CardioWatch Pro

CardioWatch does two things. Every day, it tells you whether your body is tense or relaxed. And it puts to work the data your Apple Watch already records but mostly leaves unread in the Health app, finding how it connects and where it's heading. Every comparison is against your own usual, not population averages.

1. YOUR DAILY STRESS STATE
- Today in one sentence: where you are now, when today ran tightest, and whether it has eased since
- Stress timeline: your whole day on a 5-level scale, from subtle changes in the time between heartbeats (heart rate variability), compared with your own 30-day baseline; readings taken just after walking are marked
- Morning recovery: a score for this morning from your sleep and overnight data
- Weekly recap: which days ran tight or relaxed, summed up every Sunday evening

2. MORE FROM YOUR WATCH DATA: PATTERNS AND TRENDS

Your Apple Watch records far more than steps: heartbeat timing, resting and walking heart rate, sleep stages, breathing rate and wrist temperature overnight, exercise, workouts, VO₂ max, and how loud it is around you.

CardioWatch reads them together:
- Relationships: whether short nights, late bedtimes, big workouts or long sitting go along with how you are afterwards, and by how much
- Rhythms: which weekday tends to run tight, how much later your weekends run, how regular your days are
- Bounce-back: how long you usually take to recover after a low day or short night
- Body signals: resting and walking heart rate, breathing rate and wrist temperature during sleep, each against your own usual
- Noise around you: if your own last six months show your resting heart rate tends to run high on loud days, the home screen tells you on a day that's louder than usual
- Long-term trends: 7-, 30- and 90-day look-backs; changes that have lasted for months; heart rate at the same walking pace; cardio fitness (VO₂ max) and post-workout heart-rate recovery

Analysis starts after 7 days of data; differences too small to matt…