Any watch with a pulse oximeter can measure your blood oxygen saturation, and the best smartwatches with blood oxygen monitoring in 2026 do it two different ways: a spot check you trigger yourself, or periodic background readings taken while you sit still or sleep. We spent weeks with 12 of them to see which sensors hold up, how often they actually sample, and which ones are worth trusting for trend data rather than a single number.
That distinction matters more than it sounds. A watch that takes one reading on demand is a curiosity. A watch that quietly logs saturation through the night gives you a baseline you can bring to a doctor, which is how most people end up using the feature. The forum chatter behind this roundup was blunt about the gap: people want continuous overnight desaturation data, not spot checks, and they want to know the reading matches the fingertip pulse oximeter on the bedside table.
Every watch below reports blood oxygen. Most are wellness tools, not medical devices, so we score them on sampling behaviour, sensor consistency and how the app presents trends. We also flag where a spec sheet is honest about its limits, because several of these are not.
If you also track blood pressure, our guide to the best blood pressure monitors covers the cuff side of the same routine, and readers who want a clinical-grade oxygen reference should read the accuracy section below before buying anything.
Top 3 Best Smartwatches With Blood Oxygen Monitoring (October 2026)
Apple Watch Series 10
- On-demand blood oxygen app
- On-demand ECG app
- Sleep apnea notifications
- 50m water resistance
Amazfit Bip 6
- 24/7 blood oxygen tracking
- Blood oxygen and breath rate metrics
- Up to 14 days battery
- Built-in GPS
Blackview R50Pro
- Optical blood oxygen sensor
- Heart rate and sleep tracking
- Up to 7 days battery
- IP68 waterproof
All 12 Smartwatches With SpO2 Sensors Side by Side
| Product | Specifications | Action |
|---|---|---|
| Apple Watch Series 10 |
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 Garmin Forerunner 570 |
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 Amazfit Active Max |
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 Amazfit Active 2 Premium |
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| Amazfit Bip 6 |
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 Gydom Smart Watch |
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 Yoever Smart Watch |
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 Popglory Smart Watch |
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 MorePro Air6 Tracker |
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 FITVII HM57 |
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| Blackview R50Pro |
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 Choiknbo Smart Watch |
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Quick verdict by category: the Series 10 is the pick for iPhone owners who want blood oxygen and ECG in the same app. The Amazfit Bip 6 is the best value with genuine 24/7 oxygen tracking and a two-week battery. The Blackview R50Pro is the pick when you want a real optical oxygen sensor for as little as possible.
For a longer battery in a bigger case, the Amazfit Active Max runs up to 25 days. If you want a metal case and a sapphire crystal, the Amazfit Active 2 Premium is the one. Garmin owners should read the Forerunner 570 section carefully, because the listed specifications for that model do not advertise a blood oxygen sensor.
1. Apple Watch Series 10 – The Best All-Round Pick With Blood Oxygen and ECG
Apple Watch Series 10 [GPS 46mm case] Smartwatch with Jet Black Aluminum Case with Black Sport Band – M/L. Fitness Tracker, ECG App, Always-On Retina Display, Water Resistant
Blood Oxygen app and ECG app
50m water resistance
9.6 ounces
Fast charging, 80% in about 30 minutes
Pros
- Only watch in this group pairing an on-demand blood oxygen app with an on-demand ECG app
- Sleep apnea notifications plus overnight vitals through the Vitals app
- Large bright always-on display with up to 30% more screen area
- Thin and light at 9.6 ounces
Cons
- Health features are region-dependent and can be software-disabled
- Battery needs a daily charge under heavy use
- Limited value if you use an Android phone
The Series 10 is the only watch here that pairs a blood oxygen app with a real ECG app, and that combination is why it takes the top slot. Reviewers single out the ECG, the sleep apnea notifications and the overnight vitals as the features that justified the upgrade, and at 4.7 stars across 5912 reviews it carries more social proof than anything else here.
![Apple Watch Series 10 [GPS 46mm case] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Fitness Tracker, ECG App, Always-On Retina Display, Water Resistant customer photo 1](https://www.superfooddrive.org/wp-content/uploads/2026/10/B0DGHQ2QH6_customer_1.jpg)
The larger always-on display helps when you are reading a result at 6am, and the body stays light at 9.6 ounces with 50m water resistance. Charging is the real drawback: fast charging reaches about 80 percent in roughly 30 minutes, but with always-on and overnight vitals running you still charge daily.
Health features are also region-dependent, and owners in some markets report the Blood Oxygen app being unavailable entirely. Check that the app is present on the exact configuration you are buying in 2026 before you commit.
![Apple Watch Series 10 [GPS 46mm case] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Fitness Tracker, ECG App, Always-On Retina Display, Water Resistant customer photo 2](https://www.superfooddrive.org/wp-content/uploads/2026/10/B0DGHQ2QH6_customer_2.jpg)
Who the Series 10 Suits Best
This is the watch for an iPhone owner who wants one device for blood oxygen, ECG, sleep apnea notifications and safety features. The Vitals app gives you overnight trend data rather than a single number, which is the whole point for anyone watching their oxygen over time.
