Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
The best SpO₂ activity tracker depends on whether you want a compact fitness band, a full smartwatch, a traditional-looking hybrid, or sports-focused training tools. For most Android users who want sleep and health features, the Samsung Galaxy Watch8 is the strongest all-round choice; the Withings ScanWatch 2 suits buyers who prefer a conventional watch, while Fitbit Charge 6 is a smaller activity-band option. Garmin is worth considering for its sports ecosystem, not because the available evidence proves it leads in oxygen-reading accuracy.
Important: Wrist-based SpO₂ readings are wellness estimates for personal trends, not medical monitoring. No device here replaces a fingertip pulse oximeter or clinical evaluation. A single low reading cannot diagnose a condition, and serious or worsening symptoms warrant medical attention regardless of a watch reading.
U.S. market guide, current as of August 18, 2026. Prices and feature availability can change; check the manufacturer’s current page and requirements before buying.
Recommended Free Tools
Quick picks
| Pick | Best for | What to know |
|---|---|---|
| Samsung Galaxy Watch8 | Best overall Android health-and-fitness smartwatch | Overnight blood-oxygen trends and an FDA-authorized feature that detects signs of moderate-to-severe obstructive sleep apnea. U.S. price starts at $299.99 before trade-in on Samsung’s page. Requires Android; some health functions also require Samsung Health and a Samsung account. Samsung details. |
| Withings ScanWatch 2 | Best hybrid-health option | Traditional watch styling and health-focused reporting rather than a full smartwatch experience. A study of an earlier ScanWatch model reported favorable accuracy results under its test conditions; that does not establish ScanWatch 2 performance in every situation. Withings details. |
| Fitbit Charge 6 | Best slim activity-band candidate | A compact option for everyday activity, workouts, and sleep. Treat its SpO₂ feature as wellness trend information; confirm current app, account, and feature requirements. Google Store details. |
| Garmin vívosmart 5 or a Garmin watch with Pulse Ox | Best for Garmin’s sports ecosystem | Consider Garmin for training and sports metrics, not as a proven SpO₂ accuracy leader. Evidence from one Venu 2S comparison cannot be generalized to all Garmin models. Garmin product information. |
| Fingertip pulse oximeter | Better fit for a home spot measurement | Choose a properly labeled device if you need a direct home measurement rather than passive lifestyle trends. Ask a clinician which device is appropriate for a health condition. |
How to choose an SpO₂ tracker
SpO₂ is an estimate of the percentage of hemoglobin carrying oxygen. A wearable uses light reflected from tissue; it does not analyze a blood sample. Wrist readings can be affected by movement, fit, circulation, temperature, skin pigmentation, and other factors. The FDA cautions that pulse-oximeter readings can be inaccurate in some circumstances and advises people not to rely on the number alone when symptoms are serious or worsening. FDA guidance on pulse oximeters.
#1 Best Overall
- No APP & Phone Required Fitness Tracker Watch: This Fitness Tracker watch doesn't require any App or smartphone connections! It's as simple to use as a regular watch but smarter. Perfect for anyone looking for an easy fitness tracker without the hassle of smartphone setups.
- Heart Rate and Sleep Monitoring: The Fitness Tracker monitors your heart rate automatically all day, and you can select manual mode through the App. The fitness Watch also monitors your sleep at night, providing a detailed analysis of your sleep quality (deep sleep, light sleep, awake time). It is a health advisor for women men in daily life.
- Multi Sport Modes with Activity Tracking: The fitness tracker features 9 sport modes like running, walking and more. Additionally, the activity tracker records daily steps, calories burned, walking distance and active time throughout the day. You can also set a daily steps goals through the App to track your progress.
- Smart Notification Reminder: You can get SMS messages, and SNS notifications directly on your wrist including Facebook, Twitter, Gmail ect. You won't miss any important calls and message and stay updated. Please note: the smart watch can not make calls or text.
- Long Battery Life and IP68 Waterproof: This smart watch only requires 2 hours of charging and can be used for 5-7 days continuously, IP68 waterproof rating can withstand daily sweat, washing hands and rainy day, allowing you to fully enjoy your workouts.
