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Apple Watch and your CPAP data: what syncs, and what does not

Your Apple Watch records overnight SpO₂, resting heart rate, HRV and sleep. Apnealytics reads the daily summaries from Apple Health on your iPhone and shows them beside your CPAP nights. There is no standalone Apple Watch app yet, and this page is honest about what that means.

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Apple Watch and your CPAP data: what syncs, and what does not

How the data gets from your wrist to your dashboard

You sleep wearing the Watch.
watchOS writes blood oxygen readings, heart rate, HRV (SDNN) and sleep stages to the Health app on your paired iPhone overnight.
The iPhone app reads Apple Health.
With your permission, Apnealytics for iPhone reads daily summaries: resting heart rate, HRV, SpO₂ average and low, sleep hours and weight. Only those daily figures leave the device; raw per-second samples stay in Health.
They appear beside your therapy.
On the Vitals screen and the Home tiles, your Watch vitals sit next to the AHI, usage and leak from your CPAP card, on every device where you sign in, including the web portal.

What you will see

Each tile opens a chart with 30D, 90D, 1Y and All ranges and single-day drill-downs, drawn on the same timeline as your AHI trend.

Watch records	Shown in Apnealytics as
Blood oxygen (overnight readings)	SpO₂ average with the nightly low shaded
Heart rate	Daily resting heart rate
Heart rate variability	HRV (SDNN), daily
Sleep	Sleep hours per night
Weight (if logged in Health)	Weight trend, shown against your weight goal

What a Watch is good for on CPAP

Seeing whether a bad night was a bad night. An AHI spike alongside a higher resting heart rate and a lower SpO₂ low tells a fuller story than any one number.
Catching usage slips early. Sleep hours from the Watch next to usage hours from the machine make a gap obvious: six hours asleep, three on the mask.
Tracking the slow stuff. Resting heart rate and HRV often move over months as therapy settles. The 1Y view puts them next to pressure changes and mask swaps.

What a Watch is not

Apple Watch SpO₂ is a wellness feature with spot readings during sleep, not a continuous recording. For desaturation analytics (ODI₃, ODI₄, T90) overlaid on your night's waveforms, Apnealytics uses a recording pulse oximeter such as the Wellue O2Ring or a CMS50-family device. That is a Pro feature and the data is imported as a CSV or EDF export. See Oximeters.

Watch-based sleep apnea notifications, where available, are Apple's feature and stay in the Health app. Apnealytics does not read or interpret them.

Is there an Apple Watch app?

Not yet. Apnealytics does not have a standalone watchOS app, complications or a Watch face. Your Watch contributes data through Apple Health; the viewing happens on iPhone, iPad, Android or the web. A Watch app is not on the published roadmap today. If you would use one, tell us at info@apnealytics.com, because that is how we decide.

Setting it up

Make sure your Watch is recording sleep and blood oxygen in the Watch app on your iPhone (Sleep and Blood Oxygen settings).
Install Apnealytics for iPhone (App Store) and sign in.
Open Settings, tap Apple Health, and allow the categories you want to share. You can allow some and not others.
Vitals populate within a few minutes and update daily.

Full steps with screenshots are in Connect Apple Health. To disconnect, open the Health app, go to Sharing, choose Apnealytics and turn off the categories, or delete the app.

Privacy

Daily summaries only. Nothing per-second, nothing per-beat. Health data is never included in clinician share links by default, never appears in push notifications on your lock screen, and is never in our logs. You can export or delete everything, and deletion completes within 30 days. Read more at Privacy and security.

Free or Pro?

Apple Health sync, including everything your Watch contributes, is free. Pro adds oximetry overlays from a recording ring, per-night waveforms, full history and reports.

FAQ

Questions people ask

Help center →

Does Apnealytics have an Apple Watch app?

Not yet. There is no standalone watchOS app or complication. Your Watch's overnight SpO₂, resting heart rate, HRV and sleep reach Apnealytics through Apple Health on your iPhone, and you view them in the iPhone and iPad apps, on Android or on the web portal.

Can Apple Watch replace a pulse oximeter for CPAP?

Not for desaturation analytics. The Watch takes periodic spot readings; a recording oximeter like the O2Ring samples continuously all night, which is what ODI₃, ODI₄ and T90 need. Apnealytics shows Watch SpO₂ as a daily average and low, and overlays recording-oximeter data on waveforms on Pro.

What Apple Watch data does Apnealytics read?

Daily summaries only: resting heart rate, HRV (SDNN), SpO₂ average and low, sleep hours and weight. You choose which categories to allow in the Health app, and only those daily figures leave the device.

Does the web portal show my Watch data?

Yes. Once the iPhone app has synced a day's summaries to your account, the Vitals tiles and charts appear on the web portal, iPad and Android too. The web cannot connect to Apple Health directly, so the iPhone app does the reading.

Can I turn Apple Health off later?

Yes. Open the Health app on your iPhone, go to Sharing, select Apnealytics and switch off any category. Summaries already synced stay in your account until you delete them, which you can do from Settings.