WinterJS vs Fermyon Spin: Which Should You Choose in 2026?
Choosing between WinterJS 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:
WinterJS
Blazing-fast JavaScript server for Service Workers, built for high performance.
Best for you if:
- • You need something completely free
- • You need hosting & deployment features specifically
- • A blazing-fast JavaScript server running WinterCG-compliant Service Workers.
- • Achieves high performance, handling up to 100,000 requests/second.
Fermyon Spin
Framework for serverless WebAssembly applications
Best for you if:
- • You want the higher-rated option (7.6/10 vs 0.0/10)
- • You need api tools features specifically
- • 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 |  WinterJS |  Fermyon Spin |
|---|---|---|
Price | Free | Free + Paid |
Best For | Hosting & Deployment | API Tools |
Rating | —/100 | 76/100 |
| Feature | WinterJS | Fermyon Spin |
|---|---|---|
| Pricing Model | Free | Freemium |
| Editorial Score | — | 76 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | Hosting & DeploymentServerless | API ToolsLow-Code Backend |
How WinterJS and Fermyon Spin Compare
WinterJS
Blazing-fast JavaScript server for Service Workers, built for high performance.
Free
Fermyon Spin
Framework for serverless WebAssembly applications
Free tier available · 76/100 score
WinterJS is a hosting & deployment tool. Fermyon Spin is in api tools.
Who Should Use What?
On a budget?
WinterJS is free. Fermyon Spin is freemium.
Go with: WinterJS
Want the highest-rated option?
Fermyon Spin scores 76/100. WinterJS is unrated.
Go with: Fermyon Spin
Value user reviews?
Neither has user reviews yet.
Go with: Fermyon Spin
3 Questions to Help You Decide
What's your budget?
WinterJS is free. Fermyon Spin is freemium. Go with WinterJS if free matters most.
What's your use case?
WinterJS is a hosting & deployment tool. Fermyon Spin is in api tools. Pick the category that matches your needs.
How important are ratings?
Not all tools have been rated yet.
Key Takeaways
Fermyon Spin
- Higher score: 76/100 vs unrated
- Free tier available
- Our pick for this comparison
WinterJS
- Completely free
- Better fit for hosting & deployment
The Bottom Line
Fermyon Spin (76/100) is our pick. That said, WinterJS is free — hard to beat on price.
Frequently Asked Questions
Is WinterJS or Fermyon Spin better?
Fermyon Spin scores 76/100 in our evaluation. WinterJS is free and Fermyon Spin is freemium.
What are WinterJS and Fermyon Spin used for?
WinterJS: Blazing-fast JavaScript server for Service Workers, built for high performance.. Fermyon Spin: Framework for serverless WebAssembly applications.
What does WinterJS cost vs Fermyon Spin?
WinterJS is completely free. Fermyon Spin is freemium (free tier + paid plans). Visit their websites for detailed pricing.