Privacy Policy

Last updated: April 12, 2026

Introduction

Youthly ("we", "our", "us") respects your privacy. This Privacy Policy explains how we collect, use, and protect your information when you use our iOS application.

Information We Collect

We collect the following information, which is stored locally on your device:

• Nickname — A nickname you choose, used to personalize your experience.
• Age — Your chronological age, used to calculate your biological age.
• Quiz Answers — Your responses to lifestyle questions about sleep, exercise, diet, stress, and other health habits.
• Habit Tracking Data — Daily records of which habits you complete.

How We Use Your Information

Your quiz answers, habit tracking data, and profile information are stored locally on your device using Apple's SwiftData framework and are never transmitted to our servers. Your information is used solely to:

• Calculate and display your biological age estimate.
• Track your daily habit completions and streaks.
• Generate personalized protocol recommendations.
• Create shareable progress cards (only when you explicitly choose to share).

Third-Party Services

We use the following third-party services:

• RevenueCat — For subscription management and payment processing. RevenueCat may collect anonymous device identifiers and purchase data. See RevenueCat's Privacy Policy.
• AppsFlyer — For install attribution and analytics. AppsFlyer helps us understand which advertising campaigns bring users to the app. See AppsFlyer's Privacy Policy.

Advertising & Tracking

When you first open the app, we ask for your permission to track your activity across other companies' apps and websites using Apple's App Tracking Transparency (ATT) framework. This is entirely optional.

If you consent, we collect your device advertising identifier (IDFA) and share it with AppsFlyer and our advertising partners (such as TikTok) to:

• Measure the effectiveness of advertising campaigns that led you to the app.
• Attribute app installs to the correct ad source.
• Optimize ad delivery for relevant audiences.

If you decline, no advertising identifier is collected and no cross-app tracking occurs. You can change your choice at any time in iOS Settings → Privacy & Security → Tracking.

We also participate in Apple's SKAdNetwork for privacy-preserving ad attribution, which does not use your personal data.

Data Storage

All personal data is stored locally on your device. We do not operate servers or databases that store your information. If you delete the app, all local data is permanently removed.

Subscriptions

Subscription purchases are processed through Apple's App Store. Payment information is handled entirely by Apple and is never accessible to us.

Children's Privacy

Youthly is not intended for children under 13. We do not knowingly collect information from children under 13.

Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be reflected in the "Last updated" date above.

Contact Us

If you have questions about this Privacy Policy, please contact us at support@tryantiage.com.