Apple Watch SE 3

Name: Apple Watch SE 3
Brand: Apple
SKU: 38670

Manufacturer: Apple

The Apple Watch SE 3 is a feature-rich smartwatch from Apple that covers a broad range of everyday health, fitness, and communication needs. Housed in a 44 mm case weighing just 33 g, it pairs a sharp 368 x 448 px OLED screen with always-on display functionality, making at-a-glance information consistently accessible throughout the day. The band is fully replaceable, and the watch ships with damage-resistant glass for added durability.

On the connectivity side, the Apple Watch SE 3 supports Bluetooth 5.3, Wi-Fi 4, NFC, and includes a single eSIM for standalone cellular use, though it is exclusively compatible with iOS devices. Its sensor suite covers heart rate monitoring, GPS, accelerometer, gyroscope, barometer, compass, and a body temperature sensor, while activity tracking extends to sleep, elevation, pace, route mapping, swim stroke counting, and multi-sport mode. Battery life reaches up to 32 hours in power-save mode, wireless charging is supported, and 64 GB of internal storage is available onboard. Safety features include fall detection and crash detection, rounding out a specification set oriented toward active, health-conscious users.

Pros

Built-in cellular connectivity via eSIM allows the watch to function independently without a paired phone
Comprehensive sensor suite includes heart rate monitor, GPS, accelerometer, gyroscope, barometer, compass, and body temperature sensor
Fall detection and crash detection add a meaningful layer of passive safety monitoring
64 GB of internal storage provides substantial space for music and apps directly on the watch
Water resistance rated to 50 m with 5 ATM and IP68 certification makes it suitable for swimming and water-based activities
Always-on OLED display with 326 ppi pixel density ensures clear, consistently visible information on the wrist

Cons

Battery life of 0.75 days under standard use requires daily charging, which may be inconvenient for some users
No blood oxygen (pulse oximeter) monitoring despite having a body temperature sensor limits health tracking depth
Exclusively compatible with iOS, making it unusable for Android users
Does not support VO2 max measurement or readiness and recovery scoring, which limits advanced fitness insights
Wi-Fi support is limited to Wi-Fi 4 (802.11n), an older standard
No cadence sensor, which restricts cycling-specific performance tracking

Who is this for?

This watch suits iPhone users who want a well-rounded daily companion that handles both health monitoring and communication without needing a phone nearby. The built-in cellular module with eSIM makes it a practical choice for those who run, swim, or exercise independently, particularly given its 50 m water resistance, swim stroke counting, and multi-sport mode. Users who value passive safety features will also find it relevant, as fall detection and crash detection run continuously in the background. The broad activity tracking — covering sleep, elevation, pace, route mapping, and automatic activity detection — serves those who want a thorough picture of their daily movement without manually logging workouts. Additionally, the ovulation prediction and cycle tracking features make it a strong fit for users who prioritize reproductive health monitoring alongside general fitness.

Who is this NOT for?

Users who rely on an Android device will find this watch entirely incompatible, as it only works with iOS. Those who need advanced fitness metrics will encounter clear gaps — VO2 max measurement is absent, there is no cadence sensor for cycling, no blood oxygen monitoring, and no readiness or recovery scoring, all of which limit its appeal for performance-focused athletes. The standard battery life of just 0.75 days makes it a poor match for users who dislike frequent charging or who need multi-day endurance, such as hikers or travelers. Anyone looking for diving-specific functionality will also find it unsuitable, as it is not designed for that activity despite its water resistance rating.

Design:

screen size	1.78"
Display type	OLED/AMOLED
water resistance	Waterproof
ATM rating	5 ATM
Ingress Protection (IP) rating	IP68
waterproof depth rating	50 m
Always-On Display	✓
pixel density	326 ppi
resolution	368 x 448 px
Watch band is replaceable	✓
has branded damage-resistant glass	✓
thickness	10.7 mm
weight	33 g
height	44 mm
width	38 mm
maximum operating temperature	35 °C
lowest potential operating temperature	0 °C
Has a display	✓
has a touch screen	✓
Has sapphire glass display	✕
volume	17.8904 cm³
maximum altitude	10000 feet

The Apple Watch SE 3 features a 1.78″ OLED/AMOLED touchscreen with a resolution of 368 x 448 px and a pixel density of 326 ppi, complemented by an always-on display for continuous visibility. The case measures 44 mm in height, 38 mm in width, and 10.7 mm in thickness, with a total weight of just 33 g and a volume of 17.8904 cm³. It is built with branded damage-resistant glass — though not sapphire glass — and ships with a replaceable band. Water resistance is rated at 5 ATM and IP68, covering a waterproof depth of up to 50 m, while the watch operates within a temperature range of 0 °C to 35 °C and supports use at altitudes of up to 10,000 feet.

