wasmi-labs/wasmi

Health v2 · maintenance only

Adoption not part of the score

2173 stars · 360 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Wasmi is an efficient, lightweight WebAssembly interpreter written in Rust, focused on constrained and embedded (no_std) environments. It offers 100% Wasm spec testsuite compliance, fuel metering, sandboxed deterministic execution, and an API loosely mirroring Wasmtime for drop-in replacement.

Use cases

• run webassembly modules on embedded systems
• sandbox untrusted wasm code safely
• embed a wasm interpreter in a rust application
• replace wasmtime with a lighter interpreter
• execute wasm with fuel metering for metered execution
• run webassembly in no_std environments

When to choose

• you need a lightweight, audited wasm interpreter for embedded or constrained targets
• you want deterministic, sandboxed wasm execution with fuel metering
• you need a Wasmtime-like API without a JIT compiler

When to avoid

• you need maximum wasm execution throughput, where a JIT compiler like Wasmtime is faster
• you need a full wasm runtime with extensive host tooling beyond interpretation

Facets

library · maturity active

interpreter wasm security embedded web-development embedded-systems developer-tools security rust embedded cross-platform wasm wasm-runtime virtual-machine fuel-metering no-std wasi drop-in-wasmtime-replacement sandbox no_std

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