Language Coach stores your Google-verified email (your account id), your practice history and spaced-repetition progress, and short notes you ask it to remember. This data is used only to run your lessons and is kept in Google Firestore.
Practice exercises composed during sessions (example sentences and their answers — never your own messages) may be kept in a shared, anonymous exercise bank so later rounds load instantly; automated checks reject anything resembling personal information before it is stored.
Payments are handled by Paddle, the merchant of record; we never see your card details. Ask anytime to erase your memory in-conversation, or contact contact@poietic.studio to delete your account.