💡 Quick Answer
The sleep trackers with the best integration are Apple Watch (native to Apple Health), Oura Ring, WHOOP, Garmin, Withings, Eight Sleep and Ultrahuman, which write sleep to Apple Health. All but Apple Watch also reach Health Connect, although Withings publishes no Health Connect data list. Fitbit and Pixel Watch joined them in August 2026, when the Google Health app gained two-way Apple Health sync.
- Sleep duration and stages sync almost everywhere. HRV and proprietary scores often do not.
- Oura Readiness, WHOOP Recovery and Garmin Body Battery are not listed by Oura, WHOOP or Garmin among the data they share.
- Eight Sleep and Ultrahuman export HRV to Apple Health. Oura lists HRV for Health Connect only, WHOOP does not export it to Apple Health, and Garmin does not list it for either platform.
- On Android, the hub is Health Connect, not Google Fit.
If you track sleep with one device and train with another app, the question that matters is not "does it track sleep?" but "does the data leave the device's own app?" This guide answers that for the nine most common sleep trackers, with what is shared, what stays locked, and how to connect each one.
First, a Note on Names: Google Fit, Health Connect and Google Health
Google's naming has changed several times, which is why searches still mention "Google Fit":
- Google Fit is being retired. New integrations no longer target it.
- Health Connect is the on-device health data hub on Android, built into Android 14 and later. It plays the same role Apple Health plays on iPhone. For background, see our Apple Health vs Health Connect guide.
- Google Health is the new name of the Fitbit app, renamed in May 2026. It is the companion app for Fitbit devices and Pixel Watch.
From August 3, 2026, Google Health version 5.05 or later on iPhone syncs two-way with Apple Health. These types go both ways: steps, distance, floors, active calories, VO2 max, workouts and routes, sleep sessions and stages, heart rate, resting heart rate, SpO2, respiratory rate, body temperature, blood glucose, weight, body fat, nutrition, water, mindfulness and cycle tracking. HRV and skin temperature are read-only into Google Health: Google lists them among the types it can read from Apple Health but not among those it writes. To turn the sync on, open Google Health and go to Connections → Apps and services → Apple Health → Get started → Agree. Google documents Partner apps only for Health Connect on Android.
Sleep Tracker Integration Comparison (2026)
"Writes sleep" means the device's app saves sleep sessions into the platform where other apps can read them.
| Tracker | Type | Writes sleep to Apple Health? | Writes to Health Connect? | What's shared | What stays locked in the app |
|---|---|---|---|---|---|
| Oura Ring | Smart ring | ✓ Yes | ✓ Yes | Apple Health: sleep with stages, heart rate, respiratory rate, steps, active energy, workouts. Health Connect: sleep, heart rate, heart rate variability (HRV), steps, distance, active calories, exercise | Readiness and other Oura scores, temperature, SpO2 and resting heart rate are not listed by Oura; HRV is not listed for Apple Health |
| WHOOP | Screenless band | ✓ Yes | ✓ Yes | Sleep, resting heart rate, respiratory rate, SpO2, workouts and calories on both platforms; steps on Apple Health only if enabled in WHOOP settings and on Health Connect | HRV is not exported to Apple Health and not listed for Health Connect; Recovery and Strain scores are not listed by WHOOP |
| Apple Watch | Smartwatch | ✓ Native | ✗ No (iPhone only) | Sleep stages, heart rate, HRV, respiratory rate, SpO2 (where available), wrist temperature, workouts | Nothing significant; Apple Health is its home |
| Fitbit / Pixel Watch (Google Health) | Tracker / smartwatch | ✓ Yes (Google Health v5.05+, since Aug 2026) | ✓ Yes | Sleep sessions and stages, heart rate, resting HR, respiratory rate, steps, workouts on both platforms; SpO2 and mindfulness to Apple Health only (Google lists SpO2 as read-only for Health Connect) | HRV and skin temperature are not written to Apple Health; SpO2 is not written to Health Connect; Sleep Score, Daily Readiness and Cardio Load are not named on either of Google's lists |
| Samsung Galaxy Ring / Watch | Ring / smartwatch | Not listed by Samsung (no Apple Health sync documented) | ✓ Yes, via Samsung Health | Sleep sessions and stages, steps, distance, heart rate, blood oxygen, exercise sessions, weight and body fat | Samsung's own scores, HRV, resting heart rate, respiratory rate and temperature are not listed by Samsung; Samsung says activity tracker data is not synchronized with Health Connect |
| Garmin | Smartwatch | ✓ Yes, one-way (needs Garmin Connect open) | ✓ Yes, one-way | Sleep (Sleep Analysis on Apple Health, sleep stages on Health Connect), steps, distance, heart rate, workouts, active and resting energy, floors, weight and body fat | Body Battery and other Garmin scores are not listed by Garmin; Garmin does not list HRV among the data it shares with Apple Health or Health Connect |
| Withings (Sleep Analyzer / ScanWatch) | Under-mattress mat / hybrid watch | ✓ Yes (open the Withings app to sync) | Export documented; categories not listed by Withings | Apple Health: sleep, heart rate, resting heart rate, HRV, steps, workouts, blood oxygen, respiratory rate, body temperature, weight, body composition, blood pressure | Distance and active calories are not listed by Withings, and no Withings score other than Cardio Fitness is named |
| Eight Sleep | Smart mattress cover | ✓ Yes | ✓ Yes | Sleep stages, heart rate, HRV (rMSSD), respiratory rate | Sleep Fitness Score and Autopilot insights |
| Ultrahuman Ring | Smart ring | ✓ Yes | ✓ Yes | Sleep stages, heart rate, HRV, skin temperature, SpO2 (both platforms) | Recovery Score, Sleep Index and Movement Index (Ultrahuman's own scores) |
The pattern is consistent: raw measurements (sleep time, stages, heart rate) travel well, while the scores each company builds on top of them stay inside the company's app. Apple Health and Health Connect have no data type for "Readiness" or "Recovery", so even an open company has nowhere to put them.