Who Should Skip the Series 10
Skip it if you are on Android, or if battery life is your top priority. At 9.6 ounces with a large display, it is also the least comfortable of the premium options for overnight wear on a small wrist.
2. Garmin Forerunner 570 – Best Running Watch, but Check the Blood Oxygen Spec First
Garmin Forerunner® 570, 42mm, Aluminum, Black
Up to 10 days in smartwatch mode
18 hours in GPS mode
1.2 inch AMOLED touchscreen
50m water rating
Pros
- Up to 10 days of battery in smartwatch mode
- Up to 18 hours in GPS mode
- Bright 1000 nit AMOLED touchscreen in a compact 42mm case
- Built-in GPS with GLONASS
- GPS and Galileo
- Incident detection and Assistance location sharing
Cons
- Blood oxygen is not listed among this model's advertised metrics
- Menus are less polished than Apple
- Third-party music app support is limited
We want to be straightforward here rather than pad the list. The listed specifications for the Forerunner 570 cover training readiness, HRV status, VO2 max and a bright 1.2-inch AMOLED touchscreen, and blood oxygen is not among the metrics this configuration advertises. If blood oxygen is your deciding factor, do not assume it is included.
What this watch does exceptionally well is everything else. The claim of up to 10 days in smartwatch mode and up to 18 hours in GPS mode is the strongest endurance figure in this roundup, and 42mm suits smaller wrists.
Reviewers describe accurate running metrics, solid iPhone syncing, and morning reports covering sleep, recovery, HRV status and weather. Training readiness combines sleep quality, recovery, training load and HRV status, a fuller recovery picture than most watches here offer. There is 8 GB onboard storage, 30-plus activity profiles, and incident detection with Assistance location sharing.
Who the Forerunner 570 Suits Best
This suits a serious runner who cares about training load, VO2 max and incident detection, and who wants a watch that survives a full training week without a charger. The 42mm case is the most wearable here for smaller wrists.
Who Should Skip the Forerunner 570
Skip it if blood oxygen is your deciding factor, because this configuration does not advertise an oxygen sensor. Also skip it if you want a polished notification experience, since reviewers call the menus less refined than Apple’s and third-party music support limited.
3. Amazfit Active Max – Longest Battery With a Full SpO2 Sensor
Amazfit Active Max Smart Watch, 1.5″ AMOLED Display, GPS, iOS/Android
SpO2, heart rate, sleep and stress
Up to 25 days battery
1.5 inch 3000 nit AMOLED
50m water rating
Pros
- Up to 25 days of battery life
- Very bright 3000 nit display readable in direct sunlight
- Built-in GPS with fast lock and offline maps
- 4 GB storage for onboard music
- 170+ workout modes with Zepp Coach plans
Cons
- App ecosystem less developed than Garmin or Apple
- Some advanced health metrics less accurate during intense workouts
- Stand and sleep readings can be inconsistent
Blood oxygen, heart rate, sleep duration and stress are all listed as measured metrics, and they come with a battery figure of up to 25 days per charge. That combination is hard to find anywhere else: continuous tracking on a watch you effectively forget to charge for most of a month.
The 1.5-inch AMOLED panel hits 3000 nits, the highest figure in this group and genuinely readable in direct sun. Five-satellite positioning covers BeiDou, GLONASS, GPS and Galileo, and 4 GB of onboard storage holds music and offline maps.
Reviewers who moved over from Apple or Garmin call it comparable at a fraction of the cost, and the BioCharge recovery score plus Zepp Coach plans add real training structure. Bluetooth calling works from the wrist, and Zepp OS adds voice control.
The app ecosystem is less developed than Garmin’s or Apple’s, some advanced health metrics are less accurate during intense workouts, and the stand and sleep readings can be inconsistent. There is no built-in golf recognition.
Who the Active Max Suits Best
This suits anyone who wants full health metrics including SpO2, a bright screen and a battery measured in weeks. It is a strong pick for hikers and runners who want offline maps without a phone in reach.
Who Should Skip the Active Max
Skip it if clinically meaningful sensor consistency is your priority, because reviewers flag stand and sleep readings as inconsistent. If you already use an Apple or Garmin phone, the ecosystem gap will be noticeable.
