I tried SimpleX but the VPN kill switch on my phone prevents syncing with my computer.
I use telegram primarily as a note taking app with sync features.
Occasionally I send files to friends, so having easy set up for tech illiterate would be great.
It works on up to 5 devices at the same time. I’ve used signal on my phone, with it also open on my computer with zero problems. Syncing is instantaneous.
Open Signal rewiews on GooglePlay, there’s every third review about this situation. I forgot to mention, i’m talking about the Android version. The ios version works on ipad at the same time