Authgear is a plug-and-play authentication solution for web and mobile apps. This means your developers and IT team can reliably integrate security features like Passkeys, passwordless logins and multifactor authentication into your apps in as little as 5 minutes.
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Authentiq - Strong authentication, without the passwords
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Cotter - One-click phone number login and checkout
SuperTokens - Open Source User Authentication - An Alternative to Auth0 / Firebase Auth / AWS Cognito
Authpack - Complete user auth system installed with 8 lines of code.
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.