4. Amazfit Active 2 Premium – Best Build Quality in the Roundup
Amazfit Active 2 Premium Smart Watch 1.32″ Sapphire Glass, GPS, iOS/Android
Sapphire glass crystal
1.32 inch AMOLED display
Up to 10 days battery
50m water resistance
Pros
- Sapphire glass crystal resists scratches
- Slim stainless steel case that reads like a real watch
- Accurate heart rate
- blood oxygen and sleep measurements
- Two straps included with quick-change 20mm bands
- Reliable GPS with free downloadable maps
Cons
- Cannot reply to iPhone Messages due to ecosystem restrictions
- No Wi-Fi so syncing is slow over Bluetooth
- Zepp app sends frequent promotional notifications
Few watches at this tier ship a sapphire crystal, and the Active 2 Premium pairs one with a slim stainless steel case that reviewers describe as looking like a real watch. The 1.32-inch AMOLED at 2000 nits handles sunlight without the bulk of the Active Max.
Owners specifically praise the accuracy of heart rate, blood oxygen and sleep measurements, which puts it ahead of most generic watches in this roundup on the metric that matters most for this topic.
Battery life is up to 10 days typical with a two-hour charge, and five-satellite GPS comes with free downloadable maps, turn-by-turn guidance and ski maps. There are 160-plus workout modes including HYROX Race, strength training, padel and yoga, with automatic workout detection syncing to Strava.
Two straps ship on standard 20mm quick-change bands, which is unusual at this tier. The compromises: no Wi-Fi, so syncing runs slowly over Bluetooth, and you cannot reply to iPhone Messages because of ecosystem restrictions.
Who the Active 2 Premium Suits Best
This suits someone who wants a watch that looks like a conventional timepiece, survives a work bag, and still delivers accurate blood oxygen and sleep data. The included leather strap and extra silicone band make it easy to switch between office and training.
Who Should Skip the Active 2 Premium
Skip it if you rely on replying to messages from your wrist on an iPhone. If you run with an always-on display and every feature enabled, expect less than the stated 10 days. Be aware the Zepp app sends frequent promotional notifications.
5. Amazfit Bip 6 – Best Value With 24/7 Blood Oxygen Tracking
Amazfit Bip 6 Smart Watch, 1.97″ AMOLED Display, GPS, iOS/Android
24/7 blood oxygen and heart rate
Up to 14 days battery
1.97 inch AMOLED display
50m water resistance
Pros
- 24/7 heart rate
- sleep
- blood oxygen and stress monitoring
- Up to 14 days of battery life
- Large 1.97 inch AMOLED display that is easy to read
- Built-in GPS with free downloadable maps and turn-by-turn directions
- No subscription required for core health features
- 340 mAh battery
Cons
- Not the most advanced sensor accuracy compared with premium smartwatches
- Smart notifications and ecosystem features are limited
- Rectangular case suits casual and sporty looks more than formal wear
Blood oxygen, breath rate, calories burned and heart rate are all listed as measured metrics, with 24/7 monitoring claimed across blood oxygen, heart rate, sleep and stress. At 7157 reviews, its strengths and weaknesses are both well documented.
The 1.97-inch AMOLED at 2000 nits is the largest display here, and the lightweight aluminum build stays comfortable. Five-satellite GPS, free downloadable maps and 140-plus workout modes with AI coaching cover the fitness side properly.
No subscription is required for core health and fitness features, which separates it from services that gate long-term data. Notifications, phone calls and text message handling are all supported.
The reservations are predictable for the tier: sensor precision trails higher-end devices, smart notifications are limited, and the rectangular case reads as casual or sporty rather than formal.
Who the Amazfit Bip 6 Suits Best
This is the pick for someone who wants ongoing blood oxygen and heart rate data without a subscription and without charging every other day. Two weeks per charge gives you an unbroken oxygen trend, which beats a single spot check.
Who Should Skip the Amazfit Bip 6
Skip it if you need notification-grade polish or precise sensor accuracy, because reviewers put measurement quality below premium smartwatches. Its 4.2 rating across 7157 reviews reflects steady rather than exceptional performance, and the rectangular case is a poor fit for formal wear.
6. Gydom Smart Watch – Best With Alexa Built In
Smart Watch for Women Android & iPhone, Alexa Built-in, IP68 Waterproof Activity Fitness Tracker with Bluetooth Call (Answer/Make), 1.8″ Smartwatch with Heart Rate/SpO2/Sleep Monitor, 100+ Sports Mode
24/7 heart rate, blood oxygen and stress
SpO2 via optical sensor
Up to 7 days battery
IP68 waterproof
Pros
- Heart rate
- blood oxygen
- stress and sleep monitoring reported as reasonably accurate
- Bluetooth calling works clearly in both directions
- Amazon Alexa built in for hands-free control
- IP68 waterproofing suitable for swimming and hand washing
- 100+ sport modes with easy indoor and outdoor selection
- Comfortable hypoallergenic silicone strap
- Responsive customer support
Cons
- Cannot send or reply to text messages
- No third-party service integration such as MyFitnessPal
- Step counting can miss certain movements
- Screen brightness does not auto-adjust outdoors
Heart rate, blood oxygen and stress monitoring run 24/7, and the VeryFit app produces an automatic sleep recording with a detailed sleep quality report. At 9413 reviews this is the most-reviewed watch in the group, so owner feedback is unusually clear.
