Hey fellow Thunkers 
Today I present to you my newest development in encrypted chat applications. GroupChat is an end-to-end encrypted messenger built entirely in AppInventor (for compatibility reasons). In theory, endless people can join a chatroom. The app uses Firebase as a backend database. This project is more reliable and secure than any of my previous projects!
Instructions
- To join a chat, open the settings screen
and click “Scan someones QR code” - You can change your name on the settings screen
- To leave a chat, click the red button which says “Leave this chat”. A new chat with only you in it will be automatically created
- Write your message in the
textbox and click 
to send it
Please test the apk groupchat.apk (3.9 MB) to ensure everything is working correctly. Once I get feedback that everything works, I will release the source files
Extensions used
- FileAlt extension by me
- QRCodeCreater extension by @Zhangzqs
- cryptoextension by @Tiziano1960