Fast

In plain words

Fast is a login and checkout solution that enables one-click authentication on any website using email verification. The service works for all users without requiring a Fast account, and developers can integrate it via an easy-to-add button. It targets commerce platforms and other websites seeking to streamline user authentication and reduce friction in the login process.

written from the facts on this page · September 2026

From the sources

Fast is the easiest way to securely login. The Fast button can be easily added to any website for secure one-click login for all users. Fast supports 100% of users, authenticating through email, and doesn’t require users to have a Fast account. Login, Fast!

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