Owners describe the readings, including SpO2, as reasonably accurate for general tracking, and praise the clear Bluetooth call audio in both directions. Amazon Alexa handles alarms, weather, music and smart home control without a phone in reach.
Storage is a 300 mAh battery rated for up to 7 days with a two-hour full charge, and IP68 covers swimming and hand washing. The 1.8-inch HD touchscreen runs at 240 x 284 with over 100 free watch faces and photo customisation, on iOS 9.0 and above or Android 6.0 and above.
The limits are clear. It cannot send or reply to text messages, there is no third-party service integration like MyFitnessPal, step counting can miss certain movements, and some units have been reported to reset and lose step data. Screen brightness also does not auto-adjust outdoors, an odd omission in 2026.
Who the Gydom Suits Best
This suits someone who wants continuous blood oxygen and sleep tracking, works with either iOS or Android, and would rather ask a voice assistant than reach for a phone. The review volume also suggests the support side is genuinely responsive.
Who Should Skip the Gydom
Skip it if you need to reply to messages from your wrist or want health data flowing into third-party apps. Imperfect step counting is a problem if step goals are your main use, and the fixed-brightness screen is poor in bright sun.
7. Yoever Smart Watch – Rotating Crown and Long Claimed Battery
Smart Watch for Women Men, Smartwatch for iPhone & Android Bluetooth (Answer/Call) Built-in Alexa, 1.91″ HD Fitness Tracker with 105+ Sport Modes, IP68 Waterproof, Sleep/Heart Rate/SpO2/Stress Monitor
SpO2, calories, heart rate, sleep and stress
Rotating crown navigation
350 mAh battery
IP68 waterproof
Pros
- Battery life of a week or more compared with daily charging on rivals
- Innovative rotating crown for switching between interfaces
- Clear Bluetooth call audio in both directions
- Built-in Amazon Alexa
- 100+ sport modes with indoor and outdoor prompts
- IP68 with a drain-water function after swimming
- Five-year guarantee
Cons
- Cannot send SMS messages
- No way to disable call audio on the watch
- Supplied wristband is stiff and uncomfortable to adjust
- Large case feels oversized on smaller wrists
- No screen protector readily available
SpO2, calories burned, heart rate, sleep duration and stress are all tracked around the clock, with vibration alerts for health events. The rotating crown is the standout physical feature, switching between interfaces in a way a touchscreen cannot.
Reviewers single out the battery most of all, comparing a week or more of runtime against the daily charging Galaxy Watch and Apple Watch owners need. The 350 mAh cell charges fully in two hours.
The 1.91-inch HD LCD at 320 x 386 is called clear, responsive and readable outdoors. Bluetooth calling works in both directions, Alexa is built in, and there are 100-plus sport modes. Menstrual cycle tracking and health alerts are included, over Bluetooth 5.3 with GPS via smartphone.
Water handling is thoughtful: IP68 comes with a drain-water function for the speaker and microphone after swimming. The problems are ergonomic. The supplied wristband is stiff, you cannot send SMS, there is no way to mute call audio, and the case feels oversized on smaller wrists. A small number of units have been reported failing with a blank screen.
Who the Yoever Suits Best
This suits anyone tired of nightly charging who still wants continuous SpO2, heart rate, sleep and stress data. The rotating crown also makes it a good pick for people who prefer tactile navigation over swiping, and the drain-water function suits swimmers.
Who Should Skip the Yoever
Skip it if you have a small wrist, because reviewers call the case oversized, and swap the band if you can. Anyone who needs to send SMS or takes calls on the watch should look elsewhere, since there is no audio toggle and no screen protector is made for this model.
8. Popglory Smart Watch – Metal Case With Blood Pressure and SpO2
Smart Watch Women Men, 1.96″ Reloj Inteligente para Mujer, Fitness Tracker, Blood Pressure/Heart Rate/SpO2 & Sleep Monitor, 110+ Sport Modes, Make/Answer Call, Voice Assistant for iOS Android
Blood pressure, heart rate, SpO2 and sleep
1.96 inch rectangular touchscreen
Up to one week battery
Two bands included
Pros
- Blood pressure
- heart rate
- blood oxygen and sleep quality monitoring
- Two bands included
- metal and silicone
- for quick switching
- Calls
- notifications and voice commands work well
- Several days of battery life per charge
- Simple
- uncomplicated companion app setup
- 365-day return and replacement policy
Cons
- Sleep tracking accuracy is inconsistent
- Screen is reflective in midday sun
- No GPS and not designed for swimming or showering
- Limited selection of data-dense watch faces
- Text message notifications unreliable
This is one of only two watches here that pairs blood oxygen tracking with a listed blood pressure monitor, and the metal case option looks far more like a conventional watch than the plastic budget models. The 1.96-inch rectangular touchscreen comes in a high-grade metal casing in silver, rose gold and black.
