# librariesio/libraries.io

:books: The Open Source Discovery Service

Repository: https://github.com/librariesio/libraries.io
Canonical: https://ross.abutalabs.com/products/librariesio
Homepage: https://libraries.io
Language: Ruby
License: AGPL-3.0
License Family: copyleft
Topics: discovery, dependencies, open-source, search, package-manager, rails
Last push: 2026-08-05T13:41:54+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 96, release rhythm 35, longevity 100
- inputs: {"age_days": 4355, "days_push": 28, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1156, forks 211 (observed 2026-08-28T04:03:48.084850+00:00)

## What it is
Libraries.io is an open source discovery service that indexes millions of packages across 32 package managers, letting developers search and track open source libraries and their dependencies. The repository contains the Ruby on Rails application powering the website and its free public data API.

## Use cases
- find open source libraries for a task
- search packages by license or language
- track dependencies of projects I rely on
- get package metadata via an API
- discover trending or popular open source packages
- monitor new releases of packages I depend on

## When to choose
- you need a searchable index of packages across many package managers
- you want package metadata through a free REST API
- you want to self-host an open source package discovery service

## When to avoid
- you need curated, validated package security data for enterprise decisions
- you only need packages from a single ecosystem's native registry
- you need high-volume API access beyond the 60 requests/minute rate limit

## Facets
- artifact type: service
- maturity: active
- function: search-engine, web-scraping, api-framework, developer-tools
- domain: developer-tools, apis
- platform: ruby, self-hosted
- tags: package-registry, dependency-tracking, rails, open-source-discovery, package-metadata, search, open-source, web-server

## Member repositories
- librariesio/libraries.io (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:48.084850+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 2026-08-30T06:32:08.411767+00:00, confidence not recorded.
  - readme: https://github.com/librariesio/libraries.io (fetched 2026-08-28T04:03:48.084850+00:00, sha a967567f3ae2)
  - homepage: https://libraries.io (fetched 2026-08-29T12:37:20.034017+00:00, sha 5d154578f75c)
  - site_page: https://libraries.io/about (fetched 2026-08-29T12:37:20.043350+00:00, sha a0a2e2444485)
  - site_page: https://libraries.io/api (fetched 2026-08-29T12:37:20.045488+00:00, sha 1047708cad28)
- Data as of 2026-08-30T08:39:29.467469+00:00.