WebAssembly (Wasm) Runtimes, Tools & Platforms (2026) | Wasmtime, WasmEdge, Wasmer, WASI, Spin & wasmCloud

Standards & Learning

15 entries

The specification, WASI and where to learn.

01WebAssembly.orgOfficial site of the WebAssembly community group. 02WebAssembly core specificationThe W3C core specification (version 2). 03Specification repositorySource of the specification and reference interpreter. 04Feature supportWhich WebAssembly features each engine supports. 05ProposalsPhases and status of feature proposals such as threads, GC and memory64. 06WASIWebAssembly System Interface, for running Wasm outside the browser. 07WASI repositoryWASI specifications and proposals. 08Component ModelDocumentation for composing Wasm components across languages. 09Component Model specificationSource of the component model proposal. 10Bytecode AllianceNonprofit that stewards Wasmtime, WASI tooling and the component model. 11MDN WebAssemblyGuides and reference for WebAssembly in the browser. 12Wasm by ExampleHands-on examples in several languages. 13Can I use WebAssemblyBrowser support tables. 14WebAssembly securityThe security model and sandboxing guarantees. 15Awesome WasmCommunity-curated list of WebAssembly resources.

Runtimes

9 entries

Engines that run Wasm modules and components outside the browser.

16WasmtimeBytecode Alliance runtime with strong WASI and component model support. 17WasmEdgeCNCF runtime aimed at cloud-native, edge and AI inference workloads. 18WasmerRuntime and package registry with several compiler backends. 19wazeroZero-dependency runtime for Go programs. The GitHub repository now lives under the wazero organization, having moved from tetratelabs. 20WAMRWebAssembly Micro Runtime for small and embedded devices. The repository moved from the bytecodealliance organization. 21wasm3Fast interpreter for constrained devices. 22WasmiEfficient WebAssembly interpreter written in Rust. 23Node.js WASIWASI support built into Node.js. 24Deno WebAssemblyUsing Wasm modules in Deno.

Compilers & Toolchains

19 entries

Turn your code into Wasm and inspect the result.

25EmscriptenCompiler toolchain from C and C++ to WebAssembly. 26wasi-sdkClang-based toolchain for compiling C and C++ to WASI. 27wasm-bindgenRust and JavaScript interop. It moved to its own GitHub organization after the rustwasm organization was sunset in 2025. 28wasm-packBuilds and packages Rust-generated Wasm for the web; now maintained under the wasm-bindgen organization. 29Rust rustwasm sunset noticeRust blog post on the end of the rustwasm GitHub organization. 30TinyGoGo compiler for small targets including WebAssembly and WASI. 31AssemblyScriptTypeScript-like language that compiles to WebAssembly. 32BlazorMicrosoft's .NET web UI framework, which can run in the browser on WebAssembly. 33Kotlin/WasmKotlin support for WebAssembly. 34PyodideCPython compiled to WebAssembly for the browser. 35GrainProgramming language designed for WebAssembly. 36BinaryenCompiler and optimizer infrastructure, including wasm-opt. 37WABTWebAssembly Binary Toolkit: wat2wasm, wasm2wat and more. 38wasm-toolsRust tools for parsing, printing, validating and composing Wasm. 39jcoToolchain for JavaScript and Wasm components. 40componentize-pyBuild Wasm components from Python. 41cargo-componentCargo subcommand for building Wasm components in Rust. The last commit was in July 2025, so check current guidance in the Component Model docs. 42JavyRuns JavaScript on Wasm by compiling it into a module. 43Wasmer JavaScript SDKRun Wasm and WASIX packages from JavaScript; formerly the wasmer-js repository.

Serverless, Edge & Cloud-Native

9 entries

Platforms that run Wasm as functions or services.

44SpinFramework for building and running event-driven Wasm microservices. 45SpinKubeRun Spin applications on Kubernetes. 46wasmCloudCNCF platform for distributed WebAssembly applications. 47FermyonMaker of Spin. Akamai announced in December 2025 that it had acquired Fermyon, and fermyon.com now redirects to Akamai Functions. 48Cloudflare Workers WebAssemblyUsing Wasm modules inside Cloudflare Workers. 49Fastly ComputeFastly's edge platform that runs Wasm-compiled code. 50runwasicontainerd shim library for running Wasm workloads under Kubernetes and containerd. 51containerd Wasm shimsShims for running Spin and other Wasm apps in containerd. The repository was archived by its owner in July 2025. 52Docker and WasmDocker Desktop's Wasm support documentation.

Plugins & Extensibility

6 entries

Use Wasm as a safe plugin format.

53ExtismFramework for running Wasm plugins inside an application from many host languages. 54Proxy-WasmABI specification for Wasm extensions in proxies such as Envoy. 55Proxy-Wasm Rust SDKWrite proxy filters in Rust. 56Proxy-Wasm Go SDKWrite proxy filters in Go with TinyGo. 57Istio WasmPluginIstio resource for loading Wasm extensions into Envoy proxies. 58EnvoyProxy that hosts Wasm extensions.

Browser, Data & AI Applications

6 entries

Wasm powering applications.

59SQLite WasmOfficial SQLite build for the browser. 60DuckDB-WasmDuckDB running in the browser. 61ONNX Runtime WebRun ONNX models in the browser with Wasm and WebGPU backends. 62WebLLMIn-browser LLM inference engine from MLC. 63whisper.cppSpeech recognition with a WebAssembly build for the browser. 64Figma on WebAssemblyFigma's account of using WebAssembly to speed up loading.

8 entries

Neighbouring pages on this site.

65Serverless at the EdgeEdge function platforms. 66FaaS on KubernetesFunction platforms on Kubernetes. 67Serverless ComputingServerless hub. 68Edge ComputingEdge computing hub. 69Cloud NativeCloud-native hub. 70Container EnginesContainer runtimes. 71JavaScript ML LibrariesMachine learning in the browser. 72Software EngineeringSoftware engineering hub.

Frequently Asked Questions

What is WebAssembly?

WebAssembly (Wasm) is a compact binary instruction format that runs in a sandbox at near-native speed. It was designed for browsers and now also runs on servers, at the edge and on embedded devices through runtimes.

What is WASI?

The WebAssembly System Interface gives Wasm modules a standard way to use files, clocks, networking and other system features outside the browser, without tying them to one operating system.

What is the Component Model?

A proposal for composing Wasm components written in different languages through typed interfaces, so they can be linked without custom glue code. Check the Component Model docs for current status.

Which runtime should I choose?

It depends on the workload. Wasmtime emphasizes standards support, WasmEdge targets cloud-native and AI workloads, Wasmer offers a package ecosystem, wazero suits Go hosts, and WAMR and wasm3 suit small devices. Test your own modules.

Does Wasm replace containers?

Not in general. Wasm modules start quickly and are sandboxed, but ecosystem support differs from containers, so many teams run both, for example through containerd shims or Kubernetes projects such as SpinKube.

How current is this page?

Links and project activity were checked in October 2026. WebAssembly standards, runtimes and hosted platforms change quickly, so confirm details in each project's own documentation. Sites that block automated checks are kept and may need a manual click.