Smartwatch

SamsungGalaxy Watch9

Name: Samsung Galaxy Watch9
Brand: Samsung
Price: 429.99 USD

Android smartwatch with an FDA-authorized sleep apnea alert and ECG app

By Porsche Ma Facts checked Oct 13, 2026

Source-based analysis, not hands-on testing. Our method

Cofounder of Superhuman Chambers · About the author. General information, not medical advice. No independent clinical review is claimed.

The verdict

Galaxy Watch9 is Samsung's smartwatch for Android phones, with an FDA-authorized sleep apnea alert and an ECG app. Samsung's buy page lists the 40mm at $429.99, and there's no listed fee for the health features. The catch is battery life: Samsung rates it at up to 30 hours with the always-on display on.

The trade-off

Expect to charge it about once a day, and blood pressure estimates need a separate cuff for calibration every 28 days.

Samsung Galaxy Watch9, manufacturer product image — Photo: Samsung.Source ↗

Model reviewed: 40mm, Bluetooth (no LTE), Graphite

$429.99

US price, checked Oct 13, 2026

Check price at Samsung

No affiliate commission on this link. Check the exact variant before buying.

About this price

Samsung's buy page listed the 40mm at $429.99 and the 44mm at $459.99, with no sale or 'was' wording. The page title names the Bluetooth model, but the text doesn't label the connection and shows Verizon, AT&T and T-Mobile logos. The Galaxy Watch9 page says 'From $379.99 or $15.83/mo before trade-in'. Samsung's July 22 launch release put the Bluetooth model from $379.99 and LTE from $429.99. So $429.99 may be the 40mm LTE price, and the 40mm Bluetooth model may cost $379.99. Confirm the price at checkout. Prices are before tax and shipping, with no trade-in credit or financing deducted.

A GOOD FIT FOR

You have an Android phone on Android 13 or later and want a sleep apnea alert and an ECG app without a listed monthly fee.

You have an Android phone on Android 13 or later and want a smartwatch with a sleep apnea alert
You're 22 or older, not pregnant and not diagnosed with sleep apnea, and want an alert about possible risk
You're 22 or older and want an ECG app on your wrist
You want sleep and heart features without a listed monthly fee

THINK TWICE IF

iPhone owners: Samsung lists its sleep apnea and bedtime features for Android 13 or later, and the page doesn't mention iPhone
Anyone under 22, pregnant or already diagnosed with sleep apnea, since Samsung says the sleep apnea feature isn't for them
Anyone under 22 or with a known arrhythmia other than AFib, for whom Samsung says the ECG app isn't intended
Anyone who wants blood pressure estimates without buying a cuff, since calibration needs one every 28 days
Anyone who wants several days per charge: Samsung rates it at up to 30 hours with the always-on display on

What still needs checking

Whether the buy page's $429.99 for the 40mm is the Bluetooth or the LTE price
Battery life with the always-on display off, and which size the 30-hour figure is for
The standard warranty length for a watch bought in the US
What's in the box, including whether a charger or power adapter comes with it
Band material, and whether the listed weight includes the band
Which version of the sleep apnea feature Galaxy Watch9 runs, since the FDA documents don't name it
Whether the ECG app and blood pressure feature on Galaxy Watch9 carry their own FDA status
The full list of sensors behind the BioActive sensor
Whether the watch works with an iPhone at all
The price of a compatible blood pressure cuff
Independent, peer-reviewed accuracy data for Galaxy Watch9

The practical details.

