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
Two Factor Auth (2FA) - List of websites and whether or not they support 2FA
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TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type