Apple Watch Ultra 3

Name: Apple Watch Ultra 3
Brand: Apple
SKU: 5548

Manufacturer: Apple

The Apple Watch Ultra 3 is a rugged, feature-rich smartwatch built for demanding use cases, from open-water swimming to high-altitude adventures. It runs on a sapphire glass-protected 1.98″ OLED display with always-on functionality and a pixel density of 326 ppi, housed in a 49 mm case weighing 61.8 g. The watch is rated to 100 m waterproof depth and includes dedicated diving support, making it one of the few smartwatches designed explicitly for underwater activity.

On the health and sensor side, the Apple Watch Ultra 3 covers an extensive range of monitoring tools, including ECG, blood oxygen tracking, HRV measurement, VO2 max estimation, body temperature sensing, and irregular heart rate warnings. It connects via Bluetooth 5.3, Wi-Fi 4, NFC, and an integrated eSIM for standalone cellular use. Battery life reaches up to 72 hours in power-save mode, with a standard charge time of 1.5 hours via wireless charging. Internal storage sits at 64 GB with 2 GB of RAM, and the device supports voice commands, fall detection, crash detection, and multi-sport tracking modes.

Pros

Waterproof to 100 m with a 10 ATM rating, making it suitable for diving and serious water activities
Sapphire glass display offers strong resistance to scratches without relying on a branded coating
Built-in cellular with eSIM support allows the watch to function independently without a paired phone
Extensive health monitoring includes ECG, HRV tracking, VO2 max, blood oxygen, and irregular heart rate warnings
72-hour battery life in power-save mode provides meaningful endurance for extended outdoor use
64 GB of internal storage is generous for a smartwatch, accommodating offline music and data

Cons

Standard battery life of only 1.75 days requires frequent charging under normal use
Not compatible with Android devices, limiting it to iOS users only
Weighing 61.8 g with a 49 mm case, the physical size and weight may feel bulky on smaller wrists
No cadence sensor, which may be a limitation for cyclists who rely on that metric
Does not support ANT+, restricting compatibility with certain third-party fitness accessories
Lacks a smart alarm feature, which some users may expect at this level of functionality

Who is this for?

The Apple Watch Ultra 3 is well-suited to athletes, outdoor enthusiasts, and active individuals who need a watch that can keep up with demanding physical environments. Its 100 m waterproof rating and dedicated diving support make it a practical choice for swimmers, divers, and water sports participants, while the multi-sport mode, elevation tracking, route mapping, and fast GPS lock cater to trail runners, hikers, and endurance athletes. Users who prioritize detailed health oversight will also find value here, as the combination of ECG, HRV tracking, VO2 max, blood oxygen monitoring, and fall and crash detection provides a thorough picture of both fitness and safety. The 72-hour battery life in power-save mode further supports those going on extended expeditions where charging is not always possible, and the 64 GB of internal storage means offline music and workout data can be stored in quantity.

Who is this NOT for?

Users who prefer a lightweight, low-profile watch may struggle with the Apple Watch Ultra 3, as its 49 mm case and 61.8 g weight make for a physically large and noticeable wrist presence that can feel cumbersome during everyday wear or for those with smaller wrists. Android users are entirely excluded, as the watch is only compatible with iOS, making it unsuitable for anyone outside the Apple ecosystem. Those who rely on ANT+ accessories or a cadence sensor for cycling-focused training will find the missing support a meaningful gap, and users who prefer guided coaching through their wearable will find no such feature available here. The standard battery life of just 1.75 days also means this is not an ideal fit for users who prefer to charge infrequently under normal, everyday usage conditions.

Design:

screen size	1.98"
Display type	OLED/AMOLED
water resistance	Waterproof
ATM rating	10 ATM
Ingress Protection (IP) rating	IPX6
waterproof depth rating	100 m
Always-On Display	✓
pixel density	326 ppi
resolution	422 x 514 px
Watch band is replaceable	✓
has branded damage-resistant glass	✕
thickness	12 mm
weight	61.8 g
height	49 mm
width	44 mm
maximum operating temperature	55 °C
lowest potential operating temperature	-20 °C
Has a display	✓
has a touch screen	✓
Has sapphire glass display	✓
volume	25.872 cm³
is designed for kids	✕

The Apple Watch Ultra 3 features a 1.98″ OLED/AMOLED touchscreen with a resolution of 422 x 514 px and a pixel density of 326 ppi, and the always-on display keeps information visible at all times. The case measures 49 mm in height, 44 mm in width, and 12 mm in thickness, with a total volume of 25.872 cm³ and a weight of 61.8 g. Protecting the screen is sapphire glass, though no additional branded damage-resistant glass coating is applied. Water resistance is rated at 10 ATM with an IPX6 ingress protection rating and a waterproof depth of 100 m, making it suitable for submersion in water. The watch band is replaceable, and the device operates within a temperature range of -20 °C to 55 °C. It is not designed for children.

Sensors:

Monitors blood oxygenation levels	✓
Has a heart rate monitor	✓
has GPS	✓
has an accelerometer	✓
Has a temperature sensor	✓
has a compass	✓
Has a barometer	✓
has a gyroscope	✓
Has a cadence sensor	✕
Monitors perspiration	✕

The Apple Watch Ultra 3 is equipped with a comprehensive sensor suite that includes a heart rate monitor, a pulse oximeter for blood oxygenation tracking, a body temperature sensor, and a gyroscope alongside an accelerometer for motion detection. Built-in GPS enables location tracking, while a compass and barometer add directional and altitude awareness. The watch does not include a cadence sensor or a perspiration monitor.

