head to head · open source
Pulumi vs st2
Pulumi has 25,695 GitHub stars, 1,431 forks, 2,419 open issues and last shipped today. st2 has 6,536 stars, 787 forks, 603 open issues and last shipped 16 days ago. Pulumi leads on adoption by 293% (25,695 vs 6,536 stars). Pulumi is written in Go under Apache-2.0; st2 is written in Python under Apache-2.0. Pulumi has attracted 6% as many forks as stars, st2 12%. Pulumi 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
| Pulumi | st2 | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 6.5K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-09-18 | 2026-09-02 |
| Forks | ⑂ 1.4K | ⑂ 787 |
| 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 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 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 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 Pulumi or st2 more popular?
Pulumi has 25,695 GitHub stars and st2 has 6,536. Pulumi has the larger community by that measure.
Are Pulumi and st2 free?
Both are open source. Pulumi is licensed under Apache-2.0 and st2 under Apache-2.0. Neither carries a licence fee.
What is the difference between Pulumi and st2?
Pulumi 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, Pulumi or st2?
Choose Pulumi if you want the larger community (25,695 stars) or its Apache-2.0 licence terms. Choose st2 if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.