OmniAuth is described as 'Flexible authentication system utilizing Rack middleware' and is an app. There are more than 25 alternatives to OmniAuth for a variety of platforms, including Web-based, SaaS, Self-Hosted, Android and iPhone apps. The best OmniAuth alternative is Keycloak, which is both free and Open Source. Other great apps like OmniAuth are Auth0, Clerk Authentication, Logto and Authorizer (authentication).
Auth.js is a runtime agnostic library based on standard Web APIs that integrates deeply with multiple modern JavaScript frameworks to provide an authentication experience that’s simple to get started with, easy to extend, and always private and secure!
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