars, 787 forks, 603 open issues and last shipped 16 days ago. OpenTofu leads on adoption by 362% (30,209 vs 6,536 stars). OpenTofu is written in Go under MPL-2.0; st2 is written in Python under Apache-2.0. OpenTofu has attracted 5% as many forks as stars, st2 12%. 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 | st2 | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 6.5K |
| License | MPL-2.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-09-17 | 2026-09-02 |
| Forks | ⑂ 1.4K | ⑂ 787 |
| 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 st2 if
- You want the st2 feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and st2 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 st2
StackStorm — packaged and installed as st2 — is an open source, event driven automation platform, often described as "IFTTT for Ops", that ties existing infrastructure, monitoring and application tools together so DevOps engineers and SREs can automate remediation, incident response, troubleshooting and deployment as rules and workflows stored as code.
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Frequently asked questions
Is OpenTofu or st2 more popular?
OpenTofu has 30,209 GitHub stars and st2 has 6,536. OpenTofu has the larger community by that measure.
Are OpenTofu and st2 free?
Both are open source. OpenTofu is licensed under MPL-2.0 and st2 under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenTofu and st2?
OpenTofu is written in Go and st2 in Python. 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 st2?
Choose OpenTofu if you want the larger community (30,209 stars) or its MPL-2.0 licence terms. Choose st2 if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.