Read your wrist sensors beside your snoring, and connect any wearable through Apple Health.
Snore Timeline listens through your phone, but your Apple Watch adds a second layer to the night: heart rate, heart rate variability, blood oxygen, and more, measured at your wrist while you sleep. This page covers the watch companion app, the live view during a recording, the biometrics that sit beside your snoring in the morning, and how Apple Health ties everything together so wearables like Oura, Whoop, and Garmin can join in too.
Every number on this page comes from your watch's own sensors, read through Apple Health. They are shown for your awareness and for sharing with a doctor. They are not a medical evaluation, and Snore Timeline does not diagnose any condition.
Snore Timeline includes a companion Apple Watch app bundled with the iOS app, so there is nothing extra to buy or install. It lets you start and stop a recording from your wrist, so you do not have to reach for your iPhone once you are already in bed. The watch app is iOS only.
Beyond the controls, the watch gives you three places to see your night:
The complications come in a few shapes. A Sleep Score widget is available in circular, corner, and rectangular styles and shows last night's score in a color gauge. An inline widget reads "Score [value] · [duration]", for example "Score 84 · 6h 42m", or "Recording sleep" when a session is in progress. While a session is active, a Live Activity appears in your Apple Watch Smart Stack with a red REC indicator, a live timer, and either "Listening" or a running count of detected signals.
When a recording session is active and your Apple Watch is in use, the watch app shows live readings from your wrist. You see your current heart rate and recent HRV samples, with a rolling view of roughly the last 10 to 30 minutes of heart rate.
When a session starts, the app looks back a short while for your most recent heart rate so it can show a value right away instead of waiting for the next sensor reading. HRV readings are uncommon from Apple Watch, often just a handful across a whole night, so the app may show a recent baseline value when the session itself has not produced a new one yet.
The phone shows the same Live Activity in your iPhone's Dynamic Island and Lock Screen. Siri, Shortcuts & Widgets covers the Live Activity and widget options in more detail.
If you wear your Apple Watch to bed and have Apple Health enabled, Snore Timeline reads six kinds of data your watch records overnight and shows them beside your snoring: sleep stages, heart rate, heart rate variability (HRV), respiratory rate, blood oxygen (SpO2), and wrist temperature. It combines these with its own audio analysis to give you broader context on the night. The watch is optional, and the app still works from audio alone if you do not have one.
On both the phone and the watch, these readings appear in a nightly biometrics card. The watch summarizes the headline numbers, and tapping through opens the detail screens:
On the phone's biometrics card, each metric carries a Good, Typical, Low, or Elevated rating and an inline sparkline so you can see how it moved across the night. These ratings are informational, never a diagnosis.
Wrist temperature needs iOS 16 or later and an Apple Watch Series 8 or newer. On older watches that do not record it, the app leaves it out and everything else keeps working. The temperature value updates only when new readings arrive, so a partial sync will not replace a complete reading you already have.
Your full sleep data may not be there the moment you wake up. Apple Watch usually finalizes its sleep staging 1 to 3 hours after you wake, so the complete breakdown can arrive later. Snore Timeline watches Apple Health in the background and syncs automatically once the watch pushes the finalized stages, even if you never open the Health app. To refresh sooner, use the Re-import history button in Settings under Apple Health.
The Sleep Bank on the watch tracks how much sleep you have banked or borrowed over your recent week. It looks at your trailing 7 nights and compares each night against a goal of 7 hours of sleep. Nights above the goal build a surplus; nights below it build a deficit. The screen sums those differences into one balance so you can see, at a glance, whether the week left you ahead or behind.
The bar chart plots one bar per night across the week against the 7-hour goal line, and below it you see your average time asleep and the resulting Sleep Deficit or surplus. The app counts only nights that have sleep data, so a week with a few missed nights still reads correctly against the nights you did record.
For the duration of each night, the Sleep Bank prefers the sleep time Snore Timeline measured from your audio recording. On nights when you wore your watch but did not run a recording, or when you rely on a ring or band instead, it falls back to the sleep duration from Apple Health. That way the Sleep Bank stays complete whether you record every night, wear a wearable, or mix the two.
Apple Health is the bridge that lets Snore Timeline read your watch and write its own results back. To turn it on, open Settings in Snore Timeline, find the Health Integration section, tap the Apple Health toggle, and approve the permissions sheet that iOS shows. That single sheet covers everything the app reads and writes, with a checkbox for each data type, so you decide exactly what to allow in one place. You can turn the toggle off at any time, which disables all reading and writing at once, and you can fine-tune individual data types later in the iOS Health app's privacy settings.
The first time you enable it, the app pulls in the last 30 days of sleep data from Apple Health in one pass, so your recent nights are filled in right away.
What Snore Timeline reads (measured by your wearable): sleep stages, heart rate, HRV, respiratory rate, blood oxygen (SpO2), and wrist temperature on supported devices.
What Snore Timeline writes (all derived from your overnight audio, analyzed on-device): sleep analysis (time asleep and time in bed), sleep stages (light, deep, REM, and awake), and respiratory rate during sleep, stored in breaths per minute as the average across the night's samples. You can review this list in Settings under Apple Health. The app writes only its own analysis. It never writes data that came from other apps or devices, and it never overwrites readings from your Apple Watch or other wearables.
To bring in older history, tap Re-import history in Settings under Apple Health. This pulls every available night from all your sources, going back up to 2 years, and fills gaps without overwriting your existing data. When it finishes, the app shows a short summary, for example "imported 12 nights from Apple Watch, Apr 1 to May 30". If it finds no sleep data, it tells you that too.
Synced data can refine your sleep score. When Snore Timeline syncs from Apple Health, any night that also has a recording is re-analyzed so the app can update the score using the deep and REM sleep stages from your wearable, which measure those stages more accurately than audio analysis can. A night's score may improve on its own once your watch finishes finalizing its staging and that data reaches the app. Without a connected wearable, the app uses its own breathing- and movement-based estimates instead. The Sleep Stages page explains how those estimates work.
The dashboard also shows a hypnogram for the night: a band that maps when you moved through awake, REM, light, and deep stages, with the time you spent in each. When a night has data from more than one source, Snore Timeline keeps each source's stage timeline separate so you can compare them rather than blending them into one.
Apple Watch is not the only wearable Snore Timeline can read. Any device that writes its sleep data to Apple Health can feed the app, including the Oura Ring, Whoop, Garmin, and others. Snore Timeline reads only what those devices have written, and it never writes data on their behalf. If a night has data from more than one source, it keeps each source's sleep stage timeline separate so you can compare them side by side instead of merging them.
If you turn on Apple Watch sync, Snore Timeline shares your recorded sleep data with the companion app on your own Apple Watch so you can view it there. This stays within Apple's own device-to-device sync and is never sent to Snore Timeline servers. Everything the app reads from other wearables flows through Apple Health, and only after you allow it. The Privacy Policy has the full picture.
Whether you wear a watch, a ring, a band, or nothing at all, the recording itself works the same. The wearable adds context on top of the audio the app already captures. To get the most out of the combination, the Get Deeper Sleep Data guide walks through connecting a wearable and reading the night that results.
