AWS Cognito is described as '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'. There are more than 10 alternatives to AWS Cognito, not only websites but also apps for a variety of platforms, including SaaS, Self-Hosted solutions, Mac and Windows. The best alternative is Keycloak, which is both free and Open Source. Other great sites and apps similar to AWS Cognito are Auth0 (Freemium), FusionAuth (Paid), Okta (Freemium) and Ory (Free, Open Source).
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: • Custom credentials: username + passwords • Social network logins: Google, Facebook, Twitter...
FusionAuth is 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.
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 Cloud Platform and get started in minutes.