Health data is arguably the most sensitive information a person possesses. In an era where data breaches are daily news, asking users to trust a cloud server with their medical history is a tall order. When we built Calon, we decided to take a fundamentally different approach: Zero-Knowledge Architecture.

The Problem with Cloud Health Tracking

Most popular health and fitness apps function as data vacuums. They harvest your daily steps, menstrual cycles, and symptoms, transmitting them to central servers where they are often anonymized and sold to advertisers. Not only is this a privacy nightmare, but it also creates a massive central target for hackers.

Calon's Encryption Standards

With Calon, your device is your vault. We utilize AES-256 encryption - the same standard used by governments and financial institutions - to secure your local SQLite database.

• At Rest: When your phone is locked, your health data is mathematically unreadable without your local decryption key.
• In Transit: Because Calon is an offline-first app, your core health data never actually goes "in transit." It stays on the phone.
• Biometric Guard: The app requires your fingerprint or face scan to decrypt the local database upon opening.

Empowering the User

By enforcing local-only storage, Calon gives you ultimate control. If you delete the app, your data is gone forever. No lingering cloud backups. No corporate surveillance. Just you and your health, completely private.