This chat app itself is useless without a working instance of BlaB! AX, BlaB! AX Pro, BlaB! WS or BlaB! WS Pro. Enter the code provided by the owner of the site and join the chat.
The app lists phone, microphone and storage. The app will function properly without granting any permissions.
The source code is on GitHub: https://github.com/uuencode/BlaB-G