Before buying, check what the device actually does: a manual spot check, an overnight estimate, periodic background sampling, or a derived sleep or respiratory insight are different features. “Has an SpO₂ sensor” does not mean “continuously monitors oxygen,” and it does not guarantee a useful reading during exercise.
- Choose the collection mode you will use. Overnight trends can add context to sleep; a manual reading may be more convenient for occasional checks. Background sampling schedules vary.
- Check compatibility and region. A feature may be limited by country, phone model, operating system, account, or app. Samsung specifies Android 11 or later for pairing requirements and says some health functions need Samsung Health and a Samsung account.
- Match the device to your activity needs. Compare workout modes, GPS (built-in or phone-connected), heart-rate tracking, training metrics, water resistance, and comfort—not just the presence of SpO₂.
- Think about overnight wear and charging. Consistent sleep tracking depends on wearing the device comfortably. Check the manufacturer’s battery-life claim for your intended settings; oxygen sampling and other features can affect actual use.
- Check data access and costs. Confirm whether historical readings and advanced insights are available without a subscription, and whether data can be viewed or shared through the health platforms you use.
- Look for evidence on the exact model. Independent comparison against a reference device is more useful than a broad brand claim. Check the tested model, participants, conditions, and whether testing was at rest or during movement.
Best SpO₂ activity trackers
Samsung Galaxy Watch8: best overall Android smartwatch
Galaxy Watch8 is the best fit if you want a full Android smartwatch alongside overnight oxygen trends, sleep insights, and broad fitness features. Samsung says its sleep-apnea feature is FDA-authorized to detect signs of moderate-to-severe obstructive sleep apnea by examining oxygen-saturation dips overnight. That is a defined risk-detection feature—not a diagnosis of sleep apnea.
Samsung lists a U.S. starting price of $299.99 before trade-in. Compatibility is a meaningful limitation: it must be paired with an Android phone, and some health functions require Samsung Health and a Samsung account. It is a poor fit for iPhone owners, people who want a discreet band, or anyone seeking medical oxygen monitoring. Check Samsung’s current price, requirements, and feature availability.
SpO₂ evidence: A study tested the older Galaxy Watch 5, not Watch8. Its results should not be treated as proof of Watch8 accuracy. The sleep-apnea feature has a separate, specific regulatory status; that status does not make every watch reading a clinical measurement.
Withings ScanWatch 2: best hybrid-health option
ScanWatch 2 is for people who like a conventional watch appearance and health-oriented reporting more than a large touchscreen or full smartwatch app experience. Its design may also suit buyers who want a watch they can wear overnight without the look or feel of a typical sports watch. Check Withings’ live page for current pricing and specific feature availability.
Rank #2
- 【Crystal-Clear Communication】AEAC smartwatch delivers clear call quality with high-definition speakers and microphones. Built with an AI assistant, it enables smooth voice commands and hands-free calls.
- 【Comprehensive Health Monitoring】The AEAC smartwatch tracks vital health metrics—blood oxygen, heart rate, stress, and sleep analysis—providing you with valuable insights for enhanced well-being.
- 【Long-Lasting Battery】Enjoy up to 10 days of use on a quick 2-hour charge. Will monitor your heart rate, steps, activity routes, and calorie burn around the clock, offering a complete view of your health and fitness.
- 【110+ Sports Modes & Waterproof】With 110+ sports modes, this fitness watch supports a wide range of activities, from yoga to swimming. Its 3ATM water-resistant design ensures reliable performance in wet conditions.
- 【1.32" AMOLED Touchscreen】 Features a 1.32-inch AMOLED display for sharp visuals and smooth responsiveness. The watch face measures 43 mm, offering a clear and comfortable viewing area. Choose from 200+ watch faces or personalize with your own photos, making the watch uniquely yours
Withings ScanWatch was included in an independent comparison of consumer watches against a reference oximeter. The tested ScanWatch met the study’s ISO accuracy criterion, and it was among the models that met the study’s more stringent FDA-related criterion. The study was not a blanket test of every ScanWatch generation or condition, so it is evidence about that comparison—not a guarantee for ScanWatch 2 or every wearer. Read the comparison and check Withings’ product details.
