Blood oxygen and sleep apnea, checked September 15, 2026
The best wearable for blood oxygen and sleep apnea
Pulse oximetry (SpO2) estimates how much oxygen your blood carries, and some wearables now watch your breathing overnight for signs of sleep apnea. Apple Watch and Samsung Galaxy Watch are the two devices here whose sleep apnea features the FDA has cleared or authorized; the other overnight readings are wellness trends. None of these features is a diagnosis.
The ranking
12 devices scoredWe rank only devices whose feature we confirmed in official documentation or a published study, checked September 15, 2026. Every row links its source.
1
Apple WatchSmartwatchSleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3 look for breathing disturbances with the accelerometer and alert you after consistent signs across a 30-day window. You need at least 10 nights of wear, and the feature is for people 18 or older.Apple Support: sleep apnea notifications ↗922
Galaxy WatchSmartwatchSamsung's sleep apnea feature received FDA De Novo authorization in February 2024. It looks for signs of moderate to severe obstructive sleep apnea over two nights of tracking, for adults 22 and older, and needs a compatible Galaxy watch and phone.Samsung Newsroom, Feb 9, 2024 ↗903
Withings ScanWatchHybrid smartwatchIn a 2021 clinical study of 14 healthy adults, ScanWatch SpO2 readings were within about 3 percent (root mean square error) of arterial blood samples as oxygen saturation was lowered from 100 to 70 percent.JMIR 2021 (vs arterial blood) ↗844
Oura RingSmart ringMeasures average blood oxygen during sleep and flags possible breathing disturbances on Gen3 and newer rings, but only with an active Oura membership.Oura Support: Blood Oxygen Sensing ↗785
RingConnSmart ringGen 2 tracks SpO2 and runs automatic sleep apnea monitoring, which RingConn says is 90.7 percent accurate. Its product page does not cite an FDA clearance.RingConn Gen 2 ↗766
Google Pixel WatchSmartwatchBlood oxygen (SpO2), breathing rate and HRV are part of the free Base tier in the Google Health app, so no Premium is needed.Google Store: Base vs Premium ↗747
FitbitFitness trackerFitbit trackers report blood oxygen (SpO2) and breathing rate in the free Base tier of the Google Health app.Google Store: Base vs Premium ↗748
GarminSports watchPulse Ox can measure blood oxygen continuously while you sleep on watches such as the Forerunner 965. Garmin warns that unusual sleep positions can cause abnormally low readings.Garmin Forerunner 965 manual ↗729
Garmin CIRQAScreenless smart bandGarmin lists Pulse Ox among the band's 24/7 health metrics, next to skin temperature, stress and Body Battery.Garmin CIRQA launch, July 2026 ↗7210
Fitbit AirScreenless trackerGoogle lists SpO2, heart rhythm monitoring with AFib alerts, HRV and sleep stages among the screen-free band's around-the-clock tracking.Google: Fitbit Air launch ↗7011
PolarSports watchVantage V3, Vantage M3, Grit X2 and Grit X2 Pro take an on-demand SpO2 reading in 45 seconds. Polar says the measurement is not intended for medical or diagnostic use.Polar Support: SpO2 ↗6212
WHOOPRecovery bandWHOOP's developer documentation lists blood oxygen (spo2_percentage) in each recovery record, next to resting heart rate, HRV and skin temperature.WHOOP developer docs ↗60
Apple WatchSmartwatchSleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3 look for breathing disturbances with the accelerometer and alert you after consistent signs across a 30-day window. You need at least 10 nights of wear, and the feature is for people 18 or older.Apple Support: sleep apnea notifications ↗922Galaxy WatchSmartwatchSamsung's sleep apnea feature received FDA De Novo authorization in February 2024. It looks for signs of moderate to severe obstructive sleep apnea over two nights of tracking, for adults 22 and older, and needs a compatible Galaxy watch and phone.Samsung Newsroom, Feb 9, 2024 ↗903Withings