You don't need an alternative. Signal is the best private messenger in terms of privacy and usability.

SimpleX has more privacy and anonymity but has worse usability.

Matrix has terrible metadata privacy and terrible usability.

> Matrix has terrible metadata privacy

Federated, can run server and have strong metadata privacy talking to your family but still talk to people on other servers publicly when you wish so you have choices to control your privacy as much as you wish.

> Signal is the best private messenger in terms of privacy and usability.

Requires proprietary operating systems, a phone number, and centralized US infrastructure where all network metadata lands in one place for much easier timing analysis. With MobileCoin, which was definitely something all users wanted and great messenger UX.

Right.

My daily driver for family, friends, and coworkers is Element/Matrix.