I’ve tested out both the 43 and 47mm version of OnePlus Watch 3. In this article I compare the smaller iteration versus the 41mm Google Pixel Watch 3. Both are slim, unisex, lightweight smartwatches with polished designs and plenty of health tracking. On the surface, they look similar. But after a few days of switching between them, the differences became clear. One is all about comfort and battery life. The other pushes deeper into health metrics.
The OnePlus Watch 3 feels practical and straightforward. It’s light on the wrist, tracks workouts reliably, and lasts far longer than most Wear OS watches. You miss out on some of the more advanced sensors, but most core features are here. GPS, heart rate, SpO₂, and basic health functionality are all well implemented. Plus, you get a few surprise extras.
Pixel Watch 3 is a more refined experience. The curved glass, slim profile, and tight Google integration give it a premium edge. You also get skin temperature, ECG, cEDA for stress, and deeper health metrics through Fitbit. But it demands more attention. Battery life is short.
Design and comfort land differently
Starting off with design, and the OnePlus Watch 3 (43mm) has a clean, round face and a more traditional smartwatch aesthetic. The stainless steel build feels solid, and the watch wears flat and secure on the wrist. It’s light enough to forget about, even during sleep or exercise.
Pixel Watch 3, on the other hand, goes all-in on style. The domed Corning Gorilla Glass 5 blends into the aluminum case, and the 31-gram weight makes it one of the lightest smartwatches out there. If you like minimalist design, it nails that look. This generation finally introduces a larger 45mm model, but for this comparison, I stuck with the 41mm version to match sizing.
All things considered, these are two very similar looking watches. Both have a crown and a flat physical button. But the OnePlus has edges that are a bit more defined, whereas the Google device goes for a more rounded look.
Where the OnePlus wins is in display size. You get 1.32 inches of screen, versus 1.2 inches on the Pixel. Both peak at 2000 nits, but OnePlus gives you a bit more room to view your data.
Sensors and health tracking go deeper on Pixel
Pixel Watch 3 brings a bigger toolkit. You get ECG, skin temperature tracking, cEDA for stress detection, irregular rhythm alerts, and a refined multi-path optical heart rate sensor. It’s one of the most sensor-packed Wear OS watches available, and the integration with Fitbit makes good use of it. There’s also an optional Premium Subscription level with additional health insights, but you don’t really need it as you get plenty as it is.
The OnePlus Watch 3 (43mm) skips those Fitbit extras but covers the essentials. It tracks heart rate, blood oxygen, sleep, mental wellbeing, barometric data, and more. The tracking is accurate, and the dual-frequency GPS is quick to lock and stays on course. What’s missing is wrist temperature, ECG, and vascular metrics found in the 47mm model. So if you want those extras, you’ll need to opt for the larger iteration.
Essential reading: Top fitness trackers and health gadgets
For users who want deeper wellness insights and can tolerate shorter battery life, the Pixel Watch 3 makes sense. For those who just want reliable data without extra fuss, OnePlus gets the job done.
Sports tracking is solid across both
The OnePlus Watch 3 supports over 100 workout modes. Running metrics include cadence, stride length, running power, VO₂ max, and recovery scores. I compared its heart rate tracking to a Garmin, and the results were within a beat or two. GPS accuracy was also on point, even in tougher conditions like tree cover or tight city blocks. Plus you get extras, such as running dynamics metrics, with detailed charts and explanations.
Pixel Watch 3 tracks fewer activities, but makes up for it with automatic workout detection and tight integration with the Fitbit platform. It’s especially strong for casual and intermediate runners. In my tests, the GPS stayed locked in, and distance accuracy was within 200 meters of a high-end Garmin on a 10K run. The lighter weight helps the heart rate sensor maintain a snug fit, which improves accuracy.
Where the Fitbit falls short is in detailed performance feedback. There’s no training effect, load, or recovery analysis. You’ll get basics and Fitbit’s Daily Readiness Score, but that’s it.
Granted, neither of these two watches approach Garmin’s as far as sports tracking. But they are more health and fitness smartwatches, whereas Garmin devices are sports watches.
Smart features vs staying power
Both the OnePlus and Google run Wear OS 5 and feel fast. Navigation is smooth, animations are clean, and app support through the Play Store is robust. You get the usual staples like Assistant, Wallet, Maps and messaging.
