LockSheet - Password Manager

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LockSheet is a local-first password manager that keeps your data exclusively on your device, with no account registration or server synchronization. Designed and built by a developer with 20 years of experience, it focuses on the essence of data integrity and uncompromising security.

Your site names, IDs, passwords, and notes are never transmitted to external servers. Core data is encrypted with AES-256-GCM, and master PIN protection utilizes Argon2id—a memory-hard key derivation function specifically designed to resist massive GPU parallel brute-force attacks.

■ [Standard vs. Premium]
LockSheet operates on a fair premium model to maintain sustainable service and a flawless security environment.
• Standard (Free): Store up to 50 accounts (No ads, includes all security features)
• Premium (Lifetime): Unlimited storage and permanent access to all features
✔ “Secure your digital life forever with a one-time purchase for the price of a cup of coffee. No subscriptions, ever.”

■ [Key Features]
• Comprehensive Management: Store site-specific IDs, passwords, secondary passwords, and notes.
• Smart Organization: Organize with groups and categories, supported by global search and recent visit history.
• Secure Re-authentication: Require biometric or PIN re-verification before viewing passwords.
• Safe Recovery: Reset your PIN using a secure recovery key.
• Flexible Backup: Create encrypted backup files for easy restoration or export your list as a organized PDF.

■ [Advanced Security Logic]
• AES-256-GCM Encryption: Industry-standard authenticated encryption ensuring data integrity.
• Argon2id Key Derivation: Effectively defends against hardware-accelerated (GPU) attacks.
• Android Keystore Integration: Hardware-level biometric security linking.
• Robust Defense: Failed attempt limits, auto-lock, and disabling of system-level cloud backups.

■ [Backup & Restore]
Create encrypted backup files protected by a separate backup password. Easily restore your data when switching devices or reinstalling the app. You can also generate PDF reports for offline record-keeping.

■ [Privacy & Network]
Your sensitive data never leaves your device. LockSheet only makes minimal network requests to fetch favicons when you save a website address.

■ [A Message from the Developer]
LockSheet does not profit from ads or your data. For power users managing more than 50 accounts, upgrading to Premium helps me continue developing a more secure and robust app. Thank you for supporting a developer's commitment to true security.