Yes. Everything you study is inside the app. You need a connection only to subscribe or restore a purchase.

No. There is no account and no sign-in. Your answers, notes and progress stay on your device.

Everything is open for 7 days from the first time you open Panel, with no purchase or card, and it does not turn into a subscription. It is counted once; reinstalling does not restart it.

In your Apple Account: Settings → your name → Subscriptions, or from Manage subscription in Panel. Cancel at least 24 hours before the month ends to avoid the next charge. Refunds are Apple's, under Apple's policies.

Yes. Pro to Plus starts at once; Plus to Pro starts when the Plus month ends.

iPhone and iPad on iOS 17 or later. To move to a new device, restore from a backup and your progress comes with it.

Send it through the form below as "Question review" with the specialty and the first words of the question, plus a screenshot if you can. It is reviewed and fixed in the next update.