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Apple Watch and Apple Health with CPAP data

Your CPAP machine knows about your breathing. Your Apple Watch knows about your heart, your oxygen and your sleep. Apnealytics shows the two side by side: daily resting heart rate, HRV, SpO₂ average and low, sleep hours and weight from Apple Health, next to each night's AHI, usage and leak. Connecting Apple Watch CPAP data is free on every plan, and only daily summaries ever leave your phone.

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A wrist with a smartwatch resting on a white pillow in morning light

What syncs

Everything is a daily summary. Apnealytics does not read heart-rate samples, workout data, ECGs, Breathing Disturbances, or anything minute by minute. It asks Apple Health for one value per metric per day and nothing else. On Android, the same metrics come from Health Connect.

From Apple Health	Shown in Apnealytics	Why it matters
Resting heart rate (daily)	Vitals tile and trend	Often drifts down as therapy settles in
Heart rate variability, SDNN (daily)	Vitals tile and trend	A rough, noisy marker of recovery
Blood oxygen, average and lowest (daily)	Vitals tile and trend	A daily summary, not a night-long trace
Sleep hours (daily)	Beside machine usage hours	Shows the gap between sleep and mask time
Weight (daily, when logged)	Vitals tile and trend	Pressure needs can change with weight

Apple Watch and iPhone showing Apnealytics vitals tiles for resting heart rate, HRV, SpO2, sleep and weight beside last night AHI

Apple Watch sleep apnea notifications

Since watchOS 11, Apple Watch Series 9 and later and Ultra 2 can flag possible sleep apnea by tracking Breathing Disturbances with the accelerometer over many nights and notifying you if the pattern is consistent. The feature has regulatory clearance in a number of countries and is meant to prompt a conversation with a doctor, not to diagnose or to monitor treatment.

Two honest points about how this relates to Apnealytics:

Apnealytics does not read Breathing Disturbances or the notifications. Apple exposes them in the Health app but Apnealytics does not request them. If that changes we will say so here.
The two are complementary. The Watch may be how someone discovers they should get tested. Once they are on CPAP, the machine's SD card is the detailed record, and the Watch's daily vitals sit beside it. Many Apnealytics users came to therapy by that route.

How to connect

Install the Apnealytics app from the App Store.
Sign in with the same account you use at my.apnealytics.com.
Open Settings, then Apple Health, and tap Connect.
In the iOS permission sheet, turn on the five metrics you want to share. You can allow some and refuse others.
Daily summaries sync when you open the app
Nothing syncs in the background without the app running.

Android

Install the Apnealytics app from Google Play.
Sign in and open Settings, then Health Connect.
Grant the permissions you choose in the Health Connect sheet.
Daily summaries sync when you open the app.

Web

Vitals synced from your phone appear on the web dashboard too. The web portal itself cannot read Apple Health; the phone is the bridge.

Privacy

Only daily summaries leave your device: one number per metric per day.
You choose each metric separately and can revoke any of them in iOS Settings or Health Connect at any time.
Vitals are stored under the same row-level security as your therapy data, behind TLS, with no ads and no third-party trackers on health pages.
Push notifications never show health numbers on the lock screen.
Export or delete everything at any time; deletion completes within 30 days. See privacy and security.

Diagram: only daily summaries leave the device, one number per metric per day; heart-rate samples, ECG and Breathing Disturbances are never requested

What to look for

Resting heart rate and HRV are noisy from day to day; look at the 30-day trend, not single values. Sleep hours against usage hours shows the gap between how long you slept and how long the mask stayed on, which is the number the Goals and streaks feature tracks. Daily SpO₂ low from the Watch is a spot check rather than a trace; if you want the night-long picture, a dedicated oximeter on Pro gives you the overlay and ODI. See oximeters.

FAQ

Questions people ask

Help center →

Does Apnealytics work with Apple Watch?

Yes, through Apple Health on your iPhone. The Apnealytics app reads daily summaries of resting heart rate, HRV (SDNN), SpO₂ average and low, sleep hours and weight, and shows them beside your CPAP nights. It is free on every plan. Only daily summaries leave the device.

Does Apnealytics read Apple Watch sleep apnea notifications?

No. Apple Watch tracks Breathing Disturbances and can notify you of possible sleep apnea, but Apnealytics does not request that data from Apple Health. The Watch's role is to prompt a doctor's visit; Apnealytics tracks therapy from the machine's SD card once you are on CPAP.

Can Apnealytics use my Apple Watch as an overnight oximeter?

No. Apple Health provides a daily SpO₂ average and low, not a continuous overnight trace, and Apple Watch measures blood oxygen only periodically. For a night-long SpO₂ overlay you need a dedicated oximeter such as the Wellue O2Ring, which is a Pro feature.

Does Apple Health sync happen in the background?

Daily summaries sync when you open the Apnealytics app. Opening the app in the morning after your machine's data is imported gives you the full picture for the night. Card import itself is web-only; the phone shows what has been imported.

Does this work on Android?

Yes, through Health Connect. The Android app reads the same five daily metrics, with the same per-metric permissions, and shows them beside your therapy. The Android app is on Google Play.