New in v5.4:
Link mobile and desktop apps via secure quantum-resistant protocol.
Better groups:
Faster to join and more reliable.
Create groups with incognito profile.
Block group members to hide...
simplex seems to check all boxes for respecting privacy. it doesnt rely on using any identity (no strong selectors like email addresses or phone number). seems very forward-thinking in its concepts.
there is now a discovery mechanism of some sort... but otherwise it's a feature and not a bug that you can only identify people whom you had an initial exchange with. much preferable than something that Signal that without asking (and without opting out?) will by default access all your contacts and match them through the use of a strong selector (phone number)
also:
i think with the minimal knowledge the server has of its users (and the no-identity concept) this really limits risk. Also it means that for the most tight of security models, one can use their own server (which is not feasible with most other chat protocols)
been selfhosting the smtp relay and using the app for quite a while. If you use it as a private chat for sensitive content, it is PERFECT. Really looking forward to its future development in group chats.