Open the site in Safari (not the Instagram browser: tap the three dots, then "Open in browser"), then tap the Share button and choose Add to Home Screen. It works fully offline after the first load.
Pro is linked to the email you paid with. On a new device, create an account with that email (Settings, then sign in) and Pro unlocks automatically. If you have a restore code from your receipt instead, use Settings, then Restore purchase. Stuck? Email us and we'll sort it.
Make sure you're signed into the same Apple ID you bought with, then tap Settings, then Restore purchase to restore your In-App Purchase. Purchases are tied to your Apple ID and can always be restored on any device signed into it.
If you're signed into an account, your progress is backed up and will sync back. If you use the app without an account, progress lives only on your device, so use Settings, then Export progress now and then to save a backup file, and Import progress to restore it.
Every question shows its ID (like QR-0123) at the bottom of the explanation after you answer. Email us the ID and what you think is wrong. Every report is reviewed.
If something is genuinely broken and we can't fix it for you, we'll refund you. Email us and we'll help.
Refunds for App Store purchases are handled by Apple. Visit reportaproblem.apple.com, or in Settings on your device tap your name, then Media & Purchases, to request a refund. If something is genuinely broken, email us too and we'll help however we can.