Support
There is no account to reset and no password.
Your deck, reviews, and settings are stored on the phone. Deleting the app deletes them.
On the same Wi-Fi
A deck can move to another phone by a QR code. The camera is only used to scan that code. Both phones have to be on the same network, and nothing from that sync is sent to a server.
Hearing a card
Each starter card has a recording in the app. If a recording is missing, the phone speaks the word itself.