The IOS and Android KAT app is free to download so you access this Help Center and learn more about KAT training.  However,  KAT training does require purchase of a KAT device. 
See also: What functions on my mobile device does the KAT app require?

The will require access to Bluetooth, Camera and Location on the mobile device. Wifi is NOT required for training after you have set up your user id, however, access  to the Help Center, and to send or retrieve data from the portal will require wifi access.
The cloud portal is expected in late 2023