App Support & Help Center

Frequently Asked Questions

1. How do I restore my Lifetime Purchase on a new device?

CycleCipher uses Apple's native StoreKit 2. To restore an existing purchase:

1. Open CycleCipher and navigate to the Instellingen (Settings) tab.
2. Tap on Ontgrendel (€9,99) to open the purchase sheet.
3. Scroll down and tap Herstel Eerdere Aankopen (Restore Previous Purchases).
4. Your purchase will immediately be validated via your Apple ID and full access restored with no additional charge.

2. How does Zero-Knowledge Encryption protect my privacy?

All sensitive logs—including menstrual cycle dates, flow heaviness, symptoms, mood, and intimacy notes—are encrypted directly on your iPhone using AES-256-GCM authenticated encryption before storage. Decryption keys are managed strictly by your device's hardware Secure Enclave. We, the developers, have zero access to your health data.

3. How do I activate Discreet Mode and Biometrics?

In the Settings tab, you can toggle Discreet Uiterlijk (Discreet Appearance). When enabled, push notifications and lock screen widgets will use neutral, non-medical wording to prevent onlookers from seeing sensitive period information.

4. How do I delete my data or account?

Under Settings > Accountbeheer (Account Management), you can tap Verwijder Account en Alle Gegevens (Delete Account and All Data). This triggers an immediate, irreversible wipe of the local encrypted SQLite vault, the Secure Enclave keys, and any associated encrypted cloud backup blobs.

5. How are my cycle and ovulation predictions calculated?

Predictions are generated entirely on your device using deterministic statistical cycle modeling based on your historical cycle lengths (median duration and variation). Our algorithms are referenced against clinical guidelines from the American College of Obstetricians and Gynecologists (ACOG) and the NHS. You can view our full clinical references on our Medical Sources page.