Specifications for Samsung Galaxy Watch9
Exact variant	40mm, Bluetooth (no LTE), Graphite
Battery	390 mAh for the 40 mm model and 445 mAh for the 44 mm. Samsung's launch release rates it at up to 30 hours with the always-on display on, without naming a size. The 40 mm charges to 50% in 30 minutes and to 100% in 80 minutes
Sensors	Samsung names a BioActive sensor for health tracking. The page doesn't list the individual sensors
Health features	Sleep apnea risk notification and an ECG app, both for people 22 and older. Also blood pressure estimates, Bedtime Guidance, Energy Score, Vitals, Heart Health Score, an antioxidant index and an AGEs index. Blood pressure needs calibration every 28 days with a third-party cuff, sold separately. Samsung says Bedtime Guidance and Vitals are for wellness only
Subscription	None listed for the health features. Optional iFIT premium content needs a paid subscription. The iFIT offer gives up to 2 months, then renews at iFIT's monthly rate unless you cancel. The Strava offer gives a 60-day trial that becomes a paid annual plan unless you cancel
Compatibility	Runs Google Wear OS. Samsung lists sleep apnea, Bedtime Guidance and Energy Score for Android phones on Android 13 or above. A blood pressure footnote says Android 12 or later and Wear OS 4.0. The page doesn't mention iPhone
Water resistance	5ATM, IP68 and MIL-STD-810H, according to Samsung's launch release. The Galaxy Watch9 page's IP68 footnote says it's water-resistant in up to 5 feet of water for up to 30 minutes. It says to rinse and dry the watch after it gets wet
Display	Sapphire crystal, with brightness up to 3,000 nits. The 40 mm screen is 1.34 inches (438 x 438), and the 44 mm is 1.47 inches (480 x 480)
Sleep apnea FDA status	De Novo DEN230041, granted February 6, 2024, for adults 22 and older. Version 2.0 got 510(k) clearance K261011 on July 20, 2026, for users 18 and older. Neither FDA document names Galaxy Watch9
Dimensions	Samsung's launch release lists the 40 mm at 42.7 x 40.4 x 8.6 mm and 31.5 g. The 44 mm is 46.0 x 43.7 x 8.6 mm and 34.0 g. The 40 mm comes in Cream or Graphite, and the 44 mm in Silver or Graphite. The Galaxy Watch9 page lists a 14 g band.
Materials	Samsung says the case is aluminum and the display is sapphire crystal. It doesn't say what the band is made of.

Before you buy

InstallationNo installation

No installation. It runs Google Wear OS. Samsung lists sleep apnea, Bedtime Guidance and Energy Score as available on Android phones running Android 13 or above. The Galaxy Watch9 page doesn't mention iPhone. Neither that page, the buy page nor the launch release lists what's in the box, so it's unclear whether a charger or power adapter comes with it.

WarrantySamsung's US warranty page gives no length for a watch bought in the US

Samsung's US warranty page gives no length for a watch bought in the US. Its only figure is a 'standard warranty 12-month period' in an FAQ on international service, which names watches launched in 2023 or later. The Standard Limited Warranty that Samsung links for this model doesn't state the period either. It covers the battery only if capacity falls below 80% of its rating.

ReturnsWatches bought on Samsung.com or the Shop Samsung app can be returned within 15 days…

Watches bought on Samsung.com or the Shop Samsung app can be returned within 15 days of delivery. Samsung charges a 5% restocking fee unless the return is for damage or a defect. Damage or defect claims are due within 5 days of delivery. Return shipping is free. The watch must be like new, factory reset and in its original packaging with everything that came in the box. Watches bought elsewhere follow that retailer's policy.

More about this assessment

Galaxy Watch9 is Samsung's Wear OS smartwatch for Android phones, with a sleep apnea alert and an ECG app. The buy page lists the 40mm at $429.99 without naming the connection, while the main page says 'From $379.99'. The FDA granted the sleep apnea feature a De Novo authorization in February 2024 for adults 22 and older. There's no listed fee for the health features, but blood pressure estimates need a separate cuff for calibration every 28 days. The catch is battery life: Samsung rates it at up to 30 hours with the always-on display on. Samsung.com returns close 15 days after delivery, with a 5% restocking fee.

Strengths on paper

No fee listed for the sleep, heart or blood pressure features
A sleep apnea alert with FDA De Novo authorization, for adults 22 and older
ECG app, blood pressure estimates, Bedtime Guidance, Energy Score and Vitals on one watch
Sapphire crystal display with brightness up to 3,000 nits
Samsung lists it at 8.6 mm thick, down from 9.7 mm for Galaxy Watch7
The 40 mm weighs 31.5 g and has an aluminum case
The 40 mm charges to 50% in 30 minutes, according to Samsung

Limitations

Samsung rates the battery at up to 30 hours with the always-on display on
Blood pressure needs calibration with a separate cuff every 28 days, and Samsung says it isn't for diagnosing disease
Sleep apnea, Bedtime Guidance and Energy Score need an Android phone on Android 13 or later
The sleep apnea alert is only for people 22 or older who aren't pregnant and haven't been diagnosed
Samsung says Bedtime Guidance and Vitals are for wellness only, and Heart Health Score isn't for diagnosing disease
The buy page lists the 40mm at $429.99 but doesn't say whether that's Bluetooth or LTE
Returns close 15 days after delivery, with a 5% restocking fee unless the watch is damaged or defective
Samsung doesn't state a US warranty length outright or list what's in the box

What it costs to own.

Adjust the assumptions for your use. Missing costs stay unknown.

PLAN YOUR OWNERSHIP COSTS

What will it cost to own?

Change the assumptions to fit your use. Leave an unknown cost blank. Add water, subscriptions, cleaning, shipping and taxes if they apply. Use average operating power, not the maximum rating.

