Dead Drop: Geo Encrypted

Dead Drop lets you leave encrypted messages at real-world GPS locations for others to find. Think of it as a digital geocache with military-grade encryption.

Create encrypted drops locked by time, location, and password. Only someone with the right password, at the right place, at the right time can read your message.

Features:
- AES-256-GCM encryption with PBKDF2 key derivation
- GPS geo-locking — messages can only be opened at specific locations
- Time locks — set a delay before messages can be decrypted
- Self-destructing messages with automatic expiry
- File attachments with full encryption
- Anonymous or named posting
- Nearby message discovery within GPS range
- Proximity notifications — get alerted when you walk near a hidden message
- Brute-force protection — 6 wrong passwords destroys the message

Dead Drop collects location data to enable proximity notifications even when the app is closed or not in use.

Free tier includes 20 messages per month. Pro and Business tiers available for power users.