You wake up, grab your watch, and there it is — a summary of 5 metrics from the night before. Blue (normal range) across the board. Or one is pink (outlier). You’re not sure if you should care.
That summary is Vitals — Apple’s overnight health tracker built into Apple Watch.
Here’s what you’re looking at.
What Vitals is
Vitals is an app introduced in watchOS 11. It runs while you sleep and gives you a morning readout of 5 key health metrics, compared against your personal baseline.
It’s not telling you if your numbers are “good.” It’s telling you if your numbers are normal for you. That distinction matters.
What it tracks
On Series 10, Vitals tracks all 5 metrics overnight:
- Heart rate — your resting heart rate during sleep
- Respiratory rate — how many breaths per minute
- Wrist skin temperature — variation from your personal baseline
- Blood oxygen — the percentage of oxygen in your blood
- Sleep duration — total time asleep
Each one is shown as either within your normal range or outside it. Over time, the app learns what’s normal for you specifically.
How to read the morning summary
You can check Vitals on your Apple Watch directly, or open the Health app on your iPhone for a bigger view with more detail. On iPhone, tap Search, then tap Vitals.
Either way, you’ll see the same thing: each metric listed as either within your typical range or as an outlier. Apple’s word for it is “Outlier” — that’s what shows up in the app when a metric is outside your normal. Blue means within range. Pink means outlier.
One outlier on its own is usually noise. Two or more outliers on the same night is the pattern worth paying attention to — and that’s also when Apple Watch sends you a notification.
One thing worth knowing: the baseline takes time to build. At the bottom of each view you’ll see a counter — “4 measurements” or “29 days.” The more data the app has, the more accurate your typical range becomes. Give it a few weeks before drawing conclusions.
Reading the 4 time views
The Vitals app in Apple Health has 4 views: D (day), W (week), M (month), and 6M (6 months). You’ll see them as tabs at the top.
Day view shows individual data points scattered across the day. You can see which metrics are blue (typical) and which are pink (outlier). It also shows the icons for each of the 5 metrics at the bottom so you can see which one is off.
Week view shows a bar for each day. A mostly blue week with one pink day tells a different story than a week where pink shows up repeatedly. This is where patterns start to emerge.
Month view gives you 30 days at a glance. You’ll see your typical range clearly, and outlier days stand out immediately as pink bars.
6-month view is the longest window. This is where you start to see seasonal shifts, the impact of lifestyle changes, or sustained periods of stress or recovery. If you’ve been consistent with sleep and training, you’ll see it here.
How I use it every morning
I check Vitals the same time I check HRV — right after waking up, before getting out of bed.
Check out our blog post on HRV explained here:
Most mornings everything is blue and I move on. But when something is pink, I pay attention to the pattern. One off night is usually noise. Two or three outlier nights in a row, especially across multiple metrics, usually means something is actually going on. Low sleep, high stress, the beginning of getting sick.
The combination is what tells the story. A single outlier metric doesn’t mean much. But low blood oxygen plus elevated heart rate plus reduced sleep duration on the same night — that’s worth taking seriously.
What to actually do with it
Check it every morning but don’t react to single readings. You’re looking for trends.
If you see multiple outliers on the same night, think back: did you drink the night before? Bad sleep? Hard training day? Usually there’s an obvious explanation.
If outliers keep showing up over several days with no obvious cause, that’s worth paying attention to. Vitals has caught early signs of illness before other symptoms show up — not always, but enough times that it’s worth checking.
The app pairs well with HRV. Both give you a morning picture of recovery. Together they’re more useful than either one alone.
The short version
Vitals gives you a 5-metric overnight summary every morning. Blue means normal for you. Pink means outlier.
Single readings are noise. Patterns are signal. Check it daily, use the week and month views to spot trends, and give it a few weeks to build your baseline properly.
