SimpleX Chat is an instant messenger that is decentralized and doesn’t depend on any unique identifiers such as phone numbers or usernames. Users of SimpleX Chat can scan a QR code or click an invite link to participate in group conversations.
-privacyguides.org
It’s clearly proving to be the most innovative technology when it comes to decentralized communication, in my opinion.
What does their multi-device story look like? Can I use one identity/account on multiple devices, with synced read state etc?
Edit: Looks like it’s being worked on. I don’t want to use a messenger without this feature anymore, but I’ll give SimpleX another look once it’s done.