Terms of Service

Last updated: April 2, 2026

These Terms of Service ("Terms") govern your use of the HALFLIFE iOS application ("the app", "we", "us", "our"). By downloading or using HALFLIFE, you agree to these Terms.

1. Description of Service

HALFLIFE is a caffeine tapering application that provides personalized taper schedules, caffeine tracking, withdrawal prediction, and related wellness features. The app is available on iOS devices through the Apple App Store.

2. Medical Disclaimer

HALFLIFE provides general wellness information based on published medical literature about caffeine pharmacology and withdrawal. It is not a substitute for professional medical advice, diagnosis, or treatment.

The taper schedules are based on guidelines from the Cleveland Clinic, Mayo Clinic, and American Academy of Sleep Medicine recommending gradual caffeine reduction of 10-25% per week. Consult a healthcare provider before making significant changes to caffeine consumption, especially if you are pregnant, nursing, taking medications, or have a medical condition.

3. Account

You may use HALFLIFE with an anonymous account or by signing in with Apple. You are responsible for maintaining the security of your account. If you use anonymous authentication, your data cannot be recovered if you lose access to your device.

4. Subscriptions & Payments

HALFLIFE offers a free tier with limited features and a premium subscription with full access. Subscriptions are billed through Apple's App Store and are subject to Apple's terms and conditions.

• Payment is charged to your Apple ID account at confirmation of purchase
• Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period
• You can manage and cancel subscriptions in your Apple ID account settings
• Free trial periods, if offered, automatically convert to paid subscriptions unless cancelled before the trial ends
• Refunds are handled by Apple in accordance with their refund policy

5. Acceptable Use

You agree not to:

• Use the app for any unlawful purpose
• Attempt to reverse engineer, decompile, or disassemble the app
• Interfere with or disrupt the app's infrastructure
• Share your account credentials with others
• Use the app to provide medical advice to others

6. Intellectual Property

HALFLIFE and its contents, features, and functionality are protected by copyright, trademark, and other intellectual property laws. The caffeine database is compiled from publicly available USDA and manufacturer data.

7. Limitation of Liability

To the fullest extent permitted by law, HALFLIFE and its operator shall not be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of the app. Our total liability shall not exceed the amount you paid for the app in the 12 months preceding the claim.

We do not guarantee specific health outcomes from using the app. Individual results vary based on caffeine intake levels, metabolism, adherence to the taper plan, and other factors.

8. Termination

We may terminate or suspend your access to the app at any time, without prior notice, for conduct that we believe violates these Terms or is harmful to other users, us, or third parties. You may delete your account at any time through the app.

9. Changes to Terms

We may update these Terms from time to time. Material changes will be communicated through the app. Continued use after changes constitutes acceptance.

10. Governing Law

These Terms are governed by the laws of the Federal Republic of Germany. Any disputes shall be resolved in the courts of Germany, without regard to conflict of law provisions.

11. Contact

For questions about these Terms, contact us at support@gethalflife.app.