WaterChamp Privacy Policy

Last updated: July 23, 2026

WaterChamp (“the App”, “we”, “us”) is a hydration and wellness tracking app. This policy explains what data we collect, how we use it, where it goes, and your rights. We designed WaterChamp to keep your data on your device wherever possible.

Data Controller

The data controller responsible for your personal data is Petr Peller, located in the Czech Republic. You can contact us at any time at [email protected].

Data Stored on Your Device

The following data is stored locally on your device only and is never transmitted to us or any external server:

• Hydration entries — water intake amounts, timestamps, beverage types, caffeine, alcohol, and custom notes
• Personal settings — daily goals, notification preferences, tracking limits, and display preferences
• Metabolism profile — body weight, biological sex, age, activity level, climate, and pregnancy status (used to calculate personalized hydration goals)
• Custom beverages — names, nutritional values, and favorites
• Streak and check-in data — daily usage tracking for motivation

Apple Health (HealthKit)

With your permission, the App reads and writes health data via Apple HealthKit:

Reads: Workouts, active energy, and sleep analysis — used to personalize hydration recommendations.

Writes: Dietary water, dietary caffeine, and alcoholic beverages — so your intake appears alongside other health data in Apple Health.

HealthKit data stays within Apple's Health ecosystem on your device. We do not access, store, or transmit your HealthKit data to any external server. It is never used for advertising or sold to third parties. Health data is a special category of personal data under GDPR (Article 9); we process it only on your device and only on the basis of the explicit consent you give through the iOS Health permission prompt, which you can withdraw at any time in Settings.

Data Shared with Third Parties

We use two third-party services. Both receive only limited, non-identifying technical data — never your hydration entries, health data, or on-device profile. We have no user accounts, so this data is not tied to your name or email.

Superwall (subscription analytics)

We use Superwall to manage and measure our subscription and paywall. The Superwall SDK receives:

• Purchase history — subscription status, transactions, trial starts, renewals, and cancellations
• Device identifiers — Apple vendor ID and bundle ID (not the advertising identifier / IDFA)
• Product interaction — app sessions, app installs, and paywall views
• Device information — device model, OS version, locale, timezone, and country (derived from IP address)
• A few coarse, non-identifying app attributes for audience targeting — your unit preference (ml/oz), a daily-goal band (e.g. “2000–2999 ml”, not your exact goal), whether notifications and Apple Health are enabled, and which onboarding version you saw

This data is used solely for analytics (understanding subscription metrics) and app functionality (managing subscription status). It is not used for advertising or tracking across other apps. Superwall's privacy policy: superwall.com/privacy

Sentry (crash and bug diagnostics)

We use Sentry to detect and fix crashes and bugs. The Sentry SDK receives:

• Crash and error reports — stack traces and the technical state at the time of an error
• Performance data — anonymous timing samples from a fraction of sessions
• Diagnostic logs and masked session replays — a replay reconstructs how the screen behaved during a bug, but all text and all images are masked (hidden), so it captures only anonymous layout and interaction, never your content
• Technical context — device model, OS version, and app version

We have configured Sentry not to collect your IP address or any personally identifiable information, and we do not set a user identifier, so this data is not linked to you personally. It is used solely to keep the App stable and secure. Sentry's privacy policy: sentry.io/privacy

Notifications

The App may request permission to send local notifications for hydration reminders. Notifications are scheduled entirely on your device — no data is sent to external push notification services.

The WaterChamp Website

The website at waterchamp.app (including this page) uses no cookies, analytics, or third-party trackers.

Data We Do Not Collect

• No email, name, or account information
• No location data
• No photos, camera, or contacts
• No advertising identifiers (IDFA)
• No cross-app or cross-site tracking
• No data sold to third parties

Legal Basis for Processing (GDPR)

For users in the EEA and UK, we rely on the following legal bases (GDPR Article 6, and Article 9 for health data):

• Providing the App you requested — performance of a contract, and your device permissions. Most processing happens only on your device.
• Apple Health data — your explicit consent (Article 9(2)(a)), given through the iOS Health prompt and processed only on your device.
• Subscriptions and purchases (Superwall) — performance of a contract and our legitimate interest in operating and improving the subscription.
• Crash and bug diagnostics (Sentry) — our legitimate interest in keeping the App stable and secure. You may object at any time by contacting us; note that this may reduce our ability to diagnose problems you report.

International Data Transfers

Superwall and Sentry are based in the United States, so the limited technical data described above is transferred to the US. These transfers rely on the EU–US Data Privacy Framework and/or Standard Contractual Clauses. Your hydration entries, health data, and on-device profile are never transferred — they stay on your device.

Data Retention

• On-device data — kept until you delete it in the App or uninstall the App.
• Sentry diagnostics — typically retained for about 90 days (our Sentry plan's default), after which it is deleted.
• Superwall analytics — retained in accordance with Superwall's retention policy.

Your Rights

Everyone can:

• Delete your data — deleting an entry, or uninstalling the App, removes locally stored data. HealthKit data is managed through the Apple Health app.
• Revoke HealthKit access — Settings > Health > Data Access & Devices > WaterChamp.
• Disable notifications — Settings > Notifications > WaterChamp.

If you are in the EEA or UK, you also have the right to access, rectify, erase, restrict, port, and object to the processing of your personal data, and the right to lodge a complaint with your local data protection supervisory authority. Because we hold no account and cannot identify you from the anonymous analytics, our ability to act on some requests about that specific data may be limited; the data on your device is always fully under your control in the App. To exercise a right, email [email protected].

Children's Privacy

The App is not directed to children. We do not knowingly collect data from children under 16 (or the minimum digital-consent age in your country, which may be as low as 13). If you believe a child has provided data through the App, please contact us.

Changes to This Policy

We may update this policy from time to time. Changes will be reflected in the “Last updated” date above.

Contact

If you have questions about this privacy policy or your data, contact us at [email protected].