The secure, sandboxed interface connecting WebAssembly to your system—powering next-gen applications and tooling.
Write once, deploy anywhere—WASI abstracts system interactions for consistent execution across hardware and platforms.
Run untrusted code securely with fine-grained permissions and full isolation—no system access unless explicitly allowed.
Deliver native performance in browsers with WebAssembly modules interacting with the system via WASI.
Package command-line utilities as WebAssembly modules that run anywhere with WASI support.
Deploy lightweight, secure functions in any cloud environment with guaranteed consistency.
Select your platform for the latest stable release. Need older versions? View archived versions.
Current version 0.15.4 (2025-08)
Looking for enterprise capabilities? We offer security audits, custom integrations, and commercial support. Contact sales.
All WASI components are open source. The community has contributed 2,843 pull requests this quarter.
GitHubThe WebAssembly package manager that works across all WASI-compatible environments.
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