ScanWatchHybrid smartwatchIn a 2021 clinical study of 14 healthy adults, ScanWatch SpO2 readings were within about 3 percent (root mean square error) of arterial blood samples as oxygen saturation was lowered from 100 to 70 percent.JMIR 2021 (vs arterial blood) ↗844Oura RingSmart ringMeasures average blood oxygen during sleep and flags possible breathing disturbances on Gen3 and newer rings, but only with an active Oura membership.Oura Support: Blood Oxygen Sensing ↗785RingConnSmart ringGen 2 tracks SpO2 and runs automatic sleep apnea monitoring, which RingConn says is 90.7 percent accurate. Its product page does not cite an FDA clearance.RingConn Gen 2 ↗766Google Pixel WatchSmartwatchBlood oxygen (SpO2), breathing rate and HRV are part of the free Base tier in the Google Health app, so no Premium is needed.Google Store: Base vs Premium ↗747FitbitFitness trackerFitbit trackers report blood oxygen (SpO2) and breathing rate in the free Base tier of the Google Health app.Google Store: Base vs Premium ↗748GarminSports watchPulse Ox can measure blood oxygen continuously while you sleep on watches such as the Forerunner 965. Garmin warns that unusual sleep positions can cause abnormally low readings.Garmin Forerunner 965 manual ↗729Garmin CIRQAScreenless smart bandGarmin lists Pulse Ox among the band's 24/7 health metrics, next to skin temperature, stress and Body Battery.Garmin CIRQA launch, July 2026 ↗7210Fitbit AirScreenless trackerGoogle lists SpO2, heart rhythm monitoring with AFib alerts, HRV and sleep stages among the screen-free band's around-the-clock tracking.Google: Fitbit Air launch ↗7011PolarSports watchVantage V3, Vantage M3, Grit X2 and Grit X2 Pro take an on-demand SpO2 reading in 45 seconds. Polar says the measurement is not intended for medical or diagnostic use.Polar Support: SpO2 ↗6212WHOOPRecovery bandWHOOP's developer documentation lists blood oxygen (spo2_percentage) in each recovery record, next to resting heart rate, HRV and skin temperature.WHOOP developer docs ↗60Explore it yourself
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What is the best wearable for blood oxygen and sleep apnea? Pulse oximetry (SpO2) estimates how much oxygen your blood carries, and some wearables now watch your breathing overnight for signs of sleep apnea. Apple Watch and Samsung Galaxy Watch are the two devices here whose sleep apnea features the FDA has cleared or authorized; the other overnight readings are wellness trends. None of these features is a diagnosis.
1Apple WatchSmartwatchSleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3 look for breathing disturbances with the accelerometer and alert you after consistent signs across a 30-day window. You need at least 10 nights of wear, and the feature is for people 18 or older.Apple Support: sleep apnea notifications ↗922Galaxy WatchSmartwatchSamsung's sleep apnea feature received FDA De Novo authorization in February 2024. It looks for signs of moderate to severe obstructive sleep apnea over two nights of tracking, for adults 22 and older, and needs a compatible Galaxy watch and phone.Samsung Newsroom, Feb 9, 2024 ↗903Withings ScanWatchHybrid smartwatchIn a 2021 clinical study of 14 healthy adults, ScanWatch SpO2 readings were within about 3 percent (root mean square error) of arterial blood samples as oxygen saturation was lowered from 100 to 70 percent.JMIR 2021 (vs arterial blood) ↗844Oura RingSmart ringMeasures average blood oxygen during sleep and flags possible breathing disturbances on Gen3 and newer rings, but only with an active Oura membership.Oura Support: Blood Oxygen Sensing ↗785RingConnSmart ringGen 2 tracks SpO2 and runs automatic sleep apnea monitoring, which RingConn says is 90.7 percent accurate. Its product page does not cite an FDA clearance.RingConn Gen 2 ↗766Google Pixel WatchSmartwatchBlood oxygen (SpO2), breathing rate and HRV are part of the free Base tier in the Google Health