How to Connect a Sleep Tracker on iPhone
Permission is granted from the tracker's app, then managed in the Health app.
- Open the tracker's app (Oura, WHOOP, Garmin Connect, Withings, Google Health, etc.) and find its Apple Health, Integrations or Data sharing setting.
- Turn it on. iOS shows a permissions sheet: switch on Sleep plus any heart rate, respiratory rate or HRV types offered.
- To check or change it later, open the Health app, tap your profile picture, then Apps (under Privacy), and pick the tracker. You can also go to Browse → Sleep → Data Sources & Access.
- Open the tracker's app once after waking. Garmin and Withings in particular push data when their app syncs, not in the background.
How to Connect a Sleep Tracker on Android
- In the tracker's app, find the Health Connect option (WHOOP: More → Account & Settings → Integrations; Withings: Profile → Export health data to Health Connect; Google Health: Connections → Partner apps).
- Approve the permission screen, making sure Sleep is allowed to be written.
- To review it, open Settings → Security & privacy → Health Connect → App permissions (the path varies slightly by phone maker) and select the app.
- Grant read access for sleep to any app that should use the data, such as your training app.
Why Your Sleep Data Doesn't Match Across Apps
Seeing 7h 12m in one app and 6h 48m in another is normal. Three things cause it:
- Different algorithms. Rings, wrist devices and mattress sensors measure different signals and use their own models to decide when you fell asleep and which stage you are in. None of them is a lab sleep study, and the same night can be scored differently.
- Duplicate sources. If you wear an Apple Watch and an Oura Ring, both write a sleep session for the same night. An app that reads every source may show inflated or overlapping totals.
- Apple Health's Data Sources priority. When several sources record the same type, Health uses the one at the top of the list for its own totals. New apps are added at the top automatically, so installing a new tracker can quietly change which device "wins". Fix it in Health → Browse → Sleep → Data Sources & Access → Edit and drag your preferred tracker to the top.
The practical fix: pick one primary sleep tracker, put it first in the priority list (or give only it sleep write access on Health Connect), and compare trends over weeks rather than single nights. Our sleep hygiene guide for athletes covers what to change once your data is reliable.
How to Choose a Sleep Tracker by Integration
Best for iPhone
Apple Watch writes everything natively, including HRV. If you prefer not to sleep in a watch, Oura exports sleep with stages to Apple Health; HRV and Readiness are not listed for Apple Health.
Best for Android
Pixel Watch or Fitbit via Google Health, or Samsung Galaxy Ring / Watch via Samsung Health, both of which write to Health Connect. If you might switch to iPhone later, note that Samsung documents no Apple Health sync, while Google Health now has one.
Best no-wearable option
Eight Sleep (mattress cover) or the Withings Sleep Analyzer (under-mattress mat). Eight Sleep syncs to Apple Health and Health Connect and also exports HRV. Withings documents an Apple Health export and a Health Connect export, publishes a category list only for Apple Health, and says Apple Health sync is not automatic, so the Withings app has to be opened for data to appear.
Best for HRV and recovery
Decide whether you want recovery insights or recovery data. WHOOP and Oura give polished recovery scores, but the scores are not listed by either company, WHOOP does not export HRV to Apple Health, and Oura lists HRV for Health Connect only; see our WHOOP vs Oura comparison. If you want HRV available to other apps, Apple Watch, Eight Sleep and Ultrahuman export it. For more on rings, read our smart rings guide.