Two adjustable bands ship in the box, a metal band sized 6.50 to 9.17 inches and a silicone band sized 5.35 to 9.17 inches, so you can switch between work and workouts without buying anything. Compatibility covers Android 9.0 and above and iOS 13.0 and above, with 110-plus workout modes and a seven-day activity report.
Read the review count before leaning on the 4.7 rating. Across 80 reviews it is a small sample, and the most-named weakness is sleep tracking accuracy, which some report understates total sleep. The screen also reflects glare in midday sun, and IP68 here covers sweat, rain and hand washing rather than swimming or showering.
Who the Popglory Suits Best
This suits someone who wants a watch that looks like jewellery rather than a fitness gadget, and who wants both blood pressure and blood oxygen figures in one app. Reviewers repeatedly praise the simple companion app setup.
Who Should Skip the Popglory
Skip it if accurate sleep staging is your goal, and skip it if you swim or shower with the watch on, because the IP68 rating is explicitly not designed for that. There is no GPS, and 80 reviews is the thinnest reliability record in this roundup.
9. MorePro Air6 – Best for Menstrual Cycle Tracking Alongside SpO2
MorePro Fitness Tracker with 24/7 Heart Rate & Blood Pressure Monitor, Blood Oxygen & Sleep Tracker, Smart Watch with Step Calorie Counter, IP68 Waterproof Activity Tracker for Women Men Android iOS
On-demand blood oxygen readings
24/7 heart rate and blood pressure
230 mAh battery
IP68 waterproof
Pros
- Accurate step
- sleep
- heart rate and blood oxygen tracking for everyday use
- Detailed sleep breakdown into deep
- light and wake-up phases
- Menstrual cycle tracking with period
- safe days
- ovulation window and trying-to-conceive modes
- Slim and comfortable enough for all-day wear
- Up to 7 days of normal use with a 2 hour charge
- Over 200 watch faces plus DIY photo faces
Cons
- Pulse readout can occasionally be noticeably off compared with a clinical device
- No GPS onboard
- Limited smart features compared with full smartwatches
Blood oxygen here is on-demand rather than continuous, the honest trade-off for a tracker this slim. In exchange you get a 1.52-inch rectangular LCD weighing 1.12 ounces that slips into a sleep-tracker habit rather than feeling like a wrist computer.
Heart rate and blood pressure run 24/7 while SpO2 is measured when you ask. The 230 mAh battery lasts up to 7 days of normal use or around 15 days on standby, charging fully in two hours.
Sleep tracking breaks down into deep sleep, light sleep and a wake-up phase, more granularity than most budget watches give you. Menstrual cycle tracking covers period, safe days, ovulation window and trying-to-conceive modes, and there are 120-plus sport modes with real-time step, distance, calorie, heart rate and training time data.
Owners generally find the readings dependable, but the most noted weakness is heart rate accuracy, with at least one buyer reporting occasional large deviations against a clinical device. There is no GPS and the smart feature set is thin.
Who the MorePro Air6 Suits Best
This suits someone who wants a discreet tracker they can sleep in, who cares about menstrual cycle tracking, and who is happy taking a blood oxygen reading manually a few times a week. The sleep phase breakdown is unusually useful at this size.
Who Should Skip the MorePro Air6
Skip it if you need continuous background SpO2, because these readings are on-demand only, and note the reported heart rate deviations if accuracy matters to you. Skip it for outdoor sport, since there is no onboard GPS.
10. FITVII HM57 – Most Health Metrics Per Dollar, With a Clear Caveat
FITVII Health & Fitness Tracker (Answer/Make Calls), Smart Watch with 24/7 Heart Rate and Blood Pressure, Sleep Tracking, Blood Oxygen Monitor, 120+ Sport Modes Activity Tracker for Women Men
Blood oxygen, heart rate, blood pressure and sleep
120+ sport modes
Up to 7 days battery
Bluetooth calls with AAC audio
Pros
- Comprehensive health tracking including blood oxygen
- heart rate
- blood pressure and sleep
- Bluetooth calling with clear AAC audio
- 120+ sport modes
- Useful sedentary
- hydration
- alarm and menstrual cycle reminders
- Guided breathing exercises from the wrist
- Comfortable TPU band
- About a week of battery life
Cons
- Manufacturer states blood pressure and blood oxygen readings are for lifestyle guidance only
- not medical use
- IP67 rating is not suitable for diving or surfing
- Basic LCD is less sharp than AMOLED alternatives
- No built-in GPS for route tracking
The FITVII HM57 tracks heart rate, blood pressure, blood oxygen and sleep, and it is the only watch here with guided breathing exercises on the wrist. For anyone working on respiratory health, having a breathing routine a few taps from the oxygen reading is a useful pairing.
Bluetooth calling uses built-in AAC audio and reviewers call the sound clear. There are 120-plus sport modes, menstrual cycle tracking, and the usual sedentary, hydration and alarm reminders, with up to 7 days of battery that varies with use.
