Support
Email support@box1.app. Tell us your device, your iOS version, and what you expected to happen.
Is my collection backed up?
Yes, if your device is signed into iCloud. box1 backs your collection up to your own iCloud account and restores it on a new phone signed into the same account. Settings → Collection says whether the backup is running. Without iCloud, your collection lives only on the device, so deleting the app deletes it. Use Settings → Collection → Export to save a file somewhere you keep things.
My catches are not showing on my other device
Both devices need to be signed into the same iCloud account, with iCloud on for box1. Open box1 on both, give it a minute, and the catches will appear. From then on, a change on either device reaches the other.
I switched iCloud accounts
Your collection stays on the device, and box1 backs it up to the new account. The privacy policy's iCloud backup section says exactly what happens to each account.
Can I move my collection without iCloud?
Yes. Export it from Settings → Collection → Export, then use Import on the other device. An import only ever adds catches, so importing a file over an existing collection is always safe.
Start over, or remove my data
Settings → Reset Pokedex clears every catch, nickname and note, and syncs the reset to your other devices. box1 has no accounts and we hold no copy of your data, so there is nothing for us to delete. The privacy policy's Removing your data lists every copy and how to remove each one.
I would rather not see the official artwork
Settings → Original Artwork turns it off. Sprites then draw as silhouettes and every other feature keeps working.