Is XChat End-to-End Encrypted?

Officially, yes. XChat says that all private conversations are end-to-end encrypted, and that promise is stated clearly in the App Store listing.

End-to-end encryption means the message is encrypted on your device and can be decrypted only on the recipient's device. No intermediary, including X's own servers, should have access to the plaintext. In that sense, XChat starts from a stronger privacy baseline than WeChat and sits closer to WhatsApp, though it is still less transparent than Signal.

One caveat needs to be stated plainly: XChat has not fully open-sourced its encryption code yet, and an independent cryptographic audit does not appear to be complete. Musk has described the system as using Bitcoin-style encryption, a phrase many cryptography researchers criticized as technically imprecise. That does not automatically mean the implementation is broken, but until the code is opened and independently audited, outsiders cannot really verify how strong the system is.