Email support@xscace.com and a human will reply. Please say which device and iOS version you're on.
On your device. If you turn on sync, they are mirrored to your own private iCloud database — your Apple Account, not a server of ours. We cannot see them.
The very first sync needs Wi-Fi. iCloud will not run that initial setup over a cellular connection. Once it has run once, cellular works normally. Sync also needs to be switched on in Settings, and requires Pro.
The rewriting uses Apple Intelligence, which needs a supported device with it switched on in iOS Settings. Without it, notes are still saved and searchable — they are tagged by keyword instead. Capture never depends on it.
Long-press the Home Screen, tap Edit, then Add Widget, and search for Unfog. For Siri, say “Add a note to Unfog”. You can also map the Action Button to it.
Settings ▸ Backup ▸ Export. You get a plain JSON file or readable Markdown. Unfog also keeps rolling automatic backups you can restore from the same screen.
Subscriptions are handled by Apple. Open the Settings app, tap your name, then Subscriptions. Refund requests go through Apple at reportaproblem.apple.com.
Settings ▸ Delete all thoughts removes everything from the device. If sync was on, deleting also removes the copies from your iCloud database.