Amazon Cognito is described as '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' and is a identity management tool in the network & admin category. There are more than 50 alternatives to Amazon Cognito for a variety of platforms, including Web-based, SaaS, Self-Hosted, Mac and Windows apps. The best Amazon Cognito alternative is Keycloak, which is both free and Open Source. Other great apps like Amazon Cognito are AuthKit, ZITADEL , authentik and Hanko.