I don't think you can even use the same Signal account on two different iOS devices, much less desktop. Their desktop apps just link to the phone's app. WhatsA

I don't think you can even use the same Signal account on two different iOS devices, much less desktop. Their desktop apps just link to the phone's app. WhatsApp is a total joke, it loses media (IIRC this includes audio messages as well) people send you after a very short time even when you use it on a single device, so talking about multi-device usage is completely out of the overton window.