Effective Date: 2026.05.24

"Miridum" (the "App") is committed to protecting your privacy. This Privacy Policy explains what information the App processes, how it is used, and your rights as a user.

Please read this policy carefully before using the App.

1. Who We Are

This App is operated by an independent developer.

2. The App Processes No Data on Our Servers

All data you enter or that is read from Apple Health remains on your device at all times.

We do not operate any servers. We do not collect, transmit, store, or have access to your personal data. Even as developers, we have no technical ability to access the information you input into the App. No data leaves your device except as you explicitly choose to export it (e.g., to Apple Calendar or Apple Health).

This is a foundational design principle of Miridum, not a policy that may change — it is a technical limitation built into how the App works.

3. What the App Reads and Writes

With your explicit permission, the App interacts with Apple HealthKit and Apple Calendar solely to provide its core features.

Data Type Read Write Purpose
Menstrual cycle records (HealthKit) ✓ ✓ Cycle prediction; writing predicted cycle data back to Health
Wrist skin temperature (HealthKit) ✓ — Ovulation estimation
Calendar events (Apple Calendar) — ✓ Exporting menstrual and ovulation cycle events

You can revoke any of these permissions at any time via Settings → Privacy & Security → Health or Settings → Privacy & Security → Calendars on your device.