Morning
Iām not an expert on SimpleX, but if I understand correctly, SimpleX is anonymous and uses randomly generated keys to secure messages. I presume the messages are as secure as any other platform. It was backed by Jack Dorsey, so I'm sure it is excellent.
0xChat uses your NOSTR keys, which you own and control. The software is FOSS and you can see it on Github here:
0xChat uses 3 layers of encryption which was the discussion of the quoted thread above.
For me, being in control of my own encryption keys is a big deal. The negative right now is the need to copy and paste you nsec into the app, which is a security issue as you are potentially exposing your private key.
In time, NOSTR should have private key management the same as Bitcoin.
I guess what I'm trying to voice is:
"Not your keys, not your messages"