Privacy Policy

Last updated: June 21, 2026

Cadence helps one person track and interpret a partner's menstrual cycle. It stores intimate, sensitive information — cycle dates, moods, and free-text notes. This policy explains what is stored, where it lives, and where, if anywhere, it goes.

What we store

• Period start/end dates and derived cycle and phase data.
• Mood check-ins and free-text notes you enter.
• App settings (notification preferences).

Where it lives

All of your data is stored on your device. Cadence has no account system, no backend database, and no server-side copy of your data. We do not sell, share, or transmit your stored data to us or to any third party for advertising or analytics. There are no analytics or ad SDKs in the app.

On Android the data is encrypted at rest — stored with a key held in the device keystore.

The one network call: AI guidance

To generate the daily AI insight and personalized do/avoid guidance, the app sends the relevant cycle data, moods, and notes to Anthropic's Claude API. To keep our API key off your device, this call goes through a small proxy server we run, which forwards it to Anthropic.

• This is the only outbound transmission of your data.
• Anthropic processes API inputs to generate the response and, per its API terms, does not use API inputs to train its models. Review Anthropic's privacy policy for current details.
• If AI guidance is turned off, the app works with built-in static guidance and no data leaves the device.

Your controls

• Delete a note: remove individual notes from Settings → Notes.
• Delete everything: Settings → Reset All Data wipes all on-device data. This cannot be undone.

Consent note

Cadence stores intimate health information about another person. Only use it with that person's knowledge and consent.