Activity tracking:

Tracks your sleep	✓
Tracks distance	✓
Tracks steps taken	✓
Measures pace	✓
Provides sleep reports	✓
Detects activities automatically	✓
Has a route tracker	✓
Tracks elevation	✓
Has multi-sport mode	✓
Has exercise tagging	✓
Has a stroke counter for swimming	✓
Tracks calorie intake	✕
Designed for diving	✓
Designed for golf	✕

The Apple Watch Ultra 3 covers a wide range of activity tracking capabilities, including steps, distance, pace, elevation, and route tracking, along with automatic activity detection and exercise tagging. Sleep tracking is supported with detailed sleep reports provided through the companion app. The watch features multi-sport mode and is specifically designed for diving, offering a swim stroke counter for water-based activities. It does not support golf-specific tracking or calorie intake logging.

Connectivity:

has a cellular module	✓
Is compatible with iOS	✓
Is compatible with Android	✕
Bluetooth version	5.3
supports Wi-Fi	✓
Wi-Fi version	Wi-Fi 4 (802.11n)
supports ANT+	✕
SIM cards	1 eSIM
has NFC	✓
supports Galileo	✓

The Apple Watch Ultra 3 includes a cellular module with a single eSIM, allowing it to operate independently of a paired phone, and is compatible with iOS but not with Android devices. Wireless connectivity is handled through Bluetooth 5.3 and Wi-Fi 4 (802.11n), while NFC support enables contactless interactions. The watch also supports the Galileo satellite navigation system for positioning, but does not support ANT+.

Battery:

battery life	1.75 days
charge time	1.5 hours
battery life in power save mode	72 hours
has wireless charging	✓
has a rechargeable battery	✓
Has a solar power battery	✕
has a removable battery	✕

The Apple Watch Ultra 3 houses a rechargeable, non-removable battery with a standard battery life of 1.75 days and an extended 72-hour battery life in power-save mode. Charging is handled wirelessly, with a full charge time of 1.5 hours. The watch does not include a solar charging option.

Features:

has HRV tracking	✓
measures VO2 max	✓
measures resting heart rate	✓
has fast/slow heart rate notifications	✓
Can be used to answer calls	✓
Locates your phone	✓
Has call control	✓
Has notifications	✓
has irregular heart rate warnings	✓
Has ECG technology	✓
Has silent alarm	✓
Has vibrating alerts	✓
has fall detection	✓
Has a stopwatch	✓
Has smart alarm	✕
has voice commands	✓
RAM	2GB
internal storage	64GB
Has a built-in camera remote control function	✓
Acquires GPS faster	✓
warranty period	1 years
number of microphones	1
has a front camera	✕

The Apple Watch Ultra 3 offers an extensive set of health and safety features, including ECG technology, HRV tracking, VO2 max measurement, resting heart rate monitoring, and fast/slow heart rate notifications alongside irregular heart rate warnings. Fall detection, vibrating alerts, a silent alarm, and wrist notifications round out the safety and alert capabilities, while voice commands add hands-free convenience. For communication, the watch can answer calls, provides call control, locates a paired phone, and features a single built-in microphone; it does not have a front camera or a smart alarm. Hardware-wise, it comes with 2 GB of RAM and 64 GB of internal storage, supports fast GPS lock, and includes a built-in camera remote shutter control. The device carries a one-year warranty.

App & Software:

Provides activity reports	✓
Has inactivity alerts	✓
Counts how many calories you've burned	✓
Has goal setting	✓
Has achievements	✓
Free app	✓
Has exercise diary	✓
Ad-free	✓
Has coaching	✕
Has temperature tracking	✓
Has period notifications	✓
Supports routes	✓
Has voice feedback	✓
Has music playback	✓
Exports to email	✕
Displays fertile window notifications	✓
Includes maps	✓
Predicts ovulation	✓
Predicts start date	✓
Can be personalised	✓
Has barcode scanner on app	✕
Tracks water intake	✓
Has weight tracking	✓

The companion app for the Apple Watch Ultra 3 is free and ad-free, with support for personalisation to suit individual preferences. It provides activity reports, calorie burn tracking, an exercise diary, goal setting, inactivity alerts, and achievements to support daily fitness habits, along with water intake and weight tracking for broader health monitoring. Reproductive health features include period notifications, fertile window notifications, ovulation prediction, and start date prediction. The app also handles temperature tracking, route support with maps, voice feedback, and music playback during workouts. It does not offer coaching, email export, or a barcode scanner.

Miscellaneous:

has a battery level indicator	✓
has crash detection	✓
has aptX	✕
Has auto pause	✓
Has passcode	✓
Compatible with smart scales	✓
Compatible with external heart rate monitors	✓
Is compatible with Windows	✕
has an external memory slot	✕
Is compatible with Mac OS X	✕
has a socket for a 3.5 mm audio jack	✕

The Apple Watch Ultra 3 includes a battery level indicator, passcode protection, auto pause, and crash detection for added safety during activity. It is compatible with smart scales and external heart rate monitors, expanding its ecosystem of supported accessories. The watch does not support aptX Bluetooth audio, has no external memory slot, and lacks a 3.5 mm headset jack. It is also not compatible with Windows or Mac OS X.

Final Verdict

The Apple Watch Ultra 3 is a technically comprehensive smartwatch built around the needs of serious athletes and outdoor users, with a specification set that leaves little room for compromise in its intended field. Its combination of 100 m waterproof depth, ECG and advanced health monitoring, multi-sport tracking, and 72-hour power-save battery life positions it as a capable tool for demanding physical activities across land and water alike. That said, its large 49 mm form factor, strict iOS exclusivity, and short standard battery life under everyday use mean it is a focused instrument rather than a universal one. For users whose activities and ecosystem align with what it offers, the Apple Watch Ultra 3 represents a well-rounded, feature-dense wearable that covers health, safety, navigation, and connectivity in a single rugged package.