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Spin

Spin is an open-source framework designed for developing and executing event-driven microservice applications using WebAssembly (Wasm) components.

PaidPrice verified 2026-10-05Visit site ↗
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Our verdict

Who it's for

Build and run event-driven microservices with WebAssembly for speed and portability.

Who should look elsewhere

Requires understanding of WebAssembly concepts for optimal use.

Pros

  • +Achieves extremely fast cold start times for applications.
  • +Provides a secure and isolated execution environment through Wasm sandboxing.
  • +Allows developers to use familiar programming languages with Wasm.
  • +Ensures high portability across diverse deployment environments due to open standards.
  • +Reduces operational overhead by eliminating the need to keep applications 'warm'.

Cons

  • −Requires understanding of WebAssembly concepts for optimal use.
  • −As a CNCF sandbox project, it may still be evolving with potential API changes.

Key features

  • ✓Event-driven microservice architecture
  • ✓WebAssembly (Wasm) component support
  • ✓Sandboxed execution environment
  • ✓Portable application deployment
  • ✓Millisecond cold start times
  • ✓Multi-language support via Wasm implementations
  • ✓Open-source Cloud Native Computing Foundation (CNCF) project
  • ✓Deployment options for local, self-hosted, Kubernetes, and cloud environments

Pricing

PlanPriceBillingNotes
Wasm Functions—monthFast and powerful engine for hosting serverless functions; Running on Akamai Cloud; Distributed cloud platform
Cloud—monthSimple way to deploy and run Spin apps on Fermyon’s hosted service; Offers free and paid levels, depending on request volume
Platform for Kubernetes—monthEnterprise solution for Wasm workloads in Kubernetes; In your cloud or on-prem; High density, efficient compute

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