head to head · open source
Pulumi vs fission
Pulumi has 25,695 GitHub stars, 1,431 forks, 2,419 open issues and last shipped today. fission has 8,920 stars, 794 forks, 50 open issues and last shipped 3 days ago. Pulumi leads on adoption by 188% (25,695 vs 8,920 stars). Pulumi is written in Go under Apache-2.0; fission is written in Go under Apache-2.0. Pulumi has attracted 6% as many forks as stars, fission 9%. Pulumi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (containers, go), so they are genuine substitutes rather than adjacent tools.
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 | fission | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 8.9K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Go |
| Last push | 2026-09-18 | 2026-09-15 |
| Forks | ⑂ 1.4K | ⑂ 794 |
| 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 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 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 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 Pulumi or fission more popular?
Pulumi has 25,695 GitHub stars and fission has 8,920. Pulumi has the larger community by that measure.
Are Pulumi and fission free?
Both are open source. Pulumi is licensed under Apache-2.0 and fission under Apache-2.0. Neither carries a licence fee.
What is the difference between Pulumi and fission?
Pulumi 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, Pulumi or fission?
Choose Pulumi if you want the larger community (25,695 stars) or its Apache-2.0 licence terms. Choose fission if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.