# lycheeverse/lychee

⚡ Fast, async, stream-based link checker written in Rust. Finds broken URLs and mail addresses inside Markdown, HTML, reStructuredText, websites and more!

Repository: https://github.com/lycheeverse/lychee
Canonical: https://ross.abutalabs.com/products/lycheeverse-lychee
Homepage: https://lychee.cli.rs
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: link-checker, link-checking, link-checkers, validator, broken-links, link, check
Last push: 2026-08-25T09:17:21+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 81, longevity 100
- inputs: {"age_days": 2220, "days_push": 8, "days_rel": 124, "gap_med": 0, "n_releases_24m": 30}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3860, forks 227 (observed 2026-08-28T04:08:27.473497+00:00)

## What it is
lychee is a fast, async, stream-based link checker written in Rust that finds broken hyperlinks and mail addresses in Markdown, HTML, reStructuredText, websites, and more. It is available as a CLI tool, a Rust library, a Docker image, and a GitHub Action.

## Use cases
- find broken links in my markdown documentation
- check a website for dead URLs
- validate links in README files in CI
- scan a codebase for broken hyperlinks
- verify email addresses and links in HTML files
- run a link checker as a GitHub Action

## When to choose
- you need fast, async checking of links across large docs, sites, or repos
- you want a single static binary or Docker image that's easy to install in CI
- you need structured JSON output for pipeline integration
- you want to check links in Markdown, HTML, and other file formats

## When to avoid
- you need a GUI-based link checker
- you need deep crawling of dynamic JavaScript-rendered sites
- you need a hosted monitoring service with alerts rather than a CLI tool

## Facets
- artifact type: cli-tool
- maturity: active
- function: cli, developer-tools, testing, ci-cd
- domain: developer-tools, documentation, web-development
- platform: windows, cross-platform, cli
- tags: link-checker, broken-links, rust, markdown, html, github-action, async, command-line, linux, macos, docker

## Member repositories
- lycheeverse/lychee (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:27.473497+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 2026-08-29T18:25:54.028192+00:00, confidence not recorded.
  - readme: https://github.com/lycheeverse/lychee (fetched 2026-08-28T04:08:27.473497+00:00, sha cd09f04b64c4)
  - homepage: https://lychee.cli.rs (fetched 2026-08-29T09:20:24.437530+00:00, sha c67bfae0c210)
  - site_page: https://lychee.cli.rs/guides/getting-started (fetched 2026-08-29T09:20:24.446722+00:00, sha 2e52012b400c)
  - registry_crates: https://crates.io/api/v1/crates/lychee (fetched 2026-08-29T09:20:24.449148+00:00, sha 32029648aa96)
- Data as of 2026-08-30T08:39:29.467469+00:00.