Fermyon Spin vs Wasmtime: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Fermyon Spin and Wasmtime side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Fermyon Spin
Framework for serverless WebAssembly applications
Best for you if:
- • You want WebAssembly framework
Wasmtime
Fast, secure, and configurable WebAssembly runtime for diverse environments.
Best for you if:
- • You want a fully free tool (Fermyon Spin requires payment)
| At a Glance | Fermyon Spin | Wasmtime |
|---|---|---|
Starts at | Free plan, paid from $19.38/mo, billed monthly Growth plan | Free 100% free |
Category | Cloud & Infrastructure Serverless | Cloud & Infrastructure Developer Tools |
Rating | n/a | n/a |
Free plan | Yes | Yes |
Watch out for | No explicit mention of data transfer costs beyond bandwidth. | n/a |
Choose Fermyon Spin or Wasmtime?
Choose Fermyon Spin if
- You want WebAssembly framework
- You want good for serverless
Choose Wasmtime if
- You want a fully free tool (Fermyon Spin requires payment)
- You want high performance due to optimized code generation
- You want enhanced security through rigorous development practices and Rust's safety
In-Depth Analysis
Fermyon Spin
Framework for serverless WebAssembly applications
The pricing for Fermyon Spin is quite generous, especially with its robust free Starter tier.
Watch out
No explicit mention of data transfer costs beyond bandwidth.
Strengths
- Pro: WebAssembly framework
- Pro: Good for serverless
- Pro: Active development
- Pro: Good DX
- Pro: Open source
Weaknesses
- Con: Newer platform
- Con: Learning curve
- Con: Limited ecosystem
- Con: Still maturing
- Con: WASM limitations
Key features
Wasmtime
Fast, secure, and configurable WebAssembly runtime for diverse environments.
Wasmtime's pricing is exceptionally generous as it is entirely free.
Strengths
- Pro: High performance due to optimized code generation
- Pro: Enhanced security through rigorous development practices and Rust's safety
- Pro: Flexible configuration for various environments
- Pro: Broad language support for integration
- Pro: Adherence to WebAssembly standards and active participation in its evolution
Weaknesses
- Con: Requires some familiarity with WebAssembly concepts for optimal use
- Con: Installation involves command-line steps for some operating systems
Key features
Plans and prices: Fermyon Spin vs Wasmtime
| Tool | Plans and prices | Source |
|---|---|---|
| Fermyon Spin |
| fermyon.com/pricing read Sep 28, 2026 |
| Wasmtime |
| wasmtime.dev read Oct 2, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Fermyon Spin pricing and Wasmtime pricing.
Key Takeaways
Fermyon Spin
- Choose if you want framework for serverless WebAssembly applications
Wasmtime
- Choose if you want fast, secure, and configurable WebAssembly runtime for diverse environments
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Fermyon Spin starts at $19.38/mo, billed monthly; Wasmtime has no public paid plan price on file.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Fermyon Spin and Wasmtime compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Fermyon Spin starts at $19.38/mo, billed monthly; Wasmtime has no public paid plan price on file. Both have a free plan.
What are Fermyon Spin and Wasmtime used for?
Fermyon Spin: Framework for serverless WebAssembly applications. Wasmtime: Fast, secure, and configurable WebAssembly runtime for diverse environments.
What does Fermyon Spin cost vs Wasmtime?
Fermyon Spin's cheapest paid plan is Growth at $19.38/mo, billed monthly; it also has a free plan. Wasmtime is free. Prices read on the vendors' pricing pages, latest check Oct 2, 2026.
What's the main difference between Fermyon Spin and Wasmtime?
Fermyon Spin's main strength: WebAssembly framework. Wasmtime's main strength: high performance due to optimized code generation.