A 60-second HRV check on your Apple Watch, scored against your own normal, not a generic chart. See where you stand, and what's moving it.
No chest strap, no guesswork. Your Watch does the measuring; your phone does the thinking.
A 60-second guided breathing measurement runs on Apple Watch and captures your beat-to-beat heart rhythm, the basis for real HRV.
Your history, trends, and plain-language explanations all live in the iPhone app, clear, calm, and yours.
The score isn't absolute, it's calculated from your own history, so a number finally means something for you.
Two additions that turn a morning number into a whole day: a measured Rest Score, a modelled Body Energy that follows it, and a twenty-second check-in that keeps both honest.
Each morning, the night is scored from what your Watch measured while you slept: sleep HRV, sleep length, resting heart rate, breathing and wrist temperature, each against your own recent nights. That Rest Score is where Body Energy starts; activity, tension and rest then move it through the day.
A short, optional question: how rested do you feel? Answer on the phone or from the wrist. Over time StressCheck shows how your felt rest lines up with the measured night, and an optional reminder can follow your usual wake-up time.
The metrics researchers actually use, wrapped in an interface that never makes you anxious about your anxiety.
Beat-to-beat intervals from your Watch, artifact-cleaned and turned into lnRMSSD, the metric clinicians trust, not a vague "stress %."
A baseline engine learns your usual range, so each score is a deviation from your own normal, with a confidence rating, never false precision.
Long-term trends plus correlations with sleep, resting heart rate, respiratory rate, and the factors you tag yourself.
An on-device AI phrases your result in plain language. The numbers are computed by our code; the model never leaves your phone.
Add how you actually feel and what's going on. Over time, StressCheck shows which of your factors line up with better recovery.
Measure right from your wrist, glance at your latest score with iPhone & Watch widgets, and keep a full history in sync.
Your Watch reads the tiny timing changes between heartbeats that a finger-on-camera reading can't. Start a 60-second guided session on your wrist; your iPhone turns it into a score you can understand.
StressCheck reads from Apple Health and runs entirely on your device. There's no account and no server of ours, even the AI analysis runs on-device, so nothing about your heart is ever uploaded.
Take measurements, see your score and personal normal for free. StressCheck Plus unlocks the long game.
Start a 60-second guided session on your wrist. The Watch reads the tiny timing differences between your heartbeats, known as heart rate variability, and your iPhone turns that into one score you can read at a glance.
HRV varies enormously between people, so a number that means stress for one person is a calm day for another. StressCheck learns your own range and tells you where today sits inside it.
Yes. Unlimited measurements, your score, your personal normal, mood check-ins and the on-device AI analysis are all free, with no purchase needed. The free version keeps seven days of history; Plus opens the full record, with long-term trends, advanced metrics and correlations.
An Apple Watch and an iPhone. The Watch takes the reading, the iPhone does the thinking. No chest strap, no extra hardware and no account.
On your devices. StressCheck reads from Apple Health and runs entirely on device, even the AI analysis. There is no server of ours, so nothing about your heart is ever uploaded.
Once a day is plenty, ideally at a similar time and while sitting still. The trend over weeks tells you far more than any single reading.
The score is a snapshot of one measurement against your normal. Body Energy is a day-long estimate: it starts from last night's Rest Score and then spends or restores itself as your Watch records activity, an elevated heart rate without effort, calm hours and naps. It is modelled rather than measured, so the app labels it as an estimate and shows a confidence.
Only for the Rest Score and the morning check-in. Sleep HRV, sleep length, night heart rate, breathing and wrist temperature are all recorded while you sleep, so without a night of data the day starts from a neutral level with low confidence. Measurements, the score and everything else work as before.
Stop comparing yourself to a textbook. Measure on your wrist, understand on your phone, in 60 seconds.
