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The X iPhone app added passwordless logins with passkeys
You can skip the password on X.
X is now supporting passkey log-ins on iPhones and iPads, granting members access to the security feature regardless of their “Premium” status. Also, X’s rollout of passkeys doesn’t seem to be complete yet (some users reported still not having access as of Tuesday night on the East Coast), so don’t fret if the feature hasn’t popped up yet. That way, you can sign in to Gmail, PayPal, or iCloud just by activating Face ID on your iPhone, your Android phone’s fingerprint sensor, or with Windows Hello on a PC.
Or read this on The Verge