head to head · open source
Pulumi vs fission
Pulumi has 25,840 GitHub stars, 1,478 forks, 2,419 open issues and last shipped yesterday. fission has 8,939 stars, 795 forks, 50 open issues and last shipped 7 days ago. Pulumi leads on adoption by 189% (25,840 vs 8,939 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 | 2026-11-02 | 2026-10-27 |
| Forks | ⑂ 1.5K | ⑂ 795 |
| 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
Infrastructure as Code for Humans and Agents Pulumi Infrastructure as Code is the easiest way to build and deploy infrastructure, of any architecture and on any cloud, using programming languages that you already know and love. Code and ship infrastructure faster with your favorite languages and tools, and embed IaC anywhere with Automation API. Simply write code in your favorite language and Pulumi automatically provisions and manages your resources on AWS, Azure, Google Cloud Platform, Kubernetes, and 300+ providers using an infrastructure as code approach. Skip the YAML, and use standard language features…
read the full Pulumi 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 Pulumi or fission more popular?
Pulumi has 25,840 GitHub stars and fission has 8,939. 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 (25,840 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.