Stack Auth

Open-source authentication suite for user management, teams, and OAuth integration in Next.js apps

stack-auth.com

Verified API available

Quick facts
What is it	Open-source authentication suite for user management, teams, and OAuth integration in Next.js apps
Pricing	Paid — from $49/mo
Free tier	Yes
Platform	Web Application
API	Yes
Best for	Adding user login and registration to a web application, Implementing team-based permissions for a B2B SaaS product
Domain registered	2024

Data updated Aug. 1, 2026

What does Stack Auth do?

Stack Auth is an open-source authentication platform that handles user sign-ups, logins, team management, and third-party OAuth integrations. It provides pre-built UI components for Next.js applications, eliminating the need to build authentication systems from scratch. Developers can implement password-based auth, single sign-on (SSO), and two-factor authentication quickly using Stack Auth's ready-made tools.

The platform stands out with its headless SDK option, allowing developers to use pre-styled shadcn/ui components or build custom interfaces. It handles JSON Web Tokens (JWT) automatically, manages OAuth token refreshes for services like Gmail and OneDrive, and includes organization management features for B2B applications. The tool also offers role-based access control, user impersonation for customer support, and webhook integrations for connecting with other services.

Stack Auth is ideal for developers building Next.js applications who want to avoid the complexity of implementing authentication systems. It's particularly useful for startups and small teams needing enterprise features like organization management and RBAC without the overhead of building them in-house. Real-world use cases include replacing existing auth providers like Clerk, adding team collaboration features to SaaS products, and implementing secure customer portals with granular permissions.

Development — Other

#api#authentication#developer tools#next.js#open source#rbac#user management

Key features

What makes it stand out

Pre-built authentication UI components for Next.js

Organization and team management for B2B applications

Automatic JWT and OAuth token management

Role-based access control and permissions system

User impersonation for debugging and customer support

Who is Stack Auth for?

Who benefits most from this tool

Adding user login and registration to a web application

Implementing team-based permissions for a B2B SaaS product

Managing third-party OAuth connections for user data access

Pricing

Free tier available — start without a credit card

Free

unlimited teams
10,000 users
unlimited projects
1 dashboard admins
0 saml SSO connections
Custom branding
SSO with OIDC/OAuth

Team

$49.0/month

unlimited teams
50,000 users
unlimited projects
3 dashboard admins
0 saml SSO connections
49 additional dashboard admin price
Custom branding
SSO with OIDC/OAuth
Priority support

Growth

$299.0/month

unlimited teams
unlimited users
unlimited projects
5 dashboard admins
3 saml SSO connections
49 additional dashboard admin price
99 additional saml SSO connection price
Custom branding
SSO with OIDC/OAuth
Priority support
Premium support

Trust & presence

Domain Domain registered 2024

Gallery

Click any image to enlarge

Stack Auth — pricing page — Pricing page

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