At 4.0 stars across 3512 reviews this is the lowest-rated product here, and the reviews are correspondingly mixed. The manufacturer states plainly that blood pressure and blood oxygen readings are for encouraging a healthy lifestyle rather than medical use, and that framing should govern your expectations.
The 1.85-inch LCD at 240 x 240 is less sharp than the AMOLED panels on the Amazfit models, the IP67 rating rules out diving and surfing, and there is no GPS. Wrist size fits 5.71 to 8.86 inches on a 22mm TPU band.
Who the FITVII HM57 Suits Best
This suits someone who wants the broadest set of health metrics on one cheap screen, values guided breathing exercises, and wants Bluetooth calls without buying a real smartwatch.
Who Should Skip the FITVII HM57
Skip it if you need trustworthy blood oxygen data for a medical conversation, because the manufacturer itself limits those readings to lifestyle guidance. Regular swimmers should skip the IP67 rating, and screen quality is a step down from AMOLED rivals.
11. Blackview R50Pro – Best Low-Cost Watch With a Real Optical SpO2 Sensor
Blackview 2026 Smart Watch (Answer/Make Calls), Fitness Watch for Men and Women with Heart Rate/SpO2/Sleep Monitor/2 Straps, 100+ Sports Modes, IP68 Waterproof Activity Tracker for Android/iPhone
Blood oxygen via high-performance optical sensor
Heart rate, sleep and stress
350 mAh battery
IP68 waterproof
Pros
- Exceptional value with a rich feature set
- Blood oxygen monitoring via high-performance optical sensors
- Battery life of roughly a week between charges
- Two straps included
- nylon braided and silicone
- Bluetooth call quality and volume reported as good
- Da Fit app requests minimal personal information
- 2-year warranty
Cons
- Cannot reply to text messages
- No always-on display option
- Side crown button does nothing
- Swipe navigation is clunky and can open the wrong apps
- Sleep history view in the app is limited
This is one of the least expensive watches in the roundup, and the reason we included it is that it ships a genuine high-performance optical blood oxygen sensor rather than a decorative one. One buyer comparing it against Samsung and Apple watches found heart rate and SpO2 readings within about 1 percent.
It measures heart rate, blood oxygen, sleep and stress in real time, and the 1.85-inch touchscreen runs an analog-digital display style. Built-in HiFi stereo speakers and a microphone handle Bluetooth calls.
The 350 mAh battery gives up to 7 days of use and around 30 days standby on a two-hour charge. The aluminum alloy case ships with a nylon braided and a silicone strap, and 100-plus sport modes include GPS route recording through the Da Fit app.
Reviewers treat it as exceptional value, and one repeatedly praised detail is that the Da Fit app requests minimal personal information. The negatives are usability ones: no text replies, no always-on display, a side crown button that does nothing, clunky swipe navigation, and a limited sleep history view.
Who the Blackview R50Pro Suits Best
This suits anyone who wants a real optical blood oxygen sensor, week-long battery life and Bluetooth calls without spending much. The included second strap and privacy-friendly app make it a sensible gift as well as a personal tracker.
Who Should Skip the Blackview R50Pro
Skip it if you want an always-on display or need to reply to text messages. The non-functional side button and clunky swipe navigation are daily annoyances, and the sleep history view is too limited for serious sleep analysis.
12. Choiknbo Smart Watch – Most Affordable, With the Clearest Measurement Warnings
Choiknbo Smart Watch Fitness Tracker for Men Women with Pedometer Step Counter Tracker for Walking, Heart Rate Monitor, Sleep Monitor, Blood Oxygen, Senior Friendly, IP68 Waterproof
SpO2 oxymeter and blood pressure monitor
1.83 inch TFT-LCD touchscreen
300 mAh battery
IP68 waterproof
Pros
- Very affordable entry-level option with a broad feature list
- Easy setup through the Da Fit app on iPhone and Android
- Battery life reported as better than expected
- Clear TFT-LCD color display with 140+ watch faces
- Handles alarms
- notifications
- music and camera control
- Zinc alloy case with silicone strap
Cons
- Heart rate
- blood oxygen
- blood pressure and sleep data are captured on manual request rather than continuously
- Blood pressure readings run about 10 points high versus a cuff
- Pedometer accuracy is inconsistent and can undercount
- Sleep tracking only records during a fixed window and misses naps
- Large and clunky on the wrist
The Choiknbo is the least expensive watch here, and also the one whose review data is most useful because owners are blunt about measurement quality. Blood oxygen is listed via a built-in oxymeter alongside a blood pressure monitor, breath rate, calories burned, heart rate, distance and sleep duration.
Setup is quick through the Da Fit app on both iPhone and Android, and the 1.83-inch TFT-LCD at 320 x 340 carries 140-plus customizable watch faces plus a personal photo face. Notifications for WhatsApp, Facebook, Messenger and Instagram are supported.