How UltraFit360 Uses Your Sleep Data
UltraFit360 has bi-directional sync with Apple Health and Google Health Connect, so it can read the sleep, heart rate and HRV your tracker shares there, whichever device you use. That recovery data feeds the weekly AI coaching report, which looks at sleep and recovery trends alongside your training. Because it reads from the health hub, it can only use what your tracker exports, so the table above also shows what UltraFit360 can see. See all features.
Setup Guides by Device
- Garmin — one-way to Apple Health and Health Connect
- WHOOP — two-way sync; HRV not exported to Apple Health
- Oura — two-way sync; HRV exported to Health Connect only
- Fitbit and Pixel Watch — two-way with Apple Health and Health Connect
- Polar — Flow sends one way to Apple Health; Health Connect lists more
- COROS — Apple Health data listed; no Health Connect data list
- Withings — export and import; category list only for Apple Health
- Samsung Health — two-way with Health Connect; no Apple Health sync documented
Frequently Asked Questions
What connected sleep technology integrates with Apple Health or Google Fit?
Apple Watch, Oura Ring, WHOOP, Garmin, Withings, Eight Sleep, Ultrahuman and Fitbit or Pixel Watch (through the Google Health app) all write sleep data to Apple Health. On Android, Google Fit is being retired and Health Connect is the hub; Oura, WHOOP, Garmin, Google Health, Samsung Health, Eight Sleep and Ultrahuman write sleep to Health Connect. Withings documents a Health Connect export but publishes no list of its categories.
Which sleep trackers are known for good integration capabilities?
Apple Watch has the deepest Apple Health integration because it writes natively. Among third-party devices, Eight Sleep and Ultrahuman stand out because they also export HRV to both platforms. Oura lists HRV for Health Connect only, WHOOP states it does not export HRV to Apple Health, and Garmin does not list HRV for either platform. Oura and WHOOP both export sleep and respiratory rate to Apple Health.
What home fitness tech syncs with Apple Health or Google Fit?
Beyond wearables, Withings smart scales and the Withings Sleep Analyzer mat sync through the Withings app to Apple Health, and Withings documents a Health Connect export without listing its categories. The Eight Sleep Pod writes sleep stages, heart rate, HRV and respiratory rate to both. Google Fit is being retired, so on Android look for Health Connect support.
Does Fitbit / Google Health sync with Apple Health?
Yes, since August 3, 2026. The Fitbit app was renamed Google Health in May 2026, and version 5.05 or later on iPhone syncs two-way with Apple Health, including sleep sessions and stages, heart rate, resting heart rate, SpO2, steps, workouts and mindfulness. HRV and skin temperature are the two types Google lists as read from Apple Health but not written to it. To turn the sync on, open Google Health and go to Connections, Apps and services, Apple Health, Get started, Agree. Google documents Partner apps only for Health Connect on Android.
Does WHOOP send HRV to Apple Health?
No. WHOOP states it does not export HRV to Apple Health at this time, and HRV is not listed for Health Connect either. WHOOP exports sleep, resting heart rate, respiratory rate, SpO2 and workouts to Apple Health, and the Recovery score is not listed by WHOOP.
Why does my sleep data not match between apps?
Each device uses its own sleep-staging algorithm, so the same night can be scored differently. If two devices both write sleep to Apple Health, Health uses the Data Sources priority order to decide which one counts, and other apps may read a different source or both. Pick one primary sleep source and move it to the top of the list.
Sources
- Google Health Help: How do I use Apple Health with the Google Health app? — checked on October 9, 2026
- Google Health Help: How do I use Health Connect with the Google Health app? — checked on October 9, 2026
- Garmin Support: Sharing Your Garmin Connect Data With Apple Health — checked on October 9, 2026
- Garmin Support: Sharing Your Garmin Connect Data With Health Connect — checked on October 9, 2026
- WHOOP Support: Apple Health Integration — checked on October 9, 2026
- WHOOP Support: Health Connect Integration For Android — checked on October 9, 2026
- Oura Support: Apple Health Integration — checked on October 9, 2026
- Oura Support: Health Connect by Android Integration — checked on October 9, 2026
- Withings Support: What is Apple Health? — checked on October 9, 2026
- Withings Support: Exporting Withings data into Apple Health — checked on October 9, 2026
- Withings Support: Exporting Withings data into Health Connect — checked on October 9, 2026
- Samsung Developer: Accessing Samsung Health Data through Health Connect — checked on October 9, 2026
- Samsung Support: Use the Samsung Health app on your iPhone — checked on October 9, 2026
UltraFit360 brings your workouts, nutrition and wearable data together. See how the AI fitness tracker works with Apple Health and Health Connect.
Put Your Sleep Data to Work
Sync Apple Health or Health Connect with UltraFit360 and get recovery-aware training in your weekly AI coaching report.