XChat, currently in beta mode, is Elon Musk's newly announced encrypted messaging and calling feature built into X (formerly Twitter).
According to Musk, XChat is
built on "a whole new architecture" with "Bitcoin-style encryption", supporting features like vanishing messages, file sharing, and cross-platform audio and video calls without requiring a phone number.
XChat is being rolled out to selected users, particularly those with paid subscriptions, with plans to expand access once stability and scaling concerns are addressed.
Author's summary: Elon Musk introduces XChat, a private messaging app with advanced encryption.