OnePlus Watch 3

Name: OnePlus Watch 3
Brand: OnePlus
SKU: 8856

Manufacturer: OnePlus

The OnePlus Watch 3 is a feature-rich smartwatch built around a 1.5-inch OLED/AMOLED screen with a resolution of 466 × 466 pixels and a pixel density of 439 ppi, housed in a case measuring 47.6 × 46.6 mm at 11.8 mm thick. The watch weighs 81 g, supports an always-on display, and is fitted with sapphire glass for added surface durability. Its band is replaceable and measures 22 mm in width, and the device is rated for operation in temperatures ranging from -40 °C to 70 °C.

On the health and sensor side, the OnePlus Watch 3 includes a heart rate monitor, pulse oximeter, body temperature sensor, barometer, gyroscope, accelerometer, compass, and cadence sensor, alongside HRV tracking and VO2 max measurement. It supports GPS with fast lock acquisition, Galileo, Bluetooth 5.2, Wi-Fi 4 (802.11n), and NFC. The watch carries an IP68 rating and a 5 ATM water resistance rating to a depth of 50 m. Its 631 mAh rechargeable battery is rated for five days of use with a one-hour charge time. Internally, it offers 2 GB of RAM and 32 GB of storage, and it is compatible with Android devices only.

Pros

Sapphire glass display offers solid scratch resistance without relying on branded protective coatings
Comprehensive sensor suite covers heart rate, blood oxygenation, body temperature, barometer, gyroscope, compass, cadence, and GPS in a single device
HRV tracking, VO2 max measurement, readiness level, and fall detection add meaningful depth to health monitoring
32 GB of internal storage and 2 GB of RAM provide substantial onboard capacity for a smartwatch
The companion app is free and ad-free, covering calorie burn, water intake, weight, temperature, and sleep reporting at no extra cost
Rated to operate between -40 °C and 70 °C, making it suitable for use in demanding environmental conditions

Cons

No iOS compatibility limits the device to Android users only
Wireless charging is not supported, requiring a physical cable connection every time the battery needs replenishing
ECG technology and irregular heart rate warnings are absent despite the breadth of other cardiac monitoring features
Multi-sport mode is not available, which may limit structured tracking for users who switch between different workout types
No cellular module means the watch depends entirely on a paired phone for network-based functions
The app does not support route planning or data export to email, reducing flexibility for users who want to manage workout data externally

Who is this for?

The OnePlus Watch 3 is well suited to Android users who want a health-focused wearable with a wide sensor array, covering HRV, VO2 max, blood oxygenation, body temperature, and fall detection without needing a separate device. Its IP68 rating, 5 ATM water resistance, and operating range from -40 °C to 70 °C make it a practical choice for people who train or work in demanding outdoor or aquatic environments. Those who value self-contained functionality will also benefit from its 32 GB of internal storage, onboard GPS with fast lock, and music playback, allowing workouts without a phone nearby. The free, ad-free companion app with sleep reporting, calorie tracking, water intake logging, and calendar sync makes it equally relevant for users focused on day-to-day wellness monitoring alongside structured exercise.

Who is this NOT for?

The OnePlus Watch 3 is not a good fit for iPhone users, as it offers no iOS compatibility whatsoever. Users who rely on advanced cardiac monitoring tools will find the absence of ECG technology and irregular heart rate warnings a notable gap, particularly those managing specific health conditions that benefit from these features. The lack of a cellular module means it cannot function independently for calls or data when away from a paired phone, which limits its appeal for users who want a standalone connected device. Additionally, those who rotate between many different sporting disciplines may find the absence of a multi-sport mode restrictive, and users who prefer wireless charging will need to adapt to wired-only recharging.

Design:

screen size	1.5"
Display type	OLED/AMOLED
water resistance	Water resistant
ATM rating	5 ATM
Ingress Protection (IP) rating	IP68
waterproof depth rating	50 m
Always-On Display	✓
pixel density	439 ppi
resolution	466 x 466 px
Watch band is replaceable	✓
has branded damage-resistant glass	✕
thickness	11.8 mm
weight	81 g
height	47.6 mm
width	46.6 mm
maximum operating temperature	70 °C
lowest potential operating temperature	-40 °C
Has a display	✓
has a touch screen	✓
Has sapphire glass display	✓
volume	26.174288 cm³
is designed for kids	✕
width of band	22 mm

The OnePlus Watch 3 features a 1.5″ OLED/AMOLED touchscreen with a resolution of 466 × 466 pixels and a pixel density of 439 ppi, and it supports an always-on display mode. The screen is protected by sapphire glass, though no branded damage-resistant glass is used. The case measures 47.6 × 46.6 mm with a thickness of 11.8 mm and a volume of 26.174288 cm³, and the watch weighs 81 g. It comes with a replaceable 22 mm band and carries a 5 ATM rating alongside an IP68 certification, with a waterproof depth rating of 50 m. The device is rated to operate in temperatures ranging from -40 °C to 70 °C, and 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 OnePlus Watch 3 is equipped with a broad range of sensors, including a heart rate monitor and a pulse oximeter for continuous cardiovascular and blood oxygenation tracking, as well as a body temperature sensor. Motion and orientation are covered by an accelerometer, gyroscope, and compass, while a barometer handles atmospheric pressure readings and a cadence sensor supports movement rhythm tracking. GPS is built in for location and route data. Perspiration monitoring is not supported.

