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100% offline, zero-knowledge vault to securely scan & store your payment cards.
**Card Saver** is the ultimate privacy-first, zero-knowledge digital vault for your physical payment cards. Built for users who demand absolute security, Card Saver operates **100% offline**—your data never leaves your device. Say goodbye to manually typing long card numbers. Using on-device AI, Card Saver lets you instantly scan your physical cards using your camera. Because the intelligence runs directly on your phone's hardware, no images or text are ever transmitted to the cloud. **Key Features:** 🔒 **Military-Grade Security:** Your vault is secured by industry-standard AES-256-GCM encryption, locked directly to your device's hardware Keystore. 📱 **100% Offline Architecture:** Card Saver requests zero internet permissions. Your data physically cannot be transmitted or uploaded. 📸 **On-Device AI Scanner:** Instantly scan your card numbers using Google ML Kit’s offline optical character recognition. 👆 **Biometric Lock:** Secure your cards behind your fingerprint, face scan, or device PIN. 🛡️ **Privacy Hardened:** App screenshots are blocked at the OS level (`FLAG_SECURE`), and sensitive copy/paste functions are strictly regulated. 💾 **Encrypted Backups:** Create highly secure, password-protected `.csbackup` files (Argon2id derivation) to safely transfer your vault to a new device. **Why Card Saver?** Unlike traditional cloud wallets, Card Saver is a true "zero-knowledge" application. We do not have servers, we do not require an account, and we have absolutely no way to access your data. You are in complete control. *Note: Because Card Saver uses hardware-backed encryption, if you lose your device PIN or biometric access, your vault cannot be recovered by the developer.*