Cotter is the easiest way to add passwordless login to websites built on No-Code website builders like Webflow, Wix, Wordpress, etc. Simply copy and paste a URL and you will instantly be able to authenticate your users!

Cotter is the fastest way to convert users -- we let you build apps and websites with instant, passwordless login. We save engineering time by creating an SDK that developers can copy and paste in minutes!

An authentication SDK that lets users log in using only their Phone Numbers without a password.

Integrate secure phone number login to your web/apps. It’s universal, works across apps, and doesn't require users to have a Cotter account.

*Free for email logins*