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 SE 3 includes a solid array of onboard sensors, with a heart rate monitor, built-in GPS, accelerometer, gyroscope, compass, barometer, and a body temperature sensor all present. These components collectively support a wide range of movement tracking, navigation, and health monitoring functions. However, the watch does not include a pulse oximeter for blood oxygenation monitoring, 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 SE 3 offers a comprehensive set of activity tracking capabilities, covering steps, distance, pace, elevation, and route tracking, alongside automatic activity detection and exercise tagging for a hands-free logging experience. Sleep tracking is supported and accompanied by detailed sleep reports, while multi-sport mode and a swim stroke counter extend its usefulness across a variety of physical activities. Calorie intake tracking is not available, and the watch is not designed for diving or golf specifically.

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 SE 3 includes a cellular module with a single eSIM, allowing it to operate independently of a paired phone on supported networks, and is exclusively compatible with iOS — Android is not supported. Wireless connectivity is handled via Bluetooth 5.3 and Wi-Fi 4 (802.11n), while NFC is also present for contactless interactions. The watch supports the Galileo satellite navigation system and ANT+ is not supported.

Battery:

battery life	0.75 days
battery life in power save mode	32 hours
has wireless charging	✓
has a rechargeable battery	✓
Has a solar power battery	✕
has a removable battery	✕

The Apple Watch SE 3 houses a rechargeable, non-removable battery with a standard battery life of 0.75 days, extending to 32 hours in power-save mode. Charging is handled wirelessly, removing the need for a cable connection. The watch does not feature a solar charging option.

Features:

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

The Apple Watch SE 3 covers a broad range of practical features, including resting heart rate measurement, fast and slow heart rate notifications, irregular heart rate warnings, fall detection, and call answering and control capabilities via its single built-in microphone. Wrist notifications, vibrating alerts, a silent alarm, a smart alarm, a stopwatch, voice commands, and a phone-locating function are all present, alongside a camera remote shutter control. The watch offers 64 GB of internal storage but does not include a front camera, and it does not measure VO2 max, provide a readiness or recovery score, or feature fast GPS lock.

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	✓
Has voice feedback	✓
Has music playback	✓
Exports to email	✕
Predicts ovulation	✓
Predicts start date	✓
Can be personalised	✓
Has barcode scanner on app	✕
Tracks water intake	✕
Has weight tracking	✕

The accompanying app for the Apple Watch SE 3 is free and ad-free, with support for personalisation to suit individual preferences. It provides activity reports, an exercise diary, calorie burn tracking, goal setting, inactivity alerts, achievements, voice feedback, and music playback during workouts. Temperature tracking, period notifications, ovulation prediction, and cycle start date prediction are all included, broadening its health monitoring scope. Coaching, email export, barcode scanning, water intake tracking, and weight tracking are not available within the app.

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 SE 3 includes a battery level indicator, passcode protection, auto pause, and crash detection as standard utility features. It is compatible with smart scales and external heart rate monitors, and works with Mac OS X, though Windows compatibility is not supported. The watch does not have a 3.5 mm audio jack, an external memory slot, or aptX Bluetooth audio support.

Final Verdict

The Apple Watch SE 3 presents a well-rounded specification set for iPhone users seeking a capable daily smartwatch that covers health monitoring, fitness tracking, and independent communication in a single compact device. Its cellular connectivity paired with a comprehensive sensor suite — spanning heart rate, GPS, body temperature, barometer, and more — gives it genuine versatility across everyday health tracking and active use. While it does leave gaps for performance-oriented users who need metrics like VO2 max or blood oxygen monitoring, and its standard battery life demands daily charging, these trade-offs are consistent with its intended positioning as a broadly capable, safety-conscious smartwatch rather than a specialist fitness tool. For iOS users who want reliable activity tracking, passive safety features like fall and crash detection, and the freedom to leave their phone behind, the Apple Watch SE 3 represents a solid and fully featured option.