OpenFaaS vs Fermyon Spin: Which Should You Choose in 2026?
Choosing between OpenFaaS and Fermyon Spin comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
By Toolradar Team · Last updated February 28, 2026 · Methodology
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
OpenFaaS
Serverless functions on Kubernetes
Best for you if:
- • You want the higher-rated option (8.0/10 vs 7.6/10)
- • You need something completely free
- • OpenFaaS is an open-source serverless framework for Docker and Kubernetes
- • It deploys functions as containers with auto-scaling and metrics
Fermyon Spin
Framework for serverless WebAssembly applications
Best for you if:
- • Fermyon Spin is a framework for building and running WebAssembly microservices
- • It enables fast-starting serverless functions written in Rust, Go, and other languages
| At a Glance |  OpenFaaS |  Fermyon Spin |
|---|---|---|
Price | Free | Free + Paid |
Best For | API Tools | API Tools |
Rating | 80/100 | 76/100 |
| Feature | OpenFaaS | Fermyon Spin |
|---|---|---|
| Pricing Model | Free | Freemium |
| Editorial Score | 80 | 76 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | API ToolsContainer Orchestration | API ToolsLow-Code Backend |
How OpenFaaS and Fermyon Spin Compare
OpenFaaS
Serverless functions on Kubernetes
Free · 80/100 score
Fermyon Spin
Framework for serverless WebAssembly applications
Free tier available · 76/100 score
Who Should Use What?
On a budget?
OpenFaaS is free. Fermyon Spin is freemium.
Go with: OpenFaaS
Want the highest-rated option?
OpenFaaS: 80/100. Fermyon Spin: 76/100.
Go with: OpenFaaS
Value user reviews?
Neither has user reviews yet.
Go with: OpenFaaS
3 Questions to Help You Decide
What's your budget?
OpenFaaS is free. Fermyon Spin is freemium. Go with OpenFaaS if free matters most.
What's your use case?
Both are api tools tools. Compare their specific features to decide.
How important are ratings?
OpenFaaS scores higher: 80/100 vs 76/100.
Key Takeaways
OpenFaaS
- Higher score: 80/100 vs 76
- Completely free
- Our pick for this comparison
Fermyon Spin
The Bottom Line
OpenFaaS (80/100) is our pick.
Frequently Asked Questions
Is OpenFaaS or Fermyon Spin better?
OpenFaaS scores 80/100 in our evaluation. OpenFaaS is free and Fermyon Spin is freemium.
What are OpenFaaS and Fermyon Spin used for?
OpenFaaS: Serverless functions on Kubernetes. Fermyon Spin: Framework for serverless WebAssembly applications.
What does OpenFaaS cost vs Fermyon Spin?
OpenFaaS is completely free. Fermyon Spin is freemium (free tier + paid plans). Visit their websites for detailed pricing.