Stack Auth

Stack Auth is a comprehensive open-source authentication platform that provides everything you need for user authentication and management. Built as a developer-friendly alternative to Auth0 and Clerk, it offers a complete suite of tools to handle login, signup, and user management with minimal setup.

Key Features:

• Complete Authentication Suite - Password authentication, SSO, 2FA, and OAuth integrations
• Organizations & Teams - B2B customer management with email invitations and team components
• Permissions & RBAC - Define custom permission trees and organization-wide roles
• Third-party OAuth - Seamless integration with Gmail, OneDrive, and other services
• User Impersonation - Debug issues and assist customers by impersonating users
• Flexible UI Options - Use pre-built shadcn/ui components or build custom interfaces with headless SDK

Developer Benefits:

• No JWT Setup Required - Automatic JWT and access token management
• REST API - Build custom frontends and backends with client and server APIs
• Webhook Support - Sync with Slack, databases, and other services
• Quick Setup - Get started in minutes with npx @stackframe/init-stack@latest

The platform combines the flexibility of open-source software with enterprise-grade features, making it perfect for startups and established companies alike. With active community support and continuous feature updates, Stack Auth provides a reliable foundation for any application requiring user authentication.