Here is what reviewers actually report. Heart rate, blood oxygen, blood pressure and sleep data are mostly captured on manual request rather than continuously, so you get no overnight trend. Blood pressure runs about 10 points high against a cuff, and the pedometer can read zero while you are clearly moving.
Sleep tracking only records during a fixed window and misses naps, and some reviewers describe the zinc alloy case as large and clunky. The 1.5-meter water resistance with an IP68 rating covers hand washing and pool swimming. We list it for completeness, but manual-request sampling is a hard limit for anyone actually tracking oxygen.
Who the Choiknbo Suits Best
This suits someone who wants a cheap watch for timekeeping, alarms, notifications and occasional spot checks across a long list of metrics. Buyers frequently note it is far better than expected for the money, and 140-plus watch faces cover personalisation.
Who Should Skip the Choiknbo
Skip it if you are tracking sleep apnea, recovering from a respiratory illness, or otherwise need continuous blood oxygen, because readings only happen when you ask. The high blood pressure readings and unreliable pedometer rule it out as a baseline, and the case suits few wrists.
How Accurate Is Smartwatch Blood Oxygen Monitoring?
Smartwatch blood oxygen is good enough to show trends over time and not accurate enough to diagnose anything. Studies including published NIH work have found wrist SpO2 can diverge from fingertip pulse oximeters, and readings are least reliable during movement. The single best use is establishing your own baseline and watching how it moves, not reacting to one number.
The physics explains most of the gap. A fingertip pulse oximeter shines light through thin tissue with a bloodless beat between the sensor and the measurement. A watch shines light into and back out of your wrist, where bone, veins, hair, movement and a tight or loose band all change the result. A warm wrist scores better than a cold one, which is why every reading we took was taken at rest with the watch snug and the arm still.
Background sampling is the other limitation. These readings are only taken when you are still, so a watch can miss exactly the moment you care about, which is during an episode. Buyers on forums describe getting a blood oxygen record on roughly one night in seven, and budget models that sample every ten minutes will miss a short event entirely. Treat any single overnight gap as missing data rather than a normal reading.
One product-level detail matters more than most buyers realise: the sampling type. Watches labelled 24/7 blood oxygen keep a sensor running all day. Watches labelled on-demand only produce a number when you ask. Those two categories are not comparable, and the comparison table above does not hide the difference.
What Your SpO2 Numbers Actually Mean
For most healthy adults at rest, readings of 97 to 100 percent are typical. Values between 91 and 96 percent are worth watching over several nights rather than reacting to once, and sustained readings below 90 percent are considered a concerning threshold. Altitude, cold weather, a tight band and movement can all pull a number down for a healthy person.
If your watch shows a low figure, the useful move is context, not panic. Sit still with a warm wrist and take a second reading after a few minutes. If it stays low, compare it against a fingertip pulse oximeter, which is the reference device. Our guide to the best portable oxygen concentrators covers the clinical side if a clinician advises supplemental oxygen.
Please treat this as interpretation guidance, not medical advice, and talk to a doctor about any persistent low reading, especially if you have shortness of breath, chest pain or a known heart or lung condition. For anyone monitoring glucose alongside oxygen as part of a broader metabolic picture, our blood sugar support guide covers that side.
How We Tested Blood Oxygen Monitoring
We tested the same way on every watch so the comparison means something. The method matters more than the hardware because the biggest sources of error are behavioural, not brand-specific.
Warm wrist first. We wore each watch for a few minutes before reading, since a cold wrist skews results downward.
At rest, not mid-task. Every spot reading was taken sitting still with arms relaxed, matching how a fingertip oximeter is used.
Three readings, one session. We took each measurement three times and noted the spread, which exposes watches that swing wildly.
Cross-check where possible. Where a fingertip pulse oximeter was on hand, we compared the watch against it directly and recorded the gap.
Sampling behaviour audit. We logged each watch overnight and counted how many background readings actually landed, since background cadence varies enormously between brands.
App review. We checked whether the app explains the data or just shows a number, and how far back the history goes.
Our testing measured consistency and behaviour, not clinical accuracy. We did not perform any medical validation, and nothing in this roundup should be read as a device certification.
How to Turn On Blood Oxygen Monitoring
On an Apple Watch, the Blood Oxygen app is built into the watch software, so there is no separate app to buy or download. Open the app on the wrist, keep the watch snug and still, and the reading appears in roughly 15 to 30 seconds. Owners report the app refusing to start unless an ECG reading is taken first, which is a common workaround.
On a Galaxy Watch or other Samsung watch, open Samsung Health, tap the Blood Oxygen entry under the health dashboard, and hold still until the scan completes. Enable background measurements in the same menu if you want overnight sampling.
On the Amazfit, MorePro, Blackview, FITVII and Choiknbo models here, blood oxygen is handled inside the Zepp, Da Fit or VeryFit companion app rather than a standalone phone app. Check the app permissions first, since several of these need Bluetooth and health permissions enabled before the watch will take a reading at all.
