Cotter
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HTML – Sign in with Email/Phone
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iOS – Sign in with Device
Flutter – Sign in with Device
📘 SDK Reference
Web
React Native
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Android
Sign In with Device
Sign In with Email/Phone Number
Biometric/Pin
Older SDK Version
Python (for CLI)
API for Other Mobile Apps or CLI
Backend: Handling Response
🛡️ Protecting Your Account
Only Allow Your Website/App to Use Your API Key
Rate Limit
Enable reCAPTCHA to Protect Against Automated Abuse
🗝️ Getting Access Token
Cotter's OAuth 2.0 Tokens Specification
Storing and Removing Tokens
Renewing Expired Tokens
Verifying JWT Tokens
Older API
🔌 API Reference
User API
OAuth Tokens API
Event Object
Older API
Validating Cotter's Identity Token
Validating Cotter's Event Response
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Android

The easiest way to add Passwordless Login and Email/Phone Number Verification to your Android app.

Complete Guides

Sign in with Device

Allow users to login automatically from a device that they trust.

Sign in with Email/Phone Number

Authenticate users by sending a Magic Link or OTP via email, SMS, or WhatsApp.

Add Biometric/Pin

Add a second layer to protect your mobile app using Biometric or Pin.

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Last updated 2 months ago