Simple OTP Source

The world's simplest way to add passwordless authentication to your website.

✓ Source code included. Receive access via email after payment.

✓ Unlimited monthly active users (as much as your hardware can handle)

✓ Unlimited sites, use your own branding

✓ Admin dashboard to help you manage your sites

✓ Free, open-source SDKs for React, Vue, JS

✓ Send emails from a custom domain

✓ Magic sign in link OTPs

✓ "Enter a code" OTPs

✓ Passkeys / FIDO2 / WebAuthn

✓ Blacklisting and whitelisting

✓ API access

✓ Run Simple OTP on your own servers