Cotter

One-click phone number login and checkout

12 Alternatives To Cotter

Alloy

API service and dashboard for identity verification
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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.
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Auth0

Auth0 is a program for people to get authentication and authorization services for their own business use.
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Authentiq

Strong authentication, without the passwords

Authpack

Complete user auth system installed with 8 lines of code.
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Authy

Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.

DAuth

Authentication for the decentralized web in 60 seconds
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Firebase Authentication

Application and Data, Application Utilities, and User Management and Authentication

JSON Web Token

JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties.

OAuth2

Application and Data, Application Utilities, and User Management and Authentication

Spring Security

The Spring portfolio has many projects, including Spring Framework, Spring IO Platform, Spring Cloud, Spring Boot, Spring Data, Spring Security…

TelegramLogin

Authenticate users via Telegram Messenger