Trade-off: This is less suited to buyers seeking rich on-watch workout interaction or a full smartwatch replacement. Consider it for a hybrid design and health reporting, not as a medical monitor.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteFitbit Charge 6: best slim activity-band candidate
Charge 6 is a sensible direction for someone who prioritizes a small everyday tracker for steps, workouts, and sleep over a large watch display. Its SpO₂ data should be understood as a wellness trend feature; do not assume that it provides continuous monitoring or dependable real-time exercise oxygen measurements.
Fitbit’s product pages now sit within Google’s store ecosystem, so verify current pricing, app and account requirements, feature availability, and any subscription-dependent insights before buying. Check the current Google Store listing. It is a weaker fit if you want advanced navigation, a big screen, or medical-grade oxygen readings.
Garmin vívosmart 5 or a Garmin watch with Pulse Ox: best for Garmin sports users
Garmin makes most sense when its training tools, sports metrics, and fitness ecosystem are the priority. Check the specific model’s product information for whether Pulse Ox is available and how readings are collected; do not assume every model samples in the same way or offers exercise readings.
Rank #3
- 【Crystal-Clear Bluetooth Calls & Message Notification】 AEAC smart watch with Bluetooth 5.3 and a built-in DSP chip, enjoy ultra-clear call quality and zero lag. Stay connected on the go with real-time SMS and app notifications (Not supporting reply messages)—all from your wrist.
- 【1.85" HD Display with 60Hz Refresh Rate】Experience crisp visuals and smooth scrolling on the vibrant 1.85" HD touchscreen. Plus, you can also upload photos of your family, pets, and scenery to customize a watch face with your own style.
- 【24/7 Health Monitoring】Track your health around the clock with advanced sensors. Monitor heart rate, sleep stages, stress levels, and more, helping you make informed choices for a healthier lifestyle.
- 【Fitness Tracking with 100+ Modes】Elevate your workouts with over 100 sport modes, including running, swimming, yoga, and more. The IP68 waterproof design ensures it’s ready for your toughest adventures, from the gym to the pool.
- 【Seamless Compatibility & Long Battery Life】AEAC smart watch works effortlessly with iOS and Android smartphones. Enjoy up to 7 days of battery life on a single charge, so you never have to worry about recharging.
One independent comparison found substantially larger SpO₂ error for the Garmin Venu 2S than for the Apple Watch Series 7 tested. That finding is limited to those devices and that study; it is not a fair basis for declaring all current Garmin watches inaccurate. It is, however, a reason not to buy a Garmin primarily on an unsubstantiated claim of class-leading SpO₂ accuracy. Read the study or check Garmin’s current product information.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →What independent accuracy studies can—and cannot—tell you
In a comparison of Apple Watch Series 8, Samsung Galaxy Watch 5, and Withings ScanWatch against a reference oximeter, all three met the ISO 80601-2-61 accuracy requirements in that study. Only Apple Watch Series 8 and Withings ScanWatch met the study’s more stringent FDA-related criterion. These results are useful comparisons of the tested models and conditions; they do not make any of the watches a substitute for medical monitoring or establish that newer models perform identically. Study details.
A separate comparison found the tested Apple Watch Series 7 closest to a clinical-grade reference and Garmin Venu 2S farthest away among the devices studied. Again, this is a result about those models and that protocol—not a brand-wide ranking. A 2025 living review reported that blood-oxygen measurement had been validated in Apple Watch Series 6 through Series 8 across the studies it reviewed, while noting the need for continued longitudinal validation. Garmin and Apple comparison · 2025 Apple Watch review.
Accuracy findings are strongest when a study tests the exact product against a reference device, includes a relevant range of participants and skin tones, reports error metrics, and reflects the conditions in which you plan to use it. Resting, overnight, and exercise readings are not interchangeable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is SpO₂ useful for fitness?
