Privacy Policy
Last updated: January 2025
The Short Version
Gist processes your health data entirely on your device. We do not collect, transmit, or store your data on any external servers. We have no analytics, no tracking, and no ads.
Data We Access
Gist requests read-only access to Apple HealthKit data to calculate your biological age. This includes:
- Sleep data (duration, stages)
- Activity data (steps, distance, exercise time, energy burned)
- Heart data (resting heart rate, HRV, walking heart rate)
- Body data (VO2 max, walking speed, BMI if available)
- Date of birth (to calculate chronological age)
How We Use Your Data
All calculations happen locally on your iPhone. Your health metrics are scored against research-based optimal ranges to generate your Gist Age. We never see this data—it never leaves your device.
Data Storage
The following is stored locally on your device only:
- Your birth date (for age calculation)
- Your Gist Age history (up to 90 days)
- App preferences
This data is stored using iOS standard storage (UserDefaults) and is deleted when you uninstall the app.
Data We Do NOT Collect
- We do not collect personal identifiers
- We do not use analytics or tracking
- We do not show advertisements
- We do not sell or share data (we don't have any)
- We do not require an account or login
- We do not require internet connectivity
HealthKit
Gist uses Apple HealthKit to read health data. Per Apple's requirements, we do not use HealthKit data for advertising or share it with third parties. HealthKit data is used solely to calculate your biological age within the app.
Your Rights
You can revoke Gist's access to HealthKit at any time in Settings → Privacy & Security → Health → Gist. Uninstalling the app removes all locally stored data.
Children's Privacy
Gist is not intended for children under 13. We do not knowingly collect data from children.
Contact
Questions about this policy? Contact me at vivek.dodia@icloud.com