Tried it a year ago it's super alpha & pretty broken. Looked at it again a few days ago still pretty much in the same state it was last year not a single new feature has been added. This however is productive & rolling out updates constantly improving & listening to the people.

SimpleX Chat: private and secure messenger without any user IDs (not even random)

SimpleX Chat - a private and encrypted messenger without any user IDs (not even random ones)! Make a private connection via link / QR code to send ...

read the protocol in the docs.

Try keet.io