When Google Began Testing Password-Free Smartphone Logins (2015)

In late December 2015, Google confirmed experimental trials of a password-free account authentication system that allowed users to log into their Google accounts on desktop browsers using their smartphones as primary authentication tokens.

How Smartphone Push Logins Worked

Rather than typing a password, a user attempting to sign in on a computer received an instant push notification on their registered smartphone asking, "Trying to sign in?" A simple tap of confirmation on the mobile device securely authenticated the desktop session. If the phone was unavailable, users could fall back to standard password entry.

Pioneering the Road to Passkeys

Traditional passwords had long proven vulnerable to phishing, brute-force attacks, and credential reuse. Google's 2015 smartphone-based approval system represented an early milestone in the broader industry movement toward passwordless authentication, which has since culminated in modern FIDO2 and biometric passkey standards across all major computing platforms.