You can use signal on a desktop but you still need to tie your account to a phone number. It has a mechanism to share your history and all that to a desktop app

You can use signal on a desktop but you still need to tie your account to a phone number. It has a mechanism to share your history and all that to a desktop app, with key certification managed (afaik) from your phone app (and it requires periodic re-pairing of it if you're not using it regularly). It's not really a great experience imo.