Sub Zero Hero 
iPhone app
Keep track of what is in your freezer.
Sub Zero Hero is a native iPhone app for your household: put food away, see at a glance what you have, and never forget what is hiding at the back of the freezer again. No account, no sign-up — your inventory lives on your iPhone and in your own iCloud.
Requires an iPhone running iOS 18 or later. English and German.
No account. No servers of ours.
Sub Zero Hero is deliberately small. There is no sign-up, no database on our side, and no service of ours that knows what is in your freezer.
No account needed
No email address, no password, no registration. Install the app and start — your identity is your Apple Account.
Your data, your iCloud
Your inventory is stored on your iPhone and, when you are signed in to iCloud, synced across your devices through your own private iCloud database. We have no access to it.
Works without a signal
Freezer in a cellar with no reception? Fine. The app works locally and syncs later. Signed out of iCloud it keeps working completely.
Share with your household
Share your household with your family by link. Everyone sees and edits the same inventory — each person with their own Apple Account.
No ads, no tracking
No analytics tools, no third-party SDKs, no advertising identifiers. The app sends us no data — it has no interface for doing so.
Your data is yours
Export your whole inventory as a JSON file whenever you like. And get rid of all of it by deleting the app.
What that means in detail is set out in the privacy policy.