DocVault: Personal document organizer with expiry reminders for individuals

Problem: Adults managing a growing household accumulate critical documents across passports, insurance policies, warranties, IDs, and more. These documents expire silently, and a missed expiry can mean a canceled trip, a lapsed policy, or a lost warranty claim. The HN Ask thread about managing a 'family data warehouse' captures the pain directly: people track documents for themselves, spouses, kids, and parents with no dedicated system.

Named product: DocVault is a mobile app that scans, categorizes, and reminds you about expiring personal documents.

Solution: Point your phone at any document, DocVault scans and auto-categorizes it (passport, insurance, warranty, etc.), extracts the expiry date, and sets a reminder timeline ahead of expiration. Instead of a passive folder, it becomes an active clock that nudges you before deadlines pass.

MVP: Camera scan plus OCR to detect document type and expiry date, a categorized library, and configurable expiry reminders (for example, 90, 30, and 7 days out). Local storage first to reduce privacy friction, with encrypted backup.

Revenue: Freemium with a paid tier that unlocks unlimited documents, family sharing, and cloud backup. Comparable solo apps like Rezi (~$2583/mo MRR), Kibu (~$2343/mo MRR), and Kitze (~$2233 last 30d) show that focused single-purpose tools can reach a few thousand dollars per month when built lean.

GTM: Target adults at moments of paperwork stress: renewing a passport, buying insurance, registering a warranty. Content and community answers to questions like the HN 'family data warehouse' thread can seed early users.

Growth loops: Family sharing invites spouses and relatives into the same vault, each of whom becomes a new user. Renewal reminders bring users back repeatedly, building habit and word of mouth.