Effective July 2, 2026
Nostresso is a stress-monitoring app for iPhone and Apple Watch. It is built around a simple principle: your health data never leaves your device.
None. Nostresso has no servers, no analytics, no advertising, no third-party SDKs, and no network connection of any kind. We cannot see your data, and neither can anyone else through us.
With your permission, Nostresso reads heart rate variability (SDNN), resting heart rate, respiratory rate, wrist temperature, step count, and sleep analysis from Apple Health to calculate your stress score and recovery metrics. All processing happens on your iPhone. With your permission it can also save mindfulness sessions back to Apple Health. You can revoke Health access at any time in Settings > Privacy & Security > Health.
Daily insights and goal recommendations are generated on-device using Apple's built-in Foundation Models. No health data is sent to Apple, to us, or to any third party.
Your stress history is stored locally on your iPhone and is included in your device backups under your control. Deleting the app deletes all data Nostresso has stored.
Nostresso is not directed at children under 13 and does not knowingly collect any personal information — from anyone.
If this policy ever changes, the updated version will be posted at this address with a new effective date.
Questions? Contact Michal Komar at michalkomar.com.