Hardtack

Hardtack is an offline household inventory app for iOS and Android that tracks your reserves, warns you before every expiry date and computes your days of self-sufficiency, with no account, no cloud and no tracker, as a one-time purchase with no subscription.

It covers water, food, first-aid supplies, tools, energy and documents across the storage locations you create and name yourself. It scans UPC and EAN barcodes to fill in a product sheet, and follows several batches per item, each with its own expiry date. Local reminders go out seven days then one day before each date, grouped into a single notification per day.

The self-sufficiency engine divides your stock by your household's daily needs on three axes, water, calories and medication, and names the axis that limits the others. Three more axes, carbohydrates, fat and protein, join in once enough of the inventory carries nutritional data. A FIFO consume-first view tells you what to use next, and a restock list fills itself when an item drops below its minimum threshold.

Everything runs on the device. There is no account to create, no server and no synchronisation. The only outbound network call is an optional barcode lookup that transmits the barcode and nothing else, plus anonymous crash reports that can be switched off. Optional biometric or PIN lock, item name obfuscation and a decoy inventory protect the data if the phone itself changes hands. Sharing between your own devices goes through an encrypted QR code, generated and read locally.

The free version is capped at 10 items, 1 storage location, 1 household profile and 1 of the 8 ready-made checklists. A single purchase lifts every limit, with no subscription and nothing sold separately afterwards.