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Open the app, go to the enroll screen or Settings, and tap Restore purchase. As long as you're signed in with the same Apple ID, it restores free.
No. VocabGap is a one-time purchase. Pay once, own it forever.
Your first 3 days include 50 preview words spanning everyday to GRE level, with every feature enabled. After that, a one-time purchase unlocks the full 4,000+ word program.
Change it anytime in Settings under Daily pace. If you've set a GRE exam date, the app may raise your pace to keep you on schedule; moving the exam date lowers it.
Go to iOS Settings, then Accessibility, Spoken Content, Voices. Download any voice marked Enhanced or Premium, then pick it in VocabGap's Settings.
No. All data is stored on your device only, so deleting the app deletes your progress. Your purchase itself always restores through your Apple ID.