Purchase price ($)Installation / accessories ($)Annual consumables ($)Average operating power (W)Hours per dayAnnual other costs ($)Electricity ($/kWh)Years

3-year known subtotal

$429.99

Incomplete: energy use. This is not the full ownership cost.

Energy component: Unknown

Purchase + installation + years × (annual consumables + annual other) + watts/1000 × hours/day × 365 × years × $/kWh. Annualized allowances, not an exact replacement schedule. Excludes taxes, shipping, finance and resale unless entered.

Replacement parts & cost assumptions

No scheduled consumable is listed. That does not mean zero maintenance or repair costs.

The estimate uses $429.99, the 40mm price on Samsung's buy page, before tax. The buy page doesn't label Bluetooth or LTE, and Samsung's main page says 'From $379.99', so the Bluetooth model may cost $50 less. With no listed fee or part, the three-year estimate is $429.99 plus charging energy, which is unknown.
Other annual costs are $0 because the page lists no fee for the sleep apnea, ECG, blood pressure or sleep features. Optional iFIT premium content needs a paid subscription. The iFIT and Strava trial offers both turn into paid plans unless you cancel. Neither is included.
Blood pressure estimates need calibration every 28 days with a third-party cuff, sold separately. Samsung doesn't price the cuff, so it isn't in the estimate.
Annual consumables are $0 because Samsung lists no replaceable parts. That doesn't mean battery wear, replacement bands, repairs or Samsung Care+ cost nothing. Samsung's warranty covers the battery only if capacity falls below 80% of its rating. Samsung doesn't state the charger's power draw, so energy is unknown.
The estimate leaves out the up to $250 instant trade-in credit and financing. The Galaxy Watch9 page also mentions a $50 Samsung credit without trade-in, but its footnote dates that offer August 7 to September 27, 2026.

Evidence & sources.

How accurate are sleep trackers? Our evidence review grades the research as Moderate. That grade is about the claim, not about this product.

Manufacturer claimSamsung calls its sleep apnea risk detection FDA-cleared and says the U.S. FDA regulates the Samsung Sleep Apnea Feature as a medical device. Samsung says Galaxy Watch9 'detects signs of moderate to severe obstructive sleep apnea risk'. The feature is for people 22 and older who haven't been diagnosed with sleep apnea. Samsung says not to use it if you're pregnant.^{1, 3} This is Samsung's own description. The page lists the feature for Android 13 or above and says it needs at least 2 days of sleep data within 10 days. Samsung's launch release says the feature is 'backed by new FDA clearance'.
Regulator recordThe FDA granted Samsung's Sleep Apnea Feature a De Novo (DEN230041) on February 6, 2024, as a Class II over-the-counter device to assess sleep apnea risk. It's for adults 22 and older without a sleep apnea diagnosis, over two nights. In the FDA's review, it flagged 82.7% of people with moderate to severe obstructive sleep apnea (167 of 202). It correctly cleared 87.7% of people without it (235 of 268).^{7, 8} The reference was polysomnography (PSG), with moderate to severe apnea defined as an AHI above 15. The specificity result didn't pass the study's acceptance criteria. A modified calculation raised it to 91.1%. Of 620 people enrolled, 47 didn't complete the study. The decision summary doesn't name Galaxy Watch9, which came out later.
Regulator recordOn July 20, 2026, the FDA cleared Sleep Apnea Feature v2.0 through 510(k) K261011, with the De Novo feature as its predicate. It's for users 18 and older and needs two nights of valid data within 10 days. In a study of 475 people wearing the watch, it flagged 90.8% of those with moderate to severe sleep apnea. It correctly cleared 90.3% of those without it.^{9, 10} The 510(k) summary doesn't name Galaxy Watch9. Samsung's Galaxy Watch9 page still limits the feature to ages 22 and older, which matches the original De Novo. Samsung doesn't say which version Galaxy Watch9 runs.
Manufacturer claimSamsung says the ECG app is for adults 22 and older and isn't for people with known arrhythmias other than AFib. It says the blood pressure function isn't intended to diagnose disease or other conditions. Blood pressure needs calibration every 28 days with a third-party cuff, sold separately.¹ The page doesn't give an FDA status for the ECG app or the blood pressure feature on Galaxy Watch9.
Manufacturer claimSamsung says Bedtime Guidance is for general wellness and fitness only, and that Vitals is for wellness only, not for diagnosing any medical condition. It says Heart Health Score isn't intended to diagnose disease, and the AGEs index is for personal reference only. Vitals needs at least 7 nights of sleep data.¹ Samsung gives no FDA status for these features. No independent Galaxy Watch9 accuracy study was reviewed.