Spin is an open source framework for building and running serverless applications powered by WebAssembly.
Spin addresses the challenge of developing microservices that are fast, secure, and composable by leveraging WebAssembly as the runtime foundation. It builds on the WebAssembly component model and the Wasmtime runtime to provide a complete developer experience. The framework offers a CLI tool that handles the full lifecycle of applications: creation from templates, building, distribution, and execution. Developers write components in their language of choice, compile them to WebAssembly, and Spin orchestrates their deployment and runtime behavior.
Spin suits teams wanting to adopt WebAssembly for cloud microservices without deep infrastructure expertise. The framework is designed as an entry point to WebAssembly development, offering SDKs for Rust, JavaScript, Go, and Python as first-class options, with additional language support available through community contributions. It works well for projects that benefit from WebAssembly's security model and resource efficiency, particularly serverless and containerized deployments. The tool provides a straightforward path from local development through the quickstart guide to production deployment.
The project maintains active development with regular updates to its core runtime and SDK support. The framework team directly supports four language SDKs while welcoming and acknowledging community-maintained integrations for additional languages. Documentation is comprehensive, covering installation, quickstart workflows, and language-specific guides for each supported SDK. The project maintains public build status tracking and participates in open source best practices initiatives.
