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OmniAuth is a flexible authentication system utilizing Rack middleware.
Auth0 provides a comprehensive platform for authentication and authorization.
Free tier available. Paid plans start at $23/month.
Firebase Authentication provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users to your app.
Free tier available, pay as you go pricing for higher usage
Authentic is a modern authentication and authorization service for web and mobile apps.
Free tier available
OAuth.io is a service that simplifies OAuth integration into your application with a unified API.
Free trial available. Pricing starts at $29/month.
Okta is an identity management service that helps companies manage and secure user authentication into modern applications.
Custom pricing based on requirements
Mozilla Persona was a decentralized authentication system for the web, but it was discontinued in 2016.
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