I used SimpleX Chat (and hosted my own server) for a while last year, when it was going through some growing pains such as image transfers and group chats. Over

I used SimpleX Chat (and hosted my own server) for a while last year, when it was going through some growing pains such as image transfers and group chats. Overall, it left a good impression. I liked the concept, IMO the accountlessness makes it much easier to invite people via link and start talking immediately (compared to any other popular messenger where some sort of account is needed). The apps’ UI was clean and simple. The main issue was that one of the user’s Android app would not be able to get timely notifications no matter what we tried. My best guess is that it was an over-eager OS killing background jobs according to a whitelist (Conversations worked fine, for example). iOS app worked really well though (I know it has to use the push notification crutch). Another issue that bit me was that in order to preserve connections between users, server has to be configured to create a form of a backup, and has to be shutdown gently, not with SIGTERM. So a power outage (or carelessness) could sever existing connections.