app, so no Premium is needed.Google Store: Base vs Premium ↗747FitbitFitness trackerFitbit trackers report blood oxygen (SpO2) and breathing rate in the free Base tier of the Google Health app.Google Store: Base vs Premium ↗748GarminSports watchPulse Ox can measure blood oxygen continuously while you sleep on watches such as the Forerunner 965. Garmin warns that unusual sleep positions can cause abnormally low readings.Garmin Forerunner 965 manual ↗729Garmin CIRQAScreenless smart bandGarmin lists Pulse Ox among the band's 24/7 health metrics, next to skin temperature, stress and Body Battery.Garmin CIRQA launch, July 2026 ↗7210Fitbit AirScreenless trackerGoogle lists SpO2, heart rhythm monitoring with AFib alerts, HRV and sleep stages among the screen-free band's around-the-clock tracking.Google: Fitbit Air launch ↗7011PolarSports watchVantage V3, Vantage M3, Grit X2 and Grit X2 Pro take an on-demand SpO2 reading in 45 seconds. Polar says the measurement is not intended for medical or diagnostic use.Polar Support: SpO2 ↗6212WHOOPRecovery bandWHOOP's developer documentation lists blood oxygen (spo2_percentage) in each recovery record, next to resting heart rate, HRV and skin temperature.WHOOP developer docs ↗60
Apple WatchSmartwatchSleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3 look for breathing disturbances with the accelerometer and alert you after consistent signs across a 30-day window. You need at least 10 nights of wear, and the feature is for people 18 or older.Apple Support: sleep apnea notifications ↗922Galaxy WatchSmartwatchSamsung's sleep apnea feature received FDA De Novo authorization in February 2024. It looks for signs of moderate to severe obstructive sleep apnea over two nights of tracking, for adults 22 and older, and needs a compatible Galaxy watch and phone.Samsung Newsroom, Feb 9, 2024 ↗903Withings ScanWatchHybrid smartwatchIn a 2021 clinical study of 14 healthy adults, ScanWatch SpO2 readings were within about 3 percent (root mean square error) of arterial blood samples as oxygen saturation was lowered from 100 to 70 percent.JMIR 2021 (vs arterial blood) ↗844Oura RingSmart ringMeasures average blood oxygen during sleep and flags possible breathing disturbances on Gen3 and newer rings, but only with an active Oura membership.Oura Support: Blood Oxygen Sensing ↗785RingConnSmart ringGen 2 tracks SpO2 and runs automatic sleep apnea monitoring, which RingConn says is 90.7 percent accurate. Its product page does not cite an FDA clearance.RingConn Gen 2 ↗766Google Pixel WatchSmartwatchBlood oxygen (SpO2), breathing rate and HRV are part of the free Base tier in the Google Health app, so no Premium is needed.Google Store: Base vs Premium ↗747FitbitFitness trackerFitbit trackers report blood oxygen (SpO2) and breathing rate in the free Base tier of the Google Health app.Google Store: Base vs Premium ↗748GarminSports watchPulse Ox can measure blood oxygen continuously while you sleep on watches such as the Forerunner 965. Garmin warns that unusual sleep positions can cause abnormally low readings.Garmin Forerunner 965 manual ↗729Garmin CIRQAScreenless smart bandGarmin lists Pulse Ox among the band's 24/7 health metrics, next to skin temperature, stress and Body Battery.Garmin CIRQA launch, July 2026 ↗7210Fitbit AirScreenless trackerGoogle lists SpO2, heart rhythm monitoring with AFib alerts, HRV and sleep stages among the screen-free band's around-the-clock tracking.Google: Fitbit Air launch ↗7011PolarSports watchVantage V3, Vantage M3, Grit X2 and Grit X2 Pro take an on-demand SpO2 reading in 45 seconds. Polar says the measurement is not intended for medical or diagnostic use.Polar Support: SpO2 ↗6212WHOOPRecovery bandWHOOP's developer documentation lists blood oxygen (spo2_percentage) in each recovery record, next to resting heart rate, HRV and skin temperature.WHOOP developer docs ↗60FAQ
What is the best wearable for blood oxygen and sleep apnea?