It can add context to personal trends—for example, when comparing overnight readings under similar conditions or observing how your device behaves during a trip to altitude. It is not a direct measure of aerobic fitness. For training decisions, pace, heart rate, performance over time, training load, and VO₂ max estimates are generally more relevant.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Rank #4
- 【Superb Visual Experience & Effortless Operation】Diving into the latest 1.58'' ultra high resolution display technology, every interaction on the fitness watch is a visual delight with vibrant colors and crisp clarity. Its always on display clock makes the time conveniently visible. Experience convenience like never before with the intuitive full touch controls and the side button, switch between apps, and customize settings with seamless precision.
- 【Comprehensive 24/7 Health Monitoring】The fitness watches for women and men packs 24/7 heart rate, 24/7 blood pressure and blood oxygen monitors. You could check those real-time health metrics anytime, anywhere on your wrist and view the data record in the App. The heart rate monitor watch also tracks different sleep stages for light and deep sleep,and the time when you wake up, helps you to get a better understanding of your sleep quality.
- 【120+ exercise modes & All-Day Activity Tracking】There are more than 120 exercise modes available in the activity trackers and smartwatches, covering almost all daily sports activities you can imagine, gives you new ways to train and advanced metrics for more information about your workout performance. The all-day activity tracking feature monitors your steps, distance, and calories burned all the day, so you can see how much progress you've made towards your fitness goals.
- 【Messages & Incoming Calls Notification】With this smart watch fitness trackers for iPhone and android phones, you can receive notifications for incoming calls and read messages directly from your wrist without taking out your phone. Never miss a beat, stay in touch with loved ones, and stay informed of important updates wherever you are.
- 【Essential Assistant for Daily Life】The fitness watches for women and men provide you with more features including drinking water and sedentary reminder, women's menstrual period reminder, breath training, real-time weather display, remote camera shooting, music control,timer, stopwatch, finding phone, alarm clock, making it a considerate life assistant. With the GPS connectivity, you could get a map of your workout route in the app for outdoor activity by connecting to your phone GPS.
Movement can make wrist readings less dependable, so do not assume a device’s overnight or resting feature is a meaningful live workout metric. Avoid comparing one tracker’s exercise reading with another tracker’s resting reading: sampling windows and conditions differ, and motion adds error.
How to get a more consistent reading
- Wear the tracker snugly, without making it uncomfortably tight, and position it as the manufacturer instructs.
- Keep the arm and wrist still; do not take a reading immediately after vigorous movement.
- Warm cold hands or extremities and make sure the sensor has good contact with skin.
- Remove anything that interferes with sensor contact, and follow the maker’s instructions for the feature.
- Repeat an unexpected result and compare readings under similar conditions rather than over-interpreting one value.
- If you need a home spot measurement, consider a fingertip pulse oximeter with clear labeling and appropriate regulatory status.
These precautions may help produce more consistent measurements; they do not guarantee accuracy. Factors identified by the FDA include skin pigmentation, poor circulation, skin thickness, skin temperature, tobacco use, and fingernail polish. Do not assume a particular smartwatch is equally accurate across all skin tones without adequate product-specific evidence. FDA information.
When to use a fingertip pulse oximeter—or seek care
A wrist tracker is designed for convenient lifestyle trends. A fingertip pulse oximeter is a better fit when you need a direct home spot measurement, though it too can be affected by device quality and measurement conditions. For children, pregnancy, lung disease, or another chronic condition, ask a healthcare professional what monitoring—if any—is appropriate rather than using a consumer watch to guide care.
If a wearable reading is unexpectedly low, stop activity, rest, warm the wrist or hand, reposition the device, and repeat the measurement. If available and appropriate, compare with a fingertip device. Consider how you feel as well as the number. Contact a healthcare professional if a result remains concerning; seek care when symptoms are serious or worsening. The FDA advises against relying on a pulse-oximeter number alone in those circumstances.
If readings disappear or vary widely, check that the feature is enabled, the device was worn correctly and for the relevant period, and the required phone, account, app, and region settings are in place. Battery-saving settings, loose fit, movement, cold skin, different sampling windows, or comparing a spot reading with a nightly average can also explain gaps or differences.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
