Wasmtime
A lightweight WebAssembly runtime that is fast, secure, and standards-compliant observed · 2026-08-28
Health v2 · maintenance only
95/100
- Activity 99
- Release rhythm 87
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 1.0
- age_days: 3291
- days_rel: 9
- days_push: 7
- n_releases_24m: 101
Adoption not part of the score
18570 stars · 1807 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Wasmtime is a standalone WebAssembly runtime built on the Cranelift code generator, usable both as a CLI and as an embeddable library. It supports WASI and the Component Model with a focus on speed, security, and standards compliance.
Use cases
- run webassembly modules outside the browser
- embed a wasm runtime in my application
- execute wasi programs from the command line
- sandbox untrusted code with wasm
- compile wasm ahead-of-time for fast startup
- run webassembly components on linux windows and macos
When to choose
- you need a fast, secure, standards-compliant wasm runtime
- you want to embed wasm execution in Rust, C, Python, Go, or .NET apps
- you need WASI or Component Model support
- you want ahead-of-time compilation and low-overhead instantiation
When to avoid
- you need to run wasm in a web browser (use the browser's built-in engine)
- you need JavaScript-specific wasm tooling rather than a runtime
- you require a runtime written in a language other than Rust for your stack
Facets
library · maturity stable
wasm interpreter cli compiler developer-tools compilers security cross-platform windows rust cli cross-platform wasm webassembly wasi component-model cranelift aot bytecode-alliance sandboxing embeddable jit sandbox linux macos
4 sources
- readme: https://github.com/bytecodealliance/wasmtime · fetched 2026-08-28 · 6d16e78aff46
- homepage: https://wasmtime.dev/ · fetched 2026-08-29 · dca95fadf995
- site_page: https://docs.wasmtime.dev/ · fetched 2026-08-29 · 506c2e1994af
- registry_crates: https://crates.io/api/v1/crates/wizer · fetched 2026-08-29 · a6a3cfb1f42b
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| bytecodealliance/wasmtime | main | 95 |
| bytecodealliance/cranelift | mirror | 10 |
| bytecodealliance/wizer | mirror | 74 |
For agents
markdown · JSON · MCP: product_card(name="bytecodealliance/wasmtime")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem