A tips i can give delta chat (depending on what you want)

If you like how you do it you can copy the signal/what's app way, and add your, and let in the first launch choose.

So for grandma we can set (what's app mode) so she's not lost.

And maintain your for our.

DC is easily my favorite UX of these 3 because any device can be the primary - needing to create accounts on Whatsapp and Signal with a phone and tie a phone number to the account before creating a quite awkward secondary on a computer is, especially after that WA data leak, pretty unfortunate.

other folks have mentioned some Matrix and XMPP clients, and while I understand why DC does everything with QR codes to mitigate MITM attacks, it does make that standard workflow of scanning a QR code off a phone into the computer a pain in the neck. Matrix's approach to a username/password and then key syncing via emoji checking is really universal and slick.

@Delta Chat it used to be signal of the three but they've made that more difficult particularly when using with two different phones with their own phone number. For most this probably isn't a normal use case but those off is with separate work and personal devices who prefer to have the same conversations available on both phones that sucks.

Of the OTHER options I have had best experience with XMPP based apps like CONVERSATIONS.

I more-or-less gave up on Delta chat because I couldn't get multiple devices working right between my personal Android phone and work Windows laptop.