I think at this point it would be funnier to just use something obviously unsecure like discord but share your public key with the other user and then send encrypted text.
this post was submitted on 07 Feb 2025
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You may want SimpleX. You can still self-host your own server if you wish, but it doesn't have nearly the metadata issues of matrix and encryption keys are stored in a database that you back up instead of constantly breaking
Last time I tried Simplex, the desktop app was incompatible with the mobile app. Do you know whether this has been fixed?
I haven't personally tried it, but I think there's a setting in the mobile app for using it with a desktop. So I assume it is fixed, but I won't swear to it.
It works. You either have to link it with your mobile app or you use it standalone with a different user/id
The two encrypted messaging platforms I currently suggest are XMPP or Matrix. Both are usually fine and are decentralized. The main thing with them is to either self-host or choose a server you trust to set up an account — which applies to the Fediverse in general.
Out of curiosity, is there anything stopping you from suggesting SimpleX? How does SimpleX compare to XMPP or Matrix?
Mostly just that it's still pretty new and thus hasn't been as polished or scrutinized yet. Haven't tried it myself. For the sake of the OP's question, it may also be notable that it's a UK company.
There’s also Wire
E2EE and can be used as desktop or phone app interchangeably. No phone number required for signup.
Family has been using this for years now
I've heard good things about simplex give it a look