Sub Zero Hero 
iPhone app
Keep track of what is in your freezer.
Sub Zero Hero is the iPhone app for your freezer: 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.
Free for up to 20 items in your inventory. For as many as you like, unlock the app with a one-time purchase — no subscription. One purchase covers the whole household: it applies to everyone you share your freezer with, and to your family through Family Sharing.
Requires an iPhone running iOS 18 or later. English and German.
No account. No servers of ours.
Sub Zero Hero is deliberately simple. You never sign up for anything, and your data never reaches us — nobody but you knows what is in your freezer.
No account needed
No email address, no password, no registration. Download the app and start — your Apple Account is all it needs.
Your data, your iCloud
Your inventory is stored on your iPhone and, if you use iCloud, kept in step with your other devices through your own iCloud. We cannot see it.
Works without a signal
Freezer in a cellar with no reception? Fine. The app keeps everything right on your iPhone and catches up once you are back online. It works fully without iCloud, too.
Share with your household
Invite family or flatmates with a link. Everyone sees and edits the same inventory — each person with their own Apple Account.
No ads, no tracking
No ads, no usage statistics, no other companies' code built in to watch along. The app sends us nothing — it is not built to.
Your data is yours
Export your whole inventory as a file whenever you like, for example as a backup. And “Delete all my data” removes all of it — from your iPhone and from iCloud.
What that means in detail is set out in the privacy policy.