Pixel Watch 3 takes it further with ultra-wideband (UWB), optional LTE, and deeper integration with Google services. Assistant is quick, call quality is great, and the whole experience just feels more complete.
As far as music storage – the OnePlus Watch 3 (43mm) has 32GB of internal memory, but there’s no built-in option to transfer MP3s directly through the official app or watch interface. Users can enable offline playback using third-party Wear OS apps like Wear Casts, which allow sideloading of audio files.
In contrast, the Google Pixel Watch 3 supports offline music through streaming services like YouTube Music and Spotify, but this requires a paid subscription. It doesn’t offer native support for local file transfers, though users can upload personal tracks to YouTube Music on desktop and then download them onto the watch as a workaround.
Battery life – not that great
Battery life is still a sticking point. Particularly for the Google device. The Pixel Watch 3’s 307 mAh cell only lasts around 24 hours with the always-on display. The new Battery Saver mode can stretch that to about 36 hours, and charging is 20% faster than before, but you’ll still be topping up daily.
The OnePlus Watch 3 (43mm) lasts longer. With a 345 mAh battery, you can get up to 60 hours in standard use, and up to 7 days in Power Saver mode. A 10-minute top-up gives you a full day. It’s the less demanding watch, and that matters if you don’t want to think about charging. For really great battery life, opt for the 47mm variant. That one almost doubles what you get on the 43mm version.
Our takeaway
The OnePlus Watch 3 (43mm) and Google Pixel Watch 3 are both strong choices in the mid-range Wear OS space. But they suit different users.
If you want a straightforward watch that nails the basics, lasts for days, and tracks workouts accurately, the OnePlus Watch 3 makes a strong case. It doesn’t have all the bells and whistles, but it’s practical, comfortable, and reliable.
The Google Pixel Watch 3 is smarter, sleeker and more ambitious. It tracks more health signals, fits tighter into Google’s ecosystem, and offers a polished user experience. But it needs more attention, and some features sit behind a subscription.
Pick based on what you value more: battery life and simplicity, or deeper insights and a tight Google experience.
OnePlus Watch 3 (43mm) can be purchased from OnePlus or Amazon.*
Google Pixel Watch 3 can be purchased on Amazon.
Also make sure to check out our comparison of the 47mm OnePlus Watch 3 vs Google Pixel Watch.
OnePlus Watch 3 (43mm) vs Google Pixel Watch 3 (41mm): Specs comparison
Feature
OnePlus Watch 3 (43mm)
Google Pixel Watch 3 (41mm)
Release date
Jul-25
Aug-24
Case material
Stainless steel, plastic bottom
Domed top glass, recycled aluminum
Buttons
Rotating crown + flat button
Digital crown + button
Shape
Round
Round
Size
43.2 x 43.2 x 11 mm
41 x 41 x 12.3 mm
Display type
AMOLED
AMOLED LTPO, Gorilla Glass 5
Display resolution
466 x 466 pixels, up to 2000 nits
320 ppi, up to 2000 nits, 1–60Hz refresh
Display size
1.32 inches
1.2 inches
Weight
38g
31g
Sensors
Accelerometer, gyroscope, optical heart rate sensor, optical pulse oximeter, geomagnetic sensor, light sensor, barometer
Compass, Altimeter, Red and infrared sensors for SpO2, Multipurpose ECG sensors, Multi-path optical heart rate sensor, 3-axis accelerometer, Gyroscope Ambient light sensor, cEDA, Skin temperature sensor, Barometer, Magnetometer, Ambient light sensor
Water resistance
5 ATM, IP68, MIL-STD-810H
5 ATM
Satellite connectivity
Dual-band GNSS (L1+L5)
GPS, Glonass, QZSS, Beidou, Galileo
Microphone/Speaker
Yes / Yes
Yes / Yes
NFC
Yes
Yes
Music storage
Yes
Yes
Connectivity
Bluetooth 5.2, Wi-Fi 5/2.4GHz
Bluetooth 5.3, Wi-Fi, UWB
Cellular
No
Optional
Battery capacity
345 mAh
307 mAh
Battery life
Up to 60h regular, 7 days power saver
Up to 36h Battery Saver, 24h AOD
OS
Wear OS 5 + RTOS
Wear OS 5
Colours
Black Steel, Silver Steel
Matte Black, Polished Silver, Champagne Gold
Price
$300
Starting at $350
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