Support
Deftest is independently built and supported. Emails are read by the developer, not a ticket system.
support@deftest.appWhen writing about a problem
Two details shorten every conversation: whether you're on Mac or iPhone, and what you expected to happen versus what happened. If the issue involves an import, the first few lines of the CSV (with any private details removed) usually reveal everything.
Your data is safe either way
Whatever the problem, your records are on your device and in your own iCloud — support never requires access to them, and no one but you has any. If you ever want your data out of Deftest, Settings → Import & Export → Back Up Everything saves a folder of plain CSV files that open in any spreadsheet.
Subscriptions and purchases
Purchases are handled by Apple. To manage or cancel a subscription, use your App Store account settings; for refunds, Apple's Report a Problem page is the official route. If a purchase isn't recognized in the app, tap Restore Purchases in Settings → Subscription first — it resolves nearly every case.