Terms of Use

Last updated: October 9, 2026

These terms govern your use of Derin, published by Rota Labs. By using the app you accept these terms and the Privacy Policy.

1. The service

Derin helps you put time limits on the apps and websites you choose and run focus sessions. You do not need an account to use it.

2. Subscriptions, trial and cancellation

Derin's core features are free. Derin Pro (strict mode, more active schedules, monthly insights) is paid and offered as:

• Yearly subscription: includes a 7-day free trial for new subscribers; the yearly fee is charged when the trial ends.
• Monthly subscription: no trial.
• Lifetime: a one-time payment that does not renew.

Prices are shown in the app and the store in your local currency. Payment is charged to your Apple ID or Google account when you confirm the purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. If you cancel during the free trial you are not charged. Each person can use the introductory trial only once.

Cancelling and managing a subscription is done in the store: on iOS, Settings › your Apple ID › Subscriptions; on Android, Google Play › Payments & subscriptions › Subscriptions. Deleting the app does not cancel a subscription. Refund requests are subject to Apple's or Google's refund policy, and Rota Labs cannot process them. When a subscription ends, Pro features turn off while free features and your on-device data remain.

3. Limits of the app

Derin is a helper and does not guarantee blocking.

• On iOS you can revoke the Screen Time permission at any time, in which case blocks stop working.
• On Android, manufacturer battery and background restrictions may affect blocking. You need to keep the Accessibility and usage permissions enabled.
• Operating system updates or restarting your device may cause blocks to stop working temporarily.

4. Emergencies

Phone calls and emergency calls are never blocked. Do not rely on Derin in place of any safety-critical communication tool.

5. Acceptable use

You agree not to use the app for unlawful purposes, reverse engineer it, or try to disrupt the service.

6. Limitation of liability

Derin is provided "as is". To the extent permitted by law, Rota Labs is not liable for indirect damages arising from blocking not working, interruptions or data loss. Your statutory consumer rights are not affected.

7. Changes

We may update these terms. The new version is published on this page with a new date; continuing to use the app means you accept the current terms.

8. Governing law

These terms are governed by Turkish law. Subject to mandatory consumer-protection jurisdiction rules, the courts and enforcement offices of Turkey have jurisdiction over disputes.