Sometimes a number in NOYU won't match the one in your Garmin, Oura or Apple Health app. These are the common reasons.
We're measuring a different window
This explains most mismatches, and it's why we're careful with names.
Resting heart rate always means the daily figure your device calculates, so this one should match your device's app. Sleeping heart rate is the overnight average, a separate measurement that reads differently. HRV on its own always means the overnight figure, and daily HRV always means the all-day one.
If two numbers that sound similar disagree, check the label first. There's a fuller explanation in Resting and sleeping heart rate.
Your device reports a different HRV measure
RMSSD and SDNN are two ways of summarising the same beat-to-beat variation, and they produce different numbers from the same night. If your device's app displays one and NOYU is using the other, the two aren't meant to agree.
We pick whichever measure your device populates more consistently and stick with it, so your own history stays internally comparable. See Understanding your HRV.
The day a night belongs to
We follow the same convention as Apple Health: anything about waking up belongs to the day you woke, and bedtime belongs to the day you went to bed. So a night that starts on Tuesday evening and ends on Wednesday morning contributes its duration to Wednesday.
Some apps assign the whole night to the evening date instead, which shifts everything by one day compared to us.
Your scores are ours, not your device's
Your device may show its own recovery, readiness or sleep score. We don't import those. NOYU calculates its own from the underlying measurements, using a method we can explain and you can read.
Our scores won't match your device's, because different products weight different things. You can read how ours work in the explanation attached to each score in the app.
A score was calculated before all the data arrived
Recovery is set once, from the night that ended that morning, and it doesn't move during the day. Strain works the other way and keeps accumulating as your activity syncs, so it will climb through the day.
If you sync your device late, a day's numbers can change once the missing data lands.
We need enough of your own history first
NOYU measures wearable data against your own baseline rather than a population range, so we need a stretch of your history before a comparison means anything.
A score or comparison shows as unavailable instead of guessing. HRV stability, for example, stays out of Readiness until there are at least four nights to work from, because a number built from two days would look precise and tell you nothing.
Some measurements are estimates
Some of your device's numbers are measured well and others are inferred, which is worth knowing.
Most wrist wearables measure sleep duration, heart rate, HRV and step count reasonably well. Sleep stages are different. Your device estimates deep and REM percentages from movement and heart rate patterns, and they vary a lot both between devices and between people.
So NOYU will never tell you you're short of a deep sleep or REM target. We compare your stages to your own typical levels. Any product quoting you a fixed percentage target for deep sleep is claiming more confidence than the underlying measurement supports.
Still doesn't look right?
If a number looks wrong rather than differently defined, tell NOYU in the chat. Include what you're seeing and what your device says. That comes straight to us, and the mismatches members report are how we find the problems worth fixing.