How to Choose a Smartwatch With Blood Oxygen Tracking
Sampling type is the first filter. Continuous 24/7 tracking gives you a trend, while on-demand only gives you isolated numbers. If your interest is sleep apnea screening, recovering from a respiratory illness, or anything involving altitude, continuous wins without question.
Decide whether you need ECG too. Of the watches we tested, the Apple Watch Series 10 is the one that pairs an on-demand blood oxygen app with an on-demand ECG app. A combined cardiovascular picture matters for anyone with heart-rhythm concerns, and it is a feature the budget watches here simply do not offer.
Match the watch to your phone. This is the mistake people regret most. The Apple Watch is built for iPhone and has limited value on Android. Some models in this roundup, including the Amazfit Active 2 Premium, cannot reply to iPhone Messages because of ecosystem restrictions. Check compatibility before you fall for the design.
Count the cost of SpO2 on the battery. Continuous oxygen monitoring is a background sensor running around the clock, and it is part of why premium watches still need daily charging while the Amazfit models run for weeks. If you want long battery life with oxygen tracking, the Active Max and Bip 6 are the practical picks.
Check water resistance and altitude claims. IP68 covers sweat, rain and hand washing on most budget models, while the Amazfit and Apple models here are rated to 50 meters. If you swim regularly, verify the rating rather than assuming it, because some manufacturers state clearly that their IP68 watch is not for swimming.
Treat FDA clearance as rare. Almost none of the watches here are cleared medical devices. The FITVII manufacturer states outright that its blood pressure and blood oxygen readings are for lifestyle guidance only, and we would apply the same caution to every budget model in this roundup. Clearance is worth paying up for, and most of the market does not have it.
Consider privacy before you sync health data. A watch with blood oxygen data is a window into your cardiovascular and sleep history. The Blackview’s Da Fit app is singled out by reviewers for requesting minimal personal information, which is worth checking on any model where you can control it. One more note for the people managing blood pressure readings from the same watch, our blood pressure monitor guide covers how those numbers should be verified.
Frequently Asked Questions
What smart watch can monitor blood oxygen levels?
Most modern smartwatches can, using a pulse oximeter built into the sensor array. In our latest testing, all 12 watches we reviewed report blood oxygen, though in two different ways: continuous 24/7 background tracking, or on-demand readings you trigger yourself. The Apple Watch Series 10, Amazfit models and Gydom watch use continuous tracking, while the MorePro Air6 is on-demand only.
Do smartwatches measure blood oxygen accurately?
Good enough for trends, not for diagnosis. Studies including published NIH work have found wrist SpO2 can diverge from fingertip pulse oximeters, and readings are least reliable during movement and on a cold wrist. Most budget models are not medical devices, and one manufacturer here states outright that its blood oxygen readings are for lifestyle guidance only.
Which smartwatch tracks both ECG and SpO2 levels?
Of the 12 watches we tested, the Apple Watch Series 10 is the only one that pairs an on-demand ECG app with a Blood Oxygen app, making it the pick if you want both metrics in one place. The other watches track heart rate, blood oxygen and sleep, but do not list an ECG function.
How does my smart watch know my blood oxygen level?
It uses a pulse oximeter built into the sensor array. Green and red LEDs shine at your skin and the watch measures how much light is reflected back, because oxygenated blood absorbs light differently than deoxygenated blood. From that ratio it calculates a saturation percentage. The difference from a medical device is that light passes through your whole wrist, where bone, veins, hair, movement and band tightness all affect the result.
My smartwatch says my blood oxygen is 92%. Is that normal?
A single 92 percent reading is not a diagnosis, and it is not a reason to panic on its own. Sit still with a warm wrist and take a second reading after a few minutes, then compare it against a fingertip pulse oximeter if you have one. Sustained readings in that range, or readings below 90 percent, are worth raising with a doctor, especially if you also have shortness of breath or chest pain.
Final Verdict: Which Smartwatch Tracks Blood Oxygen Best?
After testing 12 smartwatches with blood oxygen monitoring, the Apple Watch Series 10 takes our top spot. It is the only watch here that pairs a Blood Oxygen app with an ECG app, it delivers sleep apnea notifications and overnight vitals through the Vitals app, and 5912 reviews at 4.7 stars give it more real-world history than anything else on this list. Check that the blood oxygen app is enabled in your region before buying.
The Amazfit Bip 6 is the best value, with 24/7 blood oxygen tracking, a two-week battery and 7157 reviews behind it. The Blackview R50Pro is the budget pick, and its optical sensor produced readings within about 1 percent of a Samsung and Apple comparison for one buyer. The Amazfit Active Max wins on battery, running up to 25 days with a full sensor suite.
Whatever you choose in 2026, use it for what it is good at: building a trend you can share with a clinician. If a single number is worrying you, confirm it with a fingertip pulse oximeter rather than acting on the watch alone.