VaultExpense: Offline Tracker

Take complete control of your financial privacy with BlockExpense — the world’s first 100% offline, on-device blockchain expense manager. Unlike traditional financial apps that upload your bank balances and personal bills to third-party cloud servers, BlockExpense secures every single expense, salary, and medical bill inside a cryptographic on-device blockchain ledger. 🛡️ ZERO-KNOWLEDGE & 100% OFFLINE PRIVACY • No cloud storage, no data tracking, and zero bank logins required. • Every transaction is digitally signed with an asymmetric on-device secp256k1 cryptographic key. • SHA-256 Merkle Tree block verification makes your financial records 100% tamper-proof and immutable. 🏥 SPECIALIZED MEDICAL & MATERNITY EXPENSE TRACKER • Track hospital bills, doctor consultations, lab tests, and ultrasound scans. • Dedicated maternity stage tracking (Prenatal, Delivery, Postnatal). • Attach bill receipts with cryptographic offline hash verification. 🔐 BIOMETRIC SECURITY & 4-DIGIT PIN LOCK • Fast Face ID / Touch ID / Fingerprint unlock. • 4-Digit Security PIN with salted SHA-256 on-device hashing. • Automatic background App-Lock: Secures your ledger the moment your phone screen turns off. • PIN-authorized destructive reset: No data can be erased without your 4-digit master PIN. 💳 PCI-DSS COMPLIANT BANK & CARD MASKING • Link accounts and credit/debit cards using ONLY the last 4 digits (e.g., •••• 4892). • Zero full card numbers or CVVs stored — ensuring 100% compliance and safety. • Track spending by payment mode: UPI (GPay, PhonePe, Paytm), Net Banking, Credit Card, or Cash. 📊 VISUAL ANALYTICS & SMART BUDGETS • Interactive category breakdown and spending trend charts. • Monthly category budgets with color-coded warning indicators. • Recurring payments & EMI auto-tracker for loans, SIPs, and insurance bills. 📦 AES-256 ENCRYPTED BACKUP & EXPORTS • Export encrypted backup files using military-grade AES-256-CBC with PBKDF2 (5,000 rounds). • Generate official, stamp-ready PDF and CSV financial statements directly from your device. 🌐 MULTI-LANGUAGE & THEMES • Full bilingual support in English and Hindi (हिन्दी). • Elegant Dark Navy (#0B0F19), System Auto, and Light themes. No Internet Needed • No Bank Account Scraping • 100% Owned by You.