# omniauth/omniauth

OmniAuth is a flexible authentication system utilizing Rack middleware.

Repository: https://github.com/omniauth/omniauth
Canonical: https://ross.abutalabs.com/products/omniauth
Language: Ruby
License: MIT
License Family: permissive
Topics: omniauth, authentication, hacktoberfest, ruby
Last push: 2026-02-27T14:56:33+00:00

## Health v2 (maintenance only)
Score: 69/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 69, release rhythm 50, longevity 100
- inputs: {"age_days": 6000, "days_push": 187, "days_rel": 336, "gap_med": 0, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8100, forks 977 (observed 2026-08-28T04:10:12.708843+00:00)

## What it is
OmniAuth is a Ruby library that standardizes multi-provider authentication for web applications via Rack middleware. Developers add authentication strategies (Facebook, LDAP, etc.) as individual gems that plug into a unified interface.

## Use cases
- add social login to a Ruby web app
- authenticate users via multiple providers like Facebook or LDAP
- standardize OAuth authentication across a Sinatra or Rails application
- swap authentication providers without changing app code
- implement single sign-on with community strategies

## When to choose
- you are building a Ruby/Rack web application needing third-party authentication
- you want a provider-agnostic auth layer with a large ecosystem of strategy gems
- you need flexible, minimal middleware rather than a full auth framework

## When to avoid
- you need full user management like registration, password reset, and sessions (consider Devise)
- you are not using Ruby or a Rack-based framework
- you need a fully self-contained authentication solution out of the box

## Facets
- artifact type: library
- maturity: stable
- function: auth, middleware, web-framework
- domain: web-development, security, backend
- platform: ruby
- tags: rack-middleware, oauth, multi-provider-authentication, rubygems, strategies, web-server

## Member repositories
- omniauth/omniauth (main) score 69

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:12.708843+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 2026-08-29T17:30:42.706188+00:00, confidence not recorded.
  - readme: https://github.com/omniauth/omniauth (fetched 2026-08-28T04:10:12.708843+00:00, sha c071cd416717)
- Data as of 2026-08-30T08:39:29.467469+00:00.