If you already have a matrix account you con join directly using this address within the app: #zooeydotpub:zoospace.org
Fluffychat
FluffyChat is an open source, nonprofit and cute matrix messenger app.
This app can look very similar to discord if you enable the bottom two settings in the "style" menu.
Note: when uploading images please keep the default option "Compress" checked to avoid sending images with sensitive metadata.
The following web apps also work on mobile although without notifications.
Zinny
A zooey matrix client where you can enjoy the conversation using simple, elegant and secure interface protected by e2ee with the power of open source.