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Stack

Stack Auth is an open-source authentication platform that serves as a developer-friendly alternative to Auth0 and Clerk, designed specifically for Next.js, React, and JavaScript applications.

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Stack — preview
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Stack auth
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stack-auth/stack (opens in a new tab)

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About

About Stack Auth

This comprehensive authentication solution provides everything needed for user management including OAuth integration with popular providers (Google, GitHub, Microsoft), magic link authentication, passwordless login with passkeys, multi-tenancy support for serving multiple organizations, role-based access control (RBAC) for granular permissions, and automatic email notifications for user actions. The platform can be set up in just five minutes and offers both managed cloud hosting and self-hosting options, giving teams complete control over their authentication infrastructure.

Built with developer experience in mind, Stack Auth includes pre-built UI components styled with shadcn/ui, TypeScript SDK for type-safe integration, webhook support for custom workflows, and comprehensive session management. Perfect for startups and enterprises building SaaS applications, the platform eliminates the complexity of authentication while remaining extensible and customizable, allowing developers to add authentication to their Next.js applications without vendor lock-in or hefty monthly fees, while maintaining full ownership of user data and authentication flows.

Get started

Free, open source, and ready to ship.

Clone the repo, install dependencies, and start customising. Stack Auth is free and open source: its license is in the repository.

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  1. Clone the Stack Auth repository from GitHub.
  2. Run npm install or pnpm install to install all required packages.
  3. Run npm run dev to start the development server and begin customizing.
  4. Check the repository’s README and license before you ship.

Terminal

$ git clone https://github.com/stack-auth/stack
$ cd stack
$ npm install
$ npm run dev

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$789 billed yearly · ≈ $13/dev/mo

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  • How many people can use the license.Seats: Up to 5 seats
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$1,589 billed yearly

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