# async-rs/async-std

Async version of the Rust standard library

Repository: https://github.com/async-rs/async-std
Canonical: https://ross.abutalabs.com/products/async-std
Homepage: https://async.rs
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: async-std, rust, async, async-await, async-rust
Last push: 2025-08-15T01:44:24+00:00

## Health v2 (maintenance only)
Score: 42/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 36, release rhythm 16, longevity 100
- inputs: {"age_days": 2582, "days_push": 384, "days_rel": 536, "gap_med": 175, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4066, forks 340 (observed 2026-08-28T04:08:34.107393+00:00)

## What it is
async-std is a Rust crate providing an async version of the Rust standard library, with async/await-compatible APIs for tasks, networking, and file access. It has been officially discontinued and deprecated in favor of the smol project.

## Use cases
- write async Rust code with std-like APIs
- run async tasks with an executor in Rust
- async networking and file I/O in Rust
- learn async/await in Rust with familiar stdlib interfaces
- maintain legacy Rust code that depends on async-std

## When to choose
- you are maintaining an existing codebase already built on async-std
- you need stdlib-parity async APIs in a legacy Rust project

## When to avoid
- you are starting a new Rust project - use smol or tokio instead
- you need a maintained async runtime with ongoing support
- you want long-term ecosystem compatibility

## Facets
- artifact type: library
- maturity: abandoned
- function: concurrency, developer-tools
- domain: developer-tools, programming-languages
- platform: rust, cross-platform
- tags: async-runtime, async-await, deprecated, rust-library, executor

## Member repositories
- async-rs/async-std (main) score 42

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:34.107393+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 2026-08-29T18:23:33.006452+00:00, confidence not recorded.
  - readme: https://github.com/async-rs/async-std (fetched 2026-08-28T04:08:34.107393+00:00, sha 196cbb8cc942)
  - homepage: https://async.rs (fetched 2026-08-29T09:15:40.337156+00:00, sha 625059743cad)
  - registry_crates: https://crates.io/api/v1/crates/async-std (fetched 2026-08-29T09:15:40.345985+00:00, sha 7b54f5d55659)
- Data as of 2026-08-30T08:39:29.467469+00:00.