Spin vs Fly.io: Which Should You Choose in 2026?
Choosing between Spin and Fly.io 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:
Spin
Build and run event-driven microservices with WebAssembly for speed and portability.
Best for you if:
- • Builds event-driven microservices with WebAssembly (Wasm).
- • Offers millisecond cold start times and high portability.
Fly.io
Deploy apps close to users on edge infrastructure
Best for you if:
- • You want the higher-rated option (8.6/10 vs 0.0/10)
- • Fly.io is a platform for deploying applications globally on servers close to users
- • It runs Docker containers, databases, and full-stack apps on edge infrastructure
| At a Glance |  Spin |  Fly.io |
|---|---|---|
Price | Free + Paid | Free + Paid |
Best For | Hosting & Deployment | Hosting & Deployment |
Rating | —/100 | 86/100 |
| Feature | Spin | Fly.io |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| Editorial Score | — | 86 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | Hosting & DeploymentServerless | Hosting & DeploymentCDN |
How Spin and Fly.io Compare
Spin
Build and run event-driven microservices with WebAssembly for speed and portability.
Free tier available
Fly.io
Deploy apps close to users on edge infrastructure
Free tier available · 86/100 score
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Spin
Want the highest-rated option?
Fly.io scores 86/100. Spin is unrated.
Go with: Fly.io
Value user reviews?
Neither has user reviews yet.
Go with: Fly.io
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Both are hosting & deployment tools. Compare their specific features to decide.
How important are ratings?
Not all tools have been rated yet.
Key Takeaways
Fly.io
- Higher score: 86/100 vs unrated
- Free tier available
- Our pick for this comparison
Spin
The Bottom Line
Fly.io (86/100) is our pick.
Frequently Asked Questions
Is Spin or Fly.io better?
Fly.io scores 86/100 in our evaluation. Both are freemium.
What are Spin and Fly.io used for?
Spin: Build and run event-driven microservices with WebAssembly for speed and portability.. Fly.io: Deploy apps close to users on edge infrastructure.
What does Spin cost vs Fly.io?
Spin is freemium (free tier + paid plans). Fly.io is freemium (free tier + paid plans). Visit their websites for detailed pricing.