Best Cotter Alternatives & Competitors in 2025

Allow users to login without passwords

paid Free Trial $17.0 / Monthly

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.

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Try for free Open Source freemium

Strong authentication, without the passwords

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

Open Source

Allow your users to sign-in without a password or OTPs

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

2FA codes in your browser, secured by the way you type

Open Source User Authentication - An Alternative to Auth0 / Firebase Auth / AWS Cognito

Open Source freemium

Authsignal is a consumer authentication and orchestration platform. Built to enable enterprise and mid-market teams to rapidly deploy omnichannel authentication and verification flows. Drop in Passkeys, Passwordless Authentication in days not weeks.

freemium $0.02 / Monthly (Monthly Active Users)

Biometric authentication at your fingertips.

Open Source

Complete user auth system installed with 8 lines of code.

Passwordless login with one-click, biometric, or QR-code

Enterprise-grade identity management for all your apps, users & devices