I'd just like to mention that Matrix (and its most prominent client "Element") sounds similar: > Even better is Wire: no phone number required, doesn't access

I'd just like to mention that Matrix (and its most prominent client "Element") sounds similar: > Even better is Wire: no phone number required, doesn't access your contacts, free personal accounts available, you can use it on a desktop machine with nothing more than a web browser Same > when using an installed app you can be logged into three Wire accounts at the same time Don't know if that's possible with one of the currently existing Matrix-clients. I guess that maybe in the future that would be possible, respectively, doesn't sound too difficult to implement. > is open source and has been audited for security, you can set up your own locally hosted (or in your own cloud) Same for Matrix. Not sure about the official audit, but at least France decided to use it as a base for its own governmental chat ( https://matrix.org/blog/2018/04/26/matrix-and-riot-confirmed-as-the-basis-for-frances-secure-instant-messenger-app https://matrix.org/blog/2018/04/26/matrix-and-riot-confirmed... ) so I guess/hope that they audited the original software.