GrowMax Privacy Policy
Effective date: October 26, 2026
GrowMax ("we", "the app") predicts adult height and helps users build healthy growth habits. This policy explains what data the app uses, why, and your choices. An account is optional. You can use GrowMax as a guest, or create an account with your email address to back up your progress.
Account and cloud backup
If you create an account, we store your email address (via Google Firebase Authentication) and a backup of your in-app progress (quiz answers, height check-ins, exercise, meal and sleep logs) in Google Cloud Firestore, linked to your account and readable only by you. Health Connect data is never included in the backup. You can delete your account and its backup at any time in the app (Settings → Account → Delete account) or by following the steps at growmax-height-app.web.app/delete-account.
1. Information you enter
Your answers (sex, age, height, weight, parents' and relatives' heights, puberty and lifestyle questions), height check-ins, exercise, meal and sleep logs are stored on your device. If you sign in, a copy is backed up to your private cloud account (see below). We never sell this data.
2. Health Connect data
If you choose to connect a health device, GrowMax uses Android Health Connect to:
| Data | Access | Purpose |
|---|---|---|
| Sleep sessions | Read | Count nights of 7+ hours toward your sleep streak and habit score |
| Steps | Read | Show today's steps and power step challenges |
| Height | Read & write | Import measured heights as growth check-ins, and save your manual check-ins back to Health Connect |
| Weight | Read | Keep your profile weight up to date for the prediction |
Health Connect data is processed on your device only. It is never sent to our servers, never shared with third parties, and never used for advertising. You can revoke access at any time in Android Settings → Health Connect → App permissions. GrowMax's use of information received from Health Connect adheres to the Health Connect Permissions policy, including the Limited Use requirements.
3. Advertising (free version)
The free version shows ads from Google AdMob. AdMob may collect your device's advertising ID, IP address and app-usage information to show and measure ads, and may show personalized ads where permitted. In regions where consent is required (such as the EU and UK) you will be asked for consent first and can change it later. You can reset or delete your advertising ID in Android Settings → Privacy → Ads. Premium subscribers see no ads. Learn more: How Google uses information from apps that use its services.
4. Analytics and crash reports
We use Google Firebase Analytics and Firebase Crashlytics to understand how the app is used (for example, whether onboarding was completed or the paywall was viewed) and to fix crashes. These services collect pseudonymous identifiers, device information and usage events. They do not receive your health data or your quiz answers. Firebase Remote Config is used to adjust app settings such as ad frequency.
5. Purchases
Subscriptions are processed by Google Play. We never see or store your payment details. We only receive confirmation that a subscription is active so we can unlock Premium.
6. Children
GrowMax is intended for users aged 13 and over. We do not knowingly collect personal information from children under 13. If you believe a child under 13 has used the app, contact us and we will help remove any related data.
7. Data retention and deletion
Guest data lives on your device; uninstalling GrowMax deletes it. Account data is kept until you delete your account, which removes your email and cloud backup within 30 days. To request deletion of analytics data associated with your device, email us at the address below.
8. Security
Data sent to Google services (AdMob, Firebase, Google Play) is encrypted in transit using HTTPS.
9. Not medical advice
GrowMax provides estimates for informational purposes only. It is not a medical device and does not provide medical advice, diagnosis or treatment. Consult a healthcare provider about growth concerns.
10. Changes
We may update this policy. The effective date above shows the latest version.
11. Contact
Questions or requests: xpertgamesco@gmail.com