Support

Undercurrent — Your daily wellness snapshot

Getting Started

Undercurrent reads health data from Apple Health to compute daily wellness scores. For the best experience:

• Grant Health Access — When prompted during onboarding, allow Undercurrent to read all requested health data types.
• Wear your Apple Watch — Continuous sensor data (heart rate, HRV, sleep) produces the most accurate scores.
• Give it a few days — Trends and pattern insights improve with more historical data. The Patterns & Tips section activates after 7+ days.

Frequently Asked Questions

Why does my score show 0 or "Waiting for data"?

This means Undercurrent hasn't received health data for today yet. Make sure you've granted HealthKit permissions in Settings and that your Apple Watch is syncing data to your iPhone.

What does the Body Score mean?

The Body Score (0–100) combines your stress level, recovery readiness, sleep quality, and cardiovascular fitness into a single number. Higher is better. Above 70 is a good day for intensity; below 50 suggests prioritizing rest.

How is Cardio Age calculated?

Cardio Age estimates your cardiovascular fitness age using VO2 Max, resting heart rate, heart rate recovery, and HRV. A cardio age lower than your actual age indicates above-average fitness.

Is my data sent anywhere?

No. All data stays on your device. Undercurrent has no servers, no accounts, no analytics, and no tracking. See our Privacy Policy for details.

Can I use the app without an Apple Watch?

Yes, but with limited functionality. The app can work with any health data in Apple Health, including manually entered data. However, automatic sensor data from Apple Watch provides the most complete picture.

Contact

Have a question, found a bug, or want to request a feature?