Being testing SimpkeX chat and, IMO is not ready for prime time, needs work to compete with the best out there in privacy, like Session app, Threema and Briar... Signal is better than WhatsApp but requires your phone number so most tech savvy people will pass:

Reasons why, IMO, SimoleX Chat is not ready:

1. Not native TOR built in, you need to configure it and keep TOR proxy open in the background...

2. Battery consumption is too high,its a battery killer

3. The UI needs work to be simple and easy to use and understand for not tech savvy users, currently is too complex for non geeks

Tested the app extensively, good sound quality and reliable, but the cons are a wall for adoption

Tested on non savvy friends for installation and performing a chat and a call. It didnt pass, all of them required assistance to configure and send a link for connection

For unparalleled privacy at the moment, Session App, followed by Threema (just don't add your phone number, is optional...)

Hope this helps