# smol-rs/smol

A small and fast async runtime for Rust

Repository: https://github.com/smol-rs/smol
Canonical: https://ross.abutalabs.com/products/smol
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: rust, async, networking, concurrency, futures, runtime
Last push: 2026-08-03T14:58:46+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 95, release rhythm 8, longevity 100
- inputs: {"age_days": 2402, "days_push": 30, "days_rel": 725, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5048, forks 195 (observed 2026-08-28T04:09:08.931218+00:00)

## What it is
smol is a small and fast async runtime for Rust that re-exports a set of composable async crates (executor, I/O, networking, locks, channels). It provides a lightweight alternative to larger runtimes like Tokio.

## Use cases
- run async Rust code with a lightweight runtime
- async TCP/UDP networking in Rust
- async file system operations
- build custom async executors
- run async processes and timers without Tokio

## When to avoid
- your project depends on the Tokio ecosystem of libraries
- you need a runtime with extensive middleware and ecosystem tooling

## Facets
- artifact type: library
- maturity: stable
- function: concurrency, networking, http-client, file-system
- domain: developer-tools, networking, backend
- platform: rust, cross-platform, windows
- tags: async-runtime, futures, executor, lightweight, linux, macos

## Member repositories
- smol-rs/smol (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:08.931218+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 2026-08-29T18:17:22.501276+00:00, confidence not recorded.
  - readme: https://github.com/smol-rs/smol (fetched 2026-08-28T04:09:08.931218+00:00, sha 8dead859071b)
  - registry_crates: https://crates.io/api/v1/crates/smol (fetched 2026-08-29T08:57:48.609124+00:00, sha dbc4db4e7121)
- Data as of 2026-08-30T08:39:29.467469+00:00.