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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SuperTokens - Open Source User Authentication - An Alternative to Auth0 / Firebase Auth / AWS Cognito
Cotter - One-click phone number login and checkout
Authpack - Complete user auth system installed with 8 lines of code.
Feather Auth - Build an entire sign-in flow in 5 minutes or less.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.