SimpleX. Has been for 2 years now. I also use Molly, a hardened fork of Signal for first line "normie" convos.
If you haven't already, I highly recommend checking out this interview from a year ago with Evgeny and SethForPrivacy nostr:nevent1qqsrqvkmvavg0twm6vhdyym96s9w3lvdkasp0egpeh920rly9r8wgcgpr9mhxue69uhhq7tjv9kkjepwve5kzar2v9nzucm0d5pzqn4csvgddd8djhrdv63etv7nea2ehp06aj8hdyw6l4q94yhq2htdqvzqqqqqqyr56p28
I mainly use Molly right now. Thanks, I think I downloaded it but never got around to trying it out. I'll give it a go soon. SimpleX, I'll have to give it another try as well. I downloaded it a year ago, but couldn't get any of my friends in my friend group to download it. Thanks once again for the information.