Stack Auth is described as 'Stack is an open-source, self-hostable, and highly customizable authentication and user management system' and is a identity management tool in the development category. There are more than 25 alternatives to Stack Auth for a variety of platforms, including Web-based, SaaS, Self-Hosted, Mac and Android apps. The best Stack Auth alternative is VoidAuth, which is both free and Open Source. Other great apps like Stack Auth are Keycloak, ZITADEL , AuthKit and Hanko.
Open-source authentication and user management platform offering passkey-based SSO, centralized login, user invitations, self-registration, and email integration for self-hosted deployments. Emphasizes privacy, admin and user ease, local data control, and strong security.
VoidAuth is the most popular Self-Hosted alternative to Stack Auth.
VoidAuth is the most popular Open Source & free alternative to Stack Auth.
Open Source Identity and Access Management for modern Applications and Services.
Keycloak is the most popular Linux alternative to Stack Auth.
Secure authentication management for your application. Customize as you grow, with easy APIs and programmable workflows. Focus on growing, your login is in good hands.
ZITADEL is the most popular Web-based & SaaS alternative to Stack Auth.
AuthKit is a Radix-powered open source authentication UI built for effortless customizations. User Management is the backend platform handling email verification, account linking, bot blocking, organization modeling, and more.
Hanko is a modern open source Authentication & User Management system – built and hosted in the EU. Alternative to Clerk, Auth0, Stytch, Descope.
Kanidm is an identity management server, acting as an authority on account information, authentication and authorisation within a technical environment.
You can connect any application (written in any language or on any stack) to Auth0 and define its Connection, the method used to authenticate the users of that application:
Clerk is more than a "sign-in box." Integrate complete user management UIs and APIs, purpose-built for React, Next.js, and the Modern Web.
Amazon Cognito lets you add user sign-up/sign-in and access control to your web and mobile apps quickly and easily. Cognito scales to millions of users, and supports sign-in with social identity providers such as FB, Google, and Amazon, and SAML 2.0.
Okta's Workforce and Customer Identity Clouds enable secure access, authentication, and automation—putting identity at the heart of business security and growth.
Okta is the most popular commercial alternative to Stack Auth.
Logto helps you build the sign-in, auth, and user identity within minutes. We provide an OIDC-based identity service and the end-user experience with username, phone number, email, and social sign-in, for web and native apps.
Nubus is a modular open-source solution for centralized identity & access management, providing secure user management, role-based access control, and Single Sign-On (SSO) via a central web portal.
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