Best 12 Open Source WorkOS Alternatives in 2025

Better Auth is a framework-agnostic authentication library that runs directly in your application. It handles user accounts, login sessions, and security features without relying on external services. You keep full control of your user data because everything runs on your own database and server.

Auth.js is a complete authentication solution that works across different JavaScript frameworks. It provides everything needed to add secure login systems to websites and applications. You can let users sign in through their existing accounts on services like Google or GitHub, or you can use email-based magic links, or even traditional username and password combinations.

Stack Auth is a complete authentication solution that handles all the complex parts of user login and management. When you add it to your application, you get ready-made login pages, account settings, password reset flows, and user dashboards without writing code for these features yourself.

Logto is an authentication and identity management platform that handles user sign-in, permissions, and security for your applications. You can use it as a cloud service or install it on your own servers since it's open-source.

SuperTokens is an authentication framework that handles user login, registration, and session management for your applications. It provides ready-made solutions for email password login, social login through providers like Google and Facebook, passwordless authentication using magic links or one-time codes, and more.

Hanko is a complete authentication platform that handles user login and account management for web and mobile apps. Instead of building login systems from scratch, developers can add Hanko in minutes using ready-made components.

Authentik is a tool that manages how users sign in to your applications and services. Think of it as a central security checkpoint that verifies who someone is before letting them access your systems.

Tesseral is a complete authentication system designed for business-to-business software applications. It handles user login, permission management, and security features so developers can focus on building their main product.

Ory is a complete identity management system that handles user authentication and access control for web and mobile applications. It combines several specialized tools that work together to protect your application and manage who can access what.

Pomerium is a zero trust access proxy that sits between users and internal applications. It verifies identity and permission before allowing access to any resource. The tool works by connecting to your existing identity provider like Google, Okta, Azure, or others.