Authenticating
1 Million+ Requests
Every Month
Why Passwordless?
Increase Conversion
Increase Conversion
Removing passwords can increase conversion by 54%.
Boost Online Purchases
Boost Online Purchases
1/3 online purchases are abandoned due to forgotten passwords.
Improve Security
Improve Security
Data Breach costs $240K per 1K passwords breached.
Passwordless Sign In

Passwordless Sign In

Sign in faster with one-tap login for your websites and mobile apps.

🎩
Magic Link & One Time Password

Instantly login using a magic link or a verification code sent via email, SMS, or WhatsApp.

👆
Device Based Authentication

Authenticate users based on ownership of a device. Automatically log in from a trusted device or tap a prompt sent to your mobile app.

🧬
WebAuthn (Coming Soon)

Authenticate with FaceID and Fingerprint from your websites.

Learn more about our features
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<script src="https://js.cotter.app/lib/cotter.js"></script>
<script>
  var cotter = new Cotter(API_KEY_ID);
  cotter.signInWithLink().showEmailForm();
</script>

Easy to Build, Easy to Use.

Add Passwordless Login in just a few lines of code.

Read the Documentation

Start protecting your users.

 Why Cotter?

Find out how Cotter provides a better and faster experience than passwords, OTP, magic-links, or 2FA apps.

Cotter 2.0 - A simple, lightweight, and frictionless passwordless auth | Product Hunt Embed

Ready to get started?

Create a free account and start integrating in just a few minutes.