Stack is the open-source authN, authZ, and user management platform.

We build for devs that want to iterate quickly, offering both managed auth and self-hosting. You can set it up in one minute and scale with the project as it grows.

Stack was built by repeat founders with strong technical backgrounds. Check out our GitHub: https://github.com/stack-auth/stack
The open-source Auth0 alternative
Title: Stack Auth: The open-source Auth0 alternative | Y Combinator

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### The open-source Auth0 alternative

Stack is the open-source authN, authZ, and user management platform. We build for devs that want to iterate quickly, offering both managed auth and self-hosting. You can set it up in one minute and scale with the project as it grows. Stack was built by repeat founders with strong technical backgrounds. Check out our GitHub: 



Stack Auth

Founded:2024

Team Size:2

Location:San Francisco

### Active Founders

### Zai Shi, Founder

Building the best user login/management experience for developers, 100% open-source!



### Konstantin Wohlwend, Founder

I build user authentication @ Stack. If you're building a modern web app with user logins, we should chat!  👋



### Company Launches

[### Stack Auth — Open-source user authentication that doesn't suck](

**Docs**: [  
**Star us on GitHub**: [



Hi all! We're [Zai]( and [Konsti]( and we’re repeat founders who believe that devtools must be dev-friendly.

User authentication _sucks_. Existing solutions are a pain to set up and have hostile pricing, terrible documentation, and vendor lock-in. The few good solutions that exist only do authentication and don't even touch **authorization** or **user management**.

Stack Auth was born out of years of frustration. We wanted to build something better.

If you're building B2B software, we'll deal with **organizations**, **permissions**, and **RBAC** for you.

If you're building a Next.js app, we have **React components** for sign-in, password reset flows, and all sorts of things like account settings and teams. And they're customizable.

Other features include:

*   **100% open-source** and self-hostable, though we also provide a Cloud service
*   **User dashboard** to view, modify, and understand your users
*   **Multi-tenancy** for your business customers
*   **Access token management** for APIs of OAuth services that users connect with
*   **Impersonation** to log in as one of your own customers for debugging and live support
*   **Webhooks** to sync your data with other systems like databases or Slack
*   **Customizable e-mails** on triggers such as user sign-up
*   **Flexible REST API** for use with any backend

Interested? Check out [our website]( or [schedule a call]( Or take a look at the screenshots below.

Thanks all!






