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MobileIQ

Head to head

Google Google Pixel Watch 4 45mmvsSamsung Galaxy Watch8 Classic 46mm

Released
2025-10-09Google blog — Pixel Watch 4, retrieved 2026-09-13
Price
£399Google Store UK — Pixel Watch 4 45 mm, retrieved 2026-09-22
Security updates until
Not published by the makerGoogle Store UK — Pixel Watch 4 specs, retrieved 2026-09-13
Released
2025-07-25Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Price
£449Samsung Newsroom UK — Galaxy Watch8 series, retrieved 2026-09-13
Security updates until
Not published by the makerSamsung UK — How to update software on Galaxy Watch, retrieved 2026-09-13

1 win for Google Pixel Watch 4 45mm0 wins for Galaxy Watch8 Classic 46mm1 gap borderline0 differences you won’t notice£50 apart at RRP

Verdict: Google Pixel Watch 4 45mm ahead on 1 row, Galaxy Watch8 Classic 46mm on none

On the makers’ published figures, the Google Pixel Watch 4 45mm wins on weight (case only) (36.7 g against 63.5 g). One gap is borderline, a difference most people would not notice: case size (45 mm against 46 mm). Both state the same peak brightness. The other 29 rows have no threshold or no direction to judge by, so nobody wins them.

True to scale

Google Pixel Watch 4 45mm · 45 × 45 mmGalaxy Watch8 Classic 46mm · 46.4 × 46 mm

Case outlines from each maker’s published dimensions, drawn to scale. A round case is an ellipse at those figures.

Specifications

A win is marked only where the figures can be ranked and the gap is one you could notice on the wrist. A row the site has no threshold for says whether the two differ, and that it is not ranking them. = marks the same figure on both, ≠ not ranked a difference with no ranking. Every figure carries its source.

Body

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
DimensionsDiffers, but not ranked.
45 x 45 x 12.3 mmOfficial
46.4 x 46 x 10.6 mmOfficial
Case size
45mmOfficial
46mmOfficial

Marginal — most people won’t notice.

Case shapeSame.
roundOfficial
roundOfficial
Weight (case only)
36.7gOfficialwins this row
63.5gOfficial

Google Pixel Watch 4 45mm is ahead here, by a gap you’d notice.

Case materialDiffers, but not ranked.
100% recycled aluminiumOfficial
Stainless SteelOfficial
Water ratingDiffers, but not ranked.
5 ATM, IP68Official
5 ATM + IP68 / MIL-STD-810HOfficial

Display

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
Display typeDiffers, but not ranked.
Actua 360 AMOLED LTPO display with DCI-P3 colour, Always-on displayOfficial
Super AMOLED, Full Colour Always On DisplayOfficial
Display size
No verified data
1.34inOfficial
Resolution
No verified data
438 x 438Official
Peak brightnessSame.
3000nitsOfficial
3000nitsOfficial
Always-on displaySame.
YesOfficial
YesOfficial

Platform

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
Operating systemDiffers, but not ranked.
Wear OS 6.0Official
Wear OS 6Official
ChipDiffers, but not ranked.
Qualcomm Snapdragon W5 Gen 2, Cortex-M55 co-processorOfficial
Exynos W1000 (5 core, 3nm)Official
StorageDiffers, but not ranked.
32GBOfficial
64GBOfficial
RAMSame.
2GB3rd party
2GB3rd party

Battery

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
Battery life (maker's claim)
40hOfficial
40hOfficial

Different test conditions, not ranked.

Battery capacityDiffers, but not ranked.
455mAh3rd party
445mAhOfficial

Samsung UK — Galaxy Watch8 Classic 46mm specs claims 445 mAh · GSMArena reports 445 mAh

Charge to 80%
30minOfficial
No verified data
ChargingDiffers, but not ranked.
Quick Charge DockOfficial
Fast Charging (WPC-based wireless charging)Official

Health

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
SensorsDiffers, but not ranked.
Compass, altimeter, red and infrared sensors for oxygen saturation (SpO2) monitoring, multipurpose electrical sensors compatible with ECG app, multi-path optical heart rate sensor, 3-axis accelerometer, gyroscope, ambient light sensor, electrical sensor to measure skin conductance (cEDA), far-field skin temperature sensor, barometer, magnetometerOfficial
Samsung BioActive Sensor (Optical Bio-signal Sensor + Electrical Heart Signal + Bioelectrical Impedance Analysis), Temperature Sensor, Accelerometer, Barometer, Gyro Sensor, Geomagnetic Sensor, Light Sensor, 3D Hall sensorOfficial
ECGSame.
YesOfficial
YesOfficial
Blood oxygen
YesOfficial
No verified data
Skin temperatureSame.
YesOfficial
YesOfficial
GPSDiffers, but not ranked.
Dual-frequency GPS: GPS, Galileo, GLONASSOfficial
L1+L5 Dual-Frequency GPS (GPS, Glonass, Beidou, Galileo)Official

Connectivity

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
Cellular modelSame.
YesOfficial
YesOfficial
Cellular model price
No verified data
£499Official
UK networks with eSIMSame.
EE, Vodafone3rd party
EE, Vodafone3rd party
Wi-Fi
802.11a/b/g/n/ac/ax 2.4 GHz, 5 GHzOfficial
No verified data
BluetoothDiffers, but not ranked.
6.0Official
5.3Official
NFC paymentsSame.
YesOfficial
YesOfficial

Compatibility

SpecificationGoogle Pixel Watch 4 45mmSamsung Galaxy Watch8 Classic 46mm
Works withDiffers, but not ranked.
Works with most phones running on Android 11.0 or newer. Requires a Google Account and the Google Pixel Watch app.Official
Android 11.0 or higher and with more than 1.5GB of memoryOfficial
CompatibilityDiffers, but not ranked.
Android; some features need a Google phoneOfficial
Android; some features need a Samsung phoneOfficial
3 attributes neither watch has a sourced figure for

Strap width · Display area · Blood pressure. Rows appear as sources are cited — a gap in our data, not a statement about either watch.

The pairs a buyer of either watch would also weigh. Any two watches in the catalogue can be compared from the chooser.