Rauthy is a lightweight and easy to use Identity Provider supporting OpenID Connect, OAuth 2.0 and PAM. It aims to be simple to both set up and operate, with very secure defaults and lots of config options, if you need the flexibility.


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 Keycloak, which is both free and Open Source. Other great apps like Stack Auth are AuthKit, ZITADEL , Hanko and Kanidm.
Rauthy is a lightweight and easy to use Identity Provider supporting OpenID Connect, OAuth 2.0 and PAM. It aims to be simple to both set up and operate, with very secure defaults and lots of config options, if you need the flexibility.


No-code authentication service. Octauthent can help you secure any website with a login form, without a single line of code.




FusionAuth is an auth for any app. Get everything you need for secure registration and user management in minutes. Single-tenant, on-prem or private cloud, custom emails with localization, social login, and more.




FusionAuth is the most popular Windows & Mac alternative to Stack Auth.
Frontegg is a developer platform that enables product-led-growth through a customer-facing user-management interface embedded seamlessly within any product.




Ory builds cloud-native authentication (login), authorization (permission), delegation (OAuth2, OpenID Connect), and user management software. You can deploy what you need yourself or use the Ory Network and get started in minutes.
Ory is the most popular Android, iPhone & iPad alternative to Stack Auth.
Identity Cloud is a full end-to-end identity as a service (IDaaS) CIAM solution that enables companies to implement enterprise-grade identity management in a fast, flexible way. Engineered with a cloud-native architecture, the solution intelligently scales with application...
HelloID is a cloud-based Identity & Access Management (IAM) solution. It has functionality that includes automated self service, provisioning, password reset, among other modules.
Userfront makes it easy to add authentication, access control, SSO, and multi-tenancy to any web application.



SuperTokens is an open source user authentication solution. Using SuperTokens, developers can add secure, hassle free auth to their mobile application or website in less than a day. It is an alternative to Auth0, Firebase Auth and AWS Cognito.




MojoAuth is the safest passwordless authentication solution that enables your users to login seamlessly with an email OTP or magic link or WebAuthn, which in turn provides stronger security to your business.




JustAuthenticateMe offers a simple authentication-as-a-service for your web apps. It uses magic links in emails as a way to verify identity so that neither you nor your users have to worry about passwords.