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	✓
Tracks calorie intake	✓
Designed for golf	✕

The OnePlus Watch 3 covers a wide range of activity tracking capabilities, logging steps, distance, pace, and elevation, and it includes a route tracker for recording movement paths. Sleep tracking is supported along with detailed sleep reports, giving users insight into their rest patterns. The watch detects activities automatically and supports exercise tagging, making it easier to organize workout data without manual input. Calorie intake tracking is also available. However, the watch does not offer a dedicated multi-sport mode and is not designed for golf.

Connectivity:

has a cellular module	✕
Is compatible with iOS	✕
Is compatible with Android	✓
Bluetooth version	5.2
supports Wi-Fi	✓
Wi-Fi version	Wi-Fi 4 (802.11n)
supports ANT+	✕
has NFC	✓
supports Galileo	✓

The OnePlus Watch 3 connects to Android devices only, with no compatibility for iOS. It uses Bluetooth 5.2 and supports Wi-Fi 4 (802.11n), while NFC is also on board. For satellite navigation, the watch supports Galileo in addition to its built-in GPS. There is no cellular module, meaning the watch relies on a paired phone for network-dependent functions, and ANT+ is not supported.

Battery:

battery life	5 days
battery power	631 mAh
charge time	1 hours
has wireless charging	✕
has a rechargeable battery	✓
Has a solar power battery	✕
has a removable battery	✕

The OnePlus Watch 3 is powered by a rechargeable 631 mAh battery with a rated life of five days, and it charges fully in approximately one hour. The battery is fixed and cannot be removed, and the watch does not support wireless or solar charging, so a wired connection is required for recharging.

Features:

has HRV tracking	✓
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 ECG technology	✕
Has silent alarm	✓
Has vibrating alerts	✓
has fall detection	✓
Has a stopwatch	✓
Has smart alarm	✕
has voice commands	✓
RAM	2GB
internal storage	32GB
Has a built-in camera remote control function	✓
Acquires GPS faster	✓
warranty period	1 years
has a front camera	✕

The OnePlus Watch 3 offers a broad set of health features, including HRV tracking, VO2 max measurement, resting heart rate monitoring, fast and slow heart rate notifications, and a readiness and recovery indicator. Fall detection is also present, though ECG technology and irregular heart rate warnings are not supported. On the communication side, the watch can answer calls, manage call control, deliver wrist notifications, and respond to voice commands, while a phone-finder function and camera remote shutter are included as well. Silent alarm and vibrating alerts are available, but there is no smart alarm. Internally, the watch carries 2 GB of RAM and 32 GB of storage, and it features fast GPS lock acquisition. It has no front camera, and the warranty period is one year.

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	✕
Syncs with existing calendars	✓
Has voice feedback	✓
Has music playback	✓
Exports to email	✕
Doesn’t require account	✕
Supports widgets	✓
Can be personalised	✓
Has barcode scanner on app	✕
Tracks water intake	✓
Has weight tracking	✓

The companion app for the OnePlus Watch 3 is free and ad-free, and it requires an account to use. It provides activity reports, inactivity alerts, and an exercise diary, along with goal setting and an achievements system to support structured fitness habits. Calorie burn tracking, water intake tracking, and weight tracking are all available, as is temperature tracking. The app supports calendar sync, voice feedback, music playback, widgets, and personalisation options. Data export to email, route support, period notifications, a barcode scanner, and coaching features are not included.

Miscellaneous:

has a battery level indicator	✓
Has passcode	✓
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 OnePlus Watch 3 includes a battery level indicator and passcode support for basic monitoring and security. It does not offer an external memory slot or a 3.5 mm audio jack, and it is not compatible with Windows or Mac OS X.

Final Verdict

The OnePlus Watch 3 is a well-specified Android smartwatch that brings together a dense sensor package, a sharp sapphire-protected AMOLED display, and a capable health monitoring suite covering HRV, VO2 max, blood oxygenation, and fall detection — all in a rugged, water-resistant build rated for genuinely demanding conditions. Its 32 GB of internal storage, onboard GPS, and ad-free companion app give it a degree of self-sufficiency that suits active users who want meaningful data without depending entirely on a paired phone. The absence of ECG, cellular connectivity, and iOS support narrows its audience, and those with more advanced cardiac monitoring needs or multi-platform households may find it falls short. For Android users seeking a feature-rich health and fitness wearable with solid build quality and broad tracking capabilities, the OnePlus Watch 3 makes a coherent and capable case for itself.