What Apple Watch records
- Heart rate in the background all day, more often when you are still and densely during workouts.
- Heart rate variability (HRV) a few times a day, typically while you are still or asleep.
- Resting heart rate and walking average heart rate, calculated daily.
- State of Mind entries you log yourself in the Mindfulness app.
All of this goes into Apple Health. The watch just does not combine it into a stress number.
Kinds of stress app for Apple Watch
| Approach | How it works | Trade-off |
|---|---|---|
| HRV score apps | Turn HRV readings into a daily stress or recovery score | Few readings a day; says how you are, not why |
| Heart rate plus context | Show heart rate next to what you were doing | No single score; you read the pattern |
| Breathing apps | Guide you to calm down | Help recovery; do not measure causes |
Why context beats a score
A score of "high stress today" is hard to act on. "Your heart rate was high through the whole of Tuesday's planning meeting, and stayed up for an hour afterwards" is not. 70 BPM takes the second approach: it lines up the heart rate your Apple Watch recorded with your calendar, so each rise has a name.
Using your Apple Watch as a stress monitor
- Wear the watch snugly through the workday.
- Keep your calendar accurate: real start and end times.
- Review each evening, or once a week, for patterns.
- Separate physical causes (stairs, coffee, heat) from situations.
Not medical advice. 70 BPM shows heart-rate data your watch has already written to Apple Health. It is not a medical device and cannot diagnose anything. If your heart rate is often high at rest, or you have chest pain, dizziness or breathlessness, talk to a doctor.