HybridAuth is described as 'A PHP Library for authentication through Facebook, Twitter, Google, Yahoo, MySpace, LinkedIn, AOL, Vimeo, FourSquare, OpenID and other Identity providers' and is an app in the online services category. There are more than 10 alternatives to HybridAuth for a variety of platforms, including Web-based, Self-Hosted, SaaS, Windows and Linux apps. The best HybridAuth alternative is Keycloak, which is both free and Open Source. Other great apps like HybridAuth are Auth0, Clerk Authentication, Authorizer (authentication) and Logto.