Privacy Policy

This Privacy Policy explains how VAST FLOW ("we", "us") handles information in connection with the website trackcaffeine.com (the "Site") and the iOS application CoffeeLog (the "App"). It applies to both. By using the Site or the App you agree to this Policy.

1. Who we are

The data controller is VAST FLOW. For any privacy question or request, contact us at [email protected].

2. Scope

This Policy covers the CoffeeLog iOS app and the TrackCaffeine website. CoffeeLog is a caffeine-tracking app: you log drinks and set a profile (such as body weight, caffeine half-life and a sleep goal). CoffeeLog does not use your camera, does not take photos, and does not send your data to any third-party AI service.

3. App data stays on your device

Your drink log and profile are stored locally on your device. There is no account and no sign-up, and this information is not transmitted to our servers. If you delete the App, this data is removed with it. You can also clear entries within the App at any time.

4. Apple Health (HealthKit)

With your explicit permission, CoffeeLog can write dietary caffeine to Apple Health and read sleep data to help you see how caffeine relates to your rest. Health data is used only to provide these in-app features. It is never sold, never used for advertising, and never shared with third parties, and it is processed on your device. You can revoke Health permissions at any time in the iOS Settings app, and we do not receive Health data on our servers.

5. Subscriptions (RevenueCat)

CoffeeLog offers a free tier and an optional paid subscription. Subscription status and an anonymous identifier are processed by RevenueCat, our subscription-management provider, and by Apple. Your actual payment details are handled solely by Apple and are never seen by us. See the RevenueCat Privacy Policy.

6. Analytics and diagnostics (Firebase)

The App uses Google Firebase for anonymized usage analytics and crash diagnostics — for example, a device/installation identifier and crash reports — to keep the App stable and improve it. This data does not identify you personally. We do not use App Tracking Transparency tracking and do not track you across other companies' apps or websites. See the Firebase Privacy and Google Privacy policies.

7. Website data

The Site uses privacy-respecting analytics (such as Google Analytics 4 and Microsoft Clarity) to understand aggregate usage — pages viewed, approximate region, device type and similar. These tools may set cookies and process truncated IP addresses. We use this only to improve the Site.

8. How we use information

We use the limited information above to operate and improve the Site and App, provide subscription features, maintain stability and security, and respond to your requests. We do not sell your personal data.

9. Third parties we rely on

• Apple — app distribution, in-app purchases, HealthKit.
• RevenueCat — subscription management.
• Google / Firebase — app analytics and crash diagnostics.
• Google Analytics — website analytics.
• Microsoft Clarity — website usage insights.
• Hetzner — website hosting and delivery.

This is the full list of categories of third parties that receive data through normal operation.

10. Cookies and consent

The Site uses cookies for analytics. Where required (for example, in the EU/UK under GDPR), we ask for your consent before setting non-essential cookies, and you can withdraw it at any time through your browser settings.

11. Data retention and deletion

App log and profile data live on your device until you delete them or remove the App. Aggregated website and app analytics are retained only as long as needed for the purposes above and then deleted or anonymized. To request deletion of any data associated with you, email [email protected].

12. Your rights

Depending on where you live, you may have rights to access, correct, delete, object to or restrict processing, and to data portability (GDPR), and rights to know, delete and opt out of the "sale" of personal information (CCPA). We do not sell personal information. To exercise any right, email [email protected] and we will respond as required by law.

13. Children

The Site and App are not directed to children under 13 (or the equivalent minimum age in your country), and we do not knowingly collect their personal data. If you believe a child has provided us data, contact us and we will delete it.

14. International transfers

Our service providers may process data in countries other than yours. Where required, such transfers are covered by appropriate safeguards (for example, Standard Contractual Clauses).

15. Health and medical disclaimer

TrackCaffeine and CoffeeLog provide general information and estimates about caffeine. They are not medical advice and are not a substitute for professional care. Caffeine values are estimates, not exact measurements.

16. Changes to this Policy

We may update this Policy from time to time. We will revise the "last updated" date above and, for material changes, provide a more prominent notice. Questions: [email protected].