This is a desktop client for private messages, works fluently, and surprisingly, it has support for group chat! It leaves Whitenoise behind on this. Tested on macos:
For what I know, flotilla use different solution to enable group messages. Apparently, it force the "admin" to run a relay to keep messages in spaces private.
Coop is available for desktop only and Flotilla instead is currently is available from web as PWA, and for both mobile iOS and droid. APK v1.3 file available for download https://github.com/coracle-social/flotilla/releases it should probably be in the zap.store too
cc:
@AG