For most people, the Apple Watch is the best wearable for SpO2 and sleep apnea. Sleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3 look for breathing disturbances with the accelerometer and alert you after consistent signs across a 30-day window. You need at least 10 nights of wear, and the feature is for people 18 or older. The Galaxy Watch is a strong runner-up. That said, the "best" device depends on the rest of your goals. Vora can coach on SpO2 and sleep apnea data from any of them.
Is the Apple Watch or Galaxy Watch better for SpO2 and sleep apnea?
For SpO2 and sleep apnea specifically, the Apple Watch edges ahead (92 vs 90 in our scoring). Sleep apnea notifications on Series 9 or later, Ultra 2 or later and SE 3 look for breathing disturbances with the accelerometer and alert you after consistent signs across a 30-day window. You need at least 10 nights of wear, and the feature is for people 18 or older. However, Galaxy Watch may win overall if your other priorities differ.
Can Vora use SpO2 and sleep apnea data from any wearable?
Yes. Vora reads SpO2 and sleep apnea and related signals from Oura, WHOOP, Garmin, Apple Health, Fitbit, Samsung Health and more, then reconciles overlapping sources and turns the result into a daily plan. You keep your device; Vora is the coaching layer on top.
How is this Blood Oxygen ranking scored?
Each device is scored 0-100 on SpO2 and sleep apnea based on sensor quality, form factor and how the signal is captured (for example, overnight versus spot samples, or GPS versus inferred estimates). Pulse oximetry (SpO2) estimates how much oxygen your blood carries, and some wearables now watch your breathing overnight for signs of sleep apnea. Apple Watch and Samsung Galaxy Watch are the two devices here whose sleep apnea features the FDA has cleared or authorized; the other overnight readings are wellness trends. None of these features is a diagnosis.
Can a smartwatch detect sleep apnea?
Some can flag it. The FDA cleared Apple's Sleep Apnea Notification Feature on September 13, 2024 as an over-the-counter device to assess the risk of sleep apnea, and Samsung's feature received FDA De Novo authorization in February 2024 to detect signs of moderate to severe obstructive sleep apnea. Both flag possible sleep apnea. Neither is a diagnosis, so a notification is a reason to talk to a doctor.
Which Apple Watch models have sleep apnea notifications and blood oxygen?
Apple lists sleep apnea notifications for Apple Watch Series 9 or later, Ultra 2 or later and SE 3, after at least 10 nights of sleep tracking within 30 days, for people 18 or older. The Blood Oxygen app works on Series 6 or later and every Ultra, but not on SE. On watches bought in the US on or after January 18, 2024, the reading is calculated on the paired iPhone.
Does the Samsung sleep apnea feature work with an iPhone?
No. Samsung describes the feature as using a compatible Samsung Galaxy watch and phone.
Does Oura need a membership for blood oxygen?
Yes. Oura lists Blood Oxygen Sensing for Gen3 rings or later with an active membership, and it is not available on Gen2.
Keep exploring
Oura Ring
Ultrahuman Ring
Samsung Galaxy RingRingConn
Circular Ring 2
Amazfit Helio RingApple WatchGalaxy WatchGoogle Pixel WatchWithings ScanWatchGarmin
COROS
SuuntoPolar
AmazfitWHOOPFitbitFitbit AirGarmin CIRQA
Polar H10
Garmin HRM
Dexcom (Stelo / G7)
Abbott Lingo / Libre
Levels
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InBody
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Garmin Index S2Keep your wearable. Add a coach that acts on the data.
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