Privacy Policy

Pentarab built the Calmnest app with a free tier, an optional auto-renewing subscription, and a non-consumable Lifetime in-app purchase that unlock premium features. This Privacy Policy explains what information the app handles and how your privacy is protected.

Calmnest keeps your personal sleep data on your device. Your sleep records, settings, and statistics are stored only on your device and are never uploaded to our servers.

We believe your sleep data is deeply personal, so we designed Calmnest to keep that content on your device. To help us improve the app, Calmnest does send pseudonymous usage analytics to Google — this never includes your sleep records. See the Analytics section below.

The app stores the following information locally on your device:

• Sleep start and end times
• Sleep induction session progress
• App settings and preferences
• Sleep statistics and insights

All this data is stored using iOS secure storage and is automatically deleted when you uninstall the app.

Premium features are unlocked through an auto-renewing subscription or a non-consumable Lifetime in-app purchase offered via the Apple App Store. All payments and billing are processed by Apple — Pentarab does not receive or store your payment card details, Apple ID, or billing address.

To validate your purchase and subscription status, the app communicates with Apple's StoreKit and may use Apple's receipt verification services. We may receive an anonymous transaction identifier from Apple solely to confirm entitlement; this identifier is not linked to your personal identity.

To understand how the app is used and to improve it, Calmnest uses Google Firebase Analytics. This collects pseudonymous usage data — such as which screens you view and which features you use — along with a device-level identifier (a Firebase app-instance ID). Your sleep records and personal content are never included.

This data is not used to track you across other companies' apps or websites, is not linked to your personal identity, and is not shared with data brokers. Calmnest does not collect the Advertising Identifier (IDFA), so no tracking prompt is shown. Analytics is processed by Google — see Google's Privacy Policy.

Other than the analytics described above, Calmnest does not integrate advertising or cross-app tracking services. Subscription processing is handled by Apple under Apple's own privacy policy.

You have complete control over your data:

• Your sleep data stays on your device
• You can delete individual sleep records in the app
• Uninstalling the app removes all on-device data permanently
• No cloud sync of your sleep data means no data recovery after deletion

Since your sleep data is stored locally on your device and is never uploaded to our servers, the security of that data depends on your device's security. We recommend:

• Keeping your device password-protected
• Using iOS security features like Face ID or Touch ID
• Keeping your iOS updated with the latest security patches

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated revision date. We encourage you to review this Privacy Policy periodically for any changes.

If you have any questions or concerns about this Privacy Policy, please contact us at: