Stack
Backed by Y Combinator Logo

Auth can be good.

Stack Auth is the open-source Auth0 alternative.
AuthN, authZ, and user management in just 5 minutes.

Beautiful Next.js integration

We pride ourselves with our lean and responsive design. Your users will love it, and your developers too.

Features Illustration

Features

Authentication

Password, SSO, 2FA, and more

Beautifully styled components to help you get started quickly. No need to worry about design and internal logic.

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Headless or headful UI

Integrate our shadcn/ui components, or build your own with our headless SDK.

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JWTs without the JWTs

Stack manages JWTs and access tokens for you, so you get the performance benefits without ever having to think about them.

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Authorization

Organizations & teams

Manage B2B customers with orgs & teams, supporting email invitations, team components, and management tools.

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Permissions & RBAC

Define arbitrary permission trees and org-wide roles.

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3rd-party OAuth

Access third-party OAuth APIs such as Gmail or OneDrive without having to think about OAuth flows or token refreshes.

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User Management

REST API

Use our client and server APIs to build custom front- and backends.

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Impersonation

Impersonate users to debug issues or help your customers.

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Webhooks

Sync with Slack, your database, or any other service.

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New features every week

We build and ship quickly. Subscribe to our newsletter or read our changelog to get the latest updates.

Here's how we compare

Among its competitors, Stack Auth is unique by being open-source, developer-friendly, and feature-rich.

Stack
vs. Auth0

Stack is built for devs who want to own their auth.
Stack is open-source
Stack is 100% open-source and self-hostable.
Stack is for developers
Stack is built for devs, not enterprises. It's simple to understand, use, and integrate into your Next.js + Postgres tech stack.
Stack has reasonable pricing
Stack grows organically without a marketing budget and sales team, and can afford to be multiple magnitudes cheaper.
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Join the community.

As an open-source project, we rely on organic growth. Here's what our users have to say.

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Lucas
Founder @ QAComet
We were able to replace our Clerk implementation with Stack in a matter of hours. It's empowering to have the flexibility of an open-source alternative with a simple to use interface and a responsive team!
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Guillermo Rauch
Founder & CEO @ Vercel
React <Components /> as the universal integration API — https://stack-auth.com
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Jack Mark
Founder @ EdTech Leaders
I had Stack Auth up and running in no time, and it's exactly what I needed for my project. Anyone else using this for their apps?
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Liam Collins
Founder @ Tailwind Health
It's so easy to get Stack Auth up and running, and the founders are amazing too!
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Stefan S.
CEO @ anomys
Just discovered Stack Auth Is the auth pain finally over ? Or getting close...
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Ken Taylor
I would just like to say Thank you Stack Auth
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M. Russell
Indie dev
Can't wait to rip clerk out of my app 🙂
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Nicola Lanzilotto
Product @ Tiledesk
I'm impressed with Stack Auth's ease of use, customizability, and security features. If you're looking for a reliable and developer-friendly user authentication and authorization solution, Stack Auth is definitely worth considering.
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JuliaMLTools
The experience so far setting up Stack Auth was world class. Good luck guys! And, keep executing on that smooth simplicity!
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Jerad Maplethorpe
Indie maker
Okay but that Stack Auth logo is sick
Managed hosting

Simple plans for everyone

Self-hosting is always free.

Free
Free
For individuals
Get Started ->
Team
$ 49 / mo
For early startups and small teams
Get Started ->
Growth
$ 299 / mo
For growing businesses and teams
Get Started ->
Usage
Usage
Usage
Usage
Monthly active users
10K Monthly active users
50K Monthly active users
Unlimited Monthly active users
Monthly active teams
Unlimited Monthly active teams
Unlimited Monthly active teams
Unlimited Monthly active teams
Number of projects
Unlimited Number of projects
Unlimited Number of projects
Unlimited Number of projects
# of dashboard admins
1 # of dashboard admins
3 (then $49 each) # of dashboard admins
5 (then $49 each) # of dashboard admins
Features
Features
Features
Features
Custom branding
Custom branding
Custom branding
Custom branding
SSO with OIDC/OAuth
SSO with OIDC/OAuth
SSO with OIDC/OAuth
SSO with OIDC/OAuth
# SAML SSO connections
# SAML SSO connections
# SAML SSO connections
3 (then $49 each) # SAML SSO connections
Support
Support
Support
Support
Priority support
Priority support
Priority support
Priority support
Premium support
Premium support
Premium support
Premium support
Getting started with Stack

Everything you need to know

Can I integrate Stack into my existing project?

Yes! It is very straightforward! Stack does not require any special architecture and can merge well into any Next.js project that uses the App router.

How do I sync user data with my database?

For most of the time, you don't need to sync user data with your database. You can store JSON data in the user object itself. However, if you really need to sync data, you can use our webhooks.

Can I deploy Stack on my own servers?

Yes! Stack is fully open-source and you can self-host it on your own servers.

How can I integrate Stack into my backend?

Stack provides a Next.js server side SDK that you can just import and use. If you are using a different language or framework, you can use our REST API.

Does Stack support SSO with SAML?

Yes! Let's get in touch and we can help you.

What kind of support do you offer?

We offer a range of support from data migration to custom on-premise deployments.

The developer-friendly authentication platform

Start building with Stack today

Secure your application with the best open-source authentication and user management platform.