Affiliate Disclosure: This post may contain affiliate links. If you buy through one of them, we may earn a commission at no extra cost to you. Our picks are based on manufacturer information, FDA records and published reviews. Read our full Affiliate Disclosure for details.
The best smartwatch for sleep apnea detection is one with an FDA-cleared feature built specifically to flag it, not just a general sleep tracker. Only two brands currently offer that: Samsung and Apple. Both use different sensors and different rules for who should use them, so the right pick depends on your phone and your situation.
Sleep apnea is common and often undiagnosed. It causes repeated breathing interruptions during sleep and is linked to fatigue, high blood pressure and a higher risk of heart problems over time. Here is how the two cleared options work, and what to expect.
Quick Answer
- Best for Samsung phone owners: Samsung Galaxy Watch, which was the first FDA-authorized sleep apnea feature on a smartwatch.
- Best for iPhone owners: Apple Watch (Series 9, 10 or Ultra 2), with its Breathing Disturbances notification feature.
- Everyone else: Other brands, including Fitbit and Garmin, offer general sleep and breathing metrics but no FDA-cleared sleep apnea detection.
How Smartwatch Sleep Apnea Detection Works
Both cleared features are screening tools, not diagnostic tests. They look for patterns during sleep and tell you when those patterns are worth checking out with a doctor.
- Samsung Galaxy Watch: Uses the BioActive Sensor to track blood oxygen levels to estimate an Apnea-Hypopnea Index (AHI), a standard measure of how often breathing stops or slows during sleep.
- Apple Watch: Uses the accelerometer to track tiny wrist movements linked to breathing, a metric Apple calls «breathing disturbances,» and notifies you if a month of data shows a consistent pattern.
The Best Smartwatches for Sleep Apnea Detection at a Glance
| Watch | How it detects apnea | FDA status | Who it’s for |
|---|---|---|---|
| Samsung Galaxy Watch (Watch4 and later) | Blood oxygen-based AHI estimate over 2 nights | FDA De Novo authorized, first of its kind | Adults 22+, not previously diagnosed |
| Apple Watch Series 9, 10, Ultra 2 | Accelerometer-based breathing disturbances over 30 days | FDA-cleared, September 2024 | Adults 18+, not previously diagnosed |
| Other brands (Fitbit, Garmin, etc.) | General sleep and SpO2 tracking | Not cleared for sleep apnea detection | General wellness tracking only |
1. Samsung Galaxy Watch: Best for Samsung Phone Owners
Samsung’s Sleep Apnea feature was the first smartwatch-based tool to receive FDA De Novo authorization, meaning the FDA created a new category for it rather than comparing it to an existing cleared device. To use it, you track sleep for more than four hours on two nights within a 10-day period, and the app estimates your AHI. Samsung is clear that it is intended for adults 22 and older who have not already been diagnosed with sleep apnea, and it is not a substitute for a clinical sleep study.
Trade-offs: Requires a compatible Samsung Galaxy phone and watch. It only reports on the nights you actively track, rather than every night automatically. Our best smartwatch for heart health guide covers Samsung’s other cleared features.
2. Apple Watch: Best for iPhone Owners
Apple’s Sleep Apnea Notifications feature works passively once you turn it on. Wearing the watch to bed, the accelerometer looks for breathing disturbances each night, classifying them as elevated or not elevated. Over a 30-day window, if the pattern is consistent with moderate to severe sleep apnea, you get a notification along with three months of history to bring to a doctor. Apple developed the algorithm using a large dataset of clinical-grade sleep tests and validated it in a clinical study before the FDA cleared it in September 2024.
Trade-offs: You need to wear the watch to bed every night for the 30-day window to build toward a result. It is intended for adults 18 and older without a prior sleep apnea diagnosis. See our best smartwatch for AFib detection guide for more on Apple’s other background health notifications.
3. Other Brands: General Sleep Tracking Only
Fitbit, Garmin and most other wearables track sleep stages, heart rate and sometimes blood oxygen overnight. That data can hint at disrupted sleep, but none of these brands currently has an FDA-cleared feature that screens specifically for sleep apnea. If your watch shows unusually low overnight SpO2 or fragmented sleep night after night, it is still worth mentioning to a doctor, even without a dedicated apnea notification.
What These Features Cannot Do
- They cannot diagnose sleep apnea. Both Samsung’s and Apple’s features are explicitly not intended to diagnose or manage the condition.
- They cannot replace a sleep study. An in-lab polysomnography or a prescribed home sleep apnea test remains the standard for diagnosis.
- They are not for people already diagnosed. Both features are designed to screen undiagnosed users, not to monitor treatment.
- They can miss cases. Not everyone with sleep apnea will get a notification, and results depend on wearing the watch consistently and correctly.
What to Do If You Get an Alert
- Do not panic. A notification means a pattern was seen, not a diagnosis.
- Save your watch’s report or export the data if possible.
- Book an appointment with a doctor or sleep specialist and bring the data.
- Ask about a formal sleep study if your doctor recommends one.
Which Should You Choose?
Choose Samsung Galaxy Watch if you:
- Use a Samsung Galaxy phone
- Want a specific AHI-based estimate
Choose Apple Watch if you:
- Use an iPhone
- Prefer passive, automatic tracking over active monitoring nights
If your main concern is heart rhythm rather than breathing, see our guide to the best smartwatch for AFib detection.
Frequently Asked Questions
Which smartwatch can detect sleep apnea?
Only the Samsung Galaxy Watch and the Apple Watch (Series 9, 10, and Ultra 2) currently have FDA-cleared features built specifically to screen for sleep apnea.
Can Fitbit or Garmin detect sleep apnea?
Not with an FDA-cleared feature. They track general sleep and breathing metrics, which can be useful context but are not a screening tool for the condition.
Do I need a diagnosis already to use these features?
No. Both Samsung’s and Apple’s features are meant for people who have not been previously diagnosed with sleep apnea.
How long does it take to get a result?
Samsung’s feature needs two nights of over four hours of sleep within 10 days. Apple’s feature evaluates data over a rolling 30-day period.
Is a smartwatch as accurate as a sleep study?
No. Both features are screening tools designed to flag a pattern worth investigating, not to replace a clinical sleep study.
The Bottom Line
The best smartwatch for sleep apnea detection is whichever cleared feature matches your phone: Samsung Galaxy Watch for Android and Samsung users, or Apple Watch for iPhone owners. Both are screening tools, not diagnoses, so treat any alert as a reason to talk with a doctor about further testing.
Last reviewed: September 2026.
This article was researched and written by our editorial team using the sources below, following the process described on our About Us page. It is not written or reviewed by a medical professional.
Sources
- Samsung Newsroom — Samsung sleep apnea feature study, World Sleep Day 2026
- American Academy of Sleep Medicine — Samsung Galaxy Watch sleep apnea feature receives FDA authorization
- Apple Support — About Sleep Apnea Notifications on Apple Watch
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Smartwatch sleep apnea features are screening tools and are not intended to diagnose, treat or manage sleep apnea or any other condition. They are not a substitute for a clinical sleep study or professional care. Features, regulatory status and prices change over time, so verify details with the manufacturers. Always consult your healthcare provider about sleep concerns.