# bytecodealliance/lucet

Lucet, the Sandboxing WebAssembly Compiler.

Repository: https://github.com/bytecodealliance/lucet
Canonical: https://ross.abutalabs.com/products/lucet
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: webassembly, wasi, assemblyscript, rust, wasm
Archived: true
Last push: 2022-03-23T22:18:15+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2826, "days_push": 1624, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4045, forks 166 (observed 2026-08-28T04:08:33.580741+00:00)

## What it is
Lucet is a native WebAssembly ahead-of-time compiler and runtime for safely executing untrusted Wasm programs inside applications, built on the Cranelift code generator. It has reached end-of-life and users should migrate to Wasmtime, which now includes all of Lucet's features.

## Use cases
- run untrusted webassembly programs safely in my application
- aot compile wasm to native code
- sandbox wasm execution with low overhead
- embed a wasm runtime in a rust service
- compile wasi modules to native binaries

## When to choose
- you are maintaining a legacy system already built on Lucet
- you need to study its AOT compilation and pooling allocator design

## When to avoid
- starting any new project - use Wasmtime instead
- you need ongoing maintenance, security fixes, or new features
- you need pooling userfaultfd-based memory allocation, which Wasmtime now provides

## Facets
- artifact type: library
- maturity: abandoned
- function: compiler, interpreter, security, wasm
- domain: compilers, security, web-development, developer-tools
- platform: rust, cli
- tags: webassembly, wasi, aot-compilation, wasm-runtime, end-of-life, wasmtime-successor, sandboxing, linux, macos

## Member repositories
- bytecodealliance/lucet (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:33.580741+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:23:43.737651+00:00, confidence not recorded.
  - readme: https://github.com/bytecodealliance/lucet (fetched 2026-08-28T04:08:33.580741+00:00, sha 0fd525701717)
- Data as of 2026-08-30T08:39:29.467469+00:00.