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MobileIQ

Head to head

Apple Apple Watch Ultra 4 49mmvsSamsung Galaxy Watch Ultra2 47mm

Released
2026-09-18Apple UK Newsroom — Apple Watch Ultra 4, retrieved 2026-09-13
Price
£749Apple UK store, retrieved 2026-09-13
Security updates until
Not published by the makerApple UK — watchOS 27 compatible models, retrieved 2026-09-22
Released
2026-08-07Samsung Newsroom UK — Galaxy Watch Ultra2 and Watch9, retrieved 2026-09-13
Price
£649Samsung Newsroom UK — Galaxy Watch Ultra2 and Watch9, retrieved 2026-09-22
Security updates until
Not published by the makerSamsung UK — How to update software on Galaxy Watch, retrieved 2026-09-13

0 wins for Apple Watch Ultra 4 49mm2 wins for Galaxy Watch Ultra2 47mm1 gap borderline1 difference you won’t notice£100 apart at RRP

Verdict: Galaxy Watch Ultra2 47mm ahead on 2 rows, Apple Watch Ultra 4 49mm on none

On the makers’ published figures, the Galaxy Watch Ultra2 47mm wins on peak brightness (5,000 nits against 3,000 nits) and battery life (maker's claim) (80 h against 50 h). One gap is borderline, a difference most people would not notice: case size (49 mm against 47 mm). The difference in weight (case only) is below the threshold you would notice. The other 29 rows have no threshold or no direction to judge by, so nobody wins them.

True to scale

Apple Watch Ultra 4 49mm · 49 × 44 mmGalaxy Watch Ultra2 47mm · 47.4 × 47.1 mm

Case outlines from each maker’s published dimensions, drawn to scale. A round case is an ellipse at those figures; rectangular corner rounding is our drawing convention, not a measurement.

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

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
DimensionsDiffers, but not ranked.
49 x 44 x 12 mmOfficial
47.4 x 47.1 x 10.7 mmOfficial
Case size
49mmOfficial
47mmOfficial

Marginal — most people won’t notice.

Case shapeDiffers, but not ranked.
rectangularOfficial
roundOfficial
Weight (case only)
63gOfficial
61.5gOfficial

You won’t notice this difference.

Case materialSame.
TitaniumOfficial
TitaniumOfficial
Water ratingDiffers, but not ranked.
Water resistance 100m (swim, snorkel, scuba, high-speed water sports) under ISO standard 22810:2010; EN13319 recreational scuba diving to 40mOfficial
10 ATM, IP69K, MIL-STD-810H, EN13319Official

Display

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
Display typeDiffers, but not ranked.
Always-On Retina display with wide-angle OLEDs and LTPO3Official
Super AMOLED, Full Colour Always On DisplayOfficial
Display size
No verified data
1.52inOfficial
Display area
1245mm²Official
No verified data
ResolutionDiffers, but not ranked.
422 x 514Official
498 x 498Official
Peak brightness
3000nitsOfficial
5000nitsOfficialwins this row

Galaxy Watch Ultra2 47mm is ahead here, by a gap you’d notice.

Always-on displaySame.
YesOfficial
YesOfficial

Platform

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
Operating systemDiffers, but not ranked.
watchOS 27Official
Wear OS 7Official
ChipDiffers, but not ranked.
S11 SiPOfficial
Qualcomm SDW6100 (Snapdragon Wear Elite, 3nm, 5 core)Official
StorageSame.
64GBOfficial
64GBOfficial
RAM
No verified data
2GB3rd party

Battery

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
Battery life (maker's claim)
50hOfficial
80hOfficialwins this row

Galaxy Watch Ultra2 47mm is ahead here, by a gap you’d notice.

Battery capacity
No verified data
800mAh3rd party
Charge to 80%
45minOfficial
No verified data
ChargingDiffers, but not ranked.
Fast-charge capable, Apple Watch Magnetic Fast Charger to USB-C CableOfficial
Fast Charging, up to 40% in around 30 minutesOfficial

Health

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
SensorsDiffers, but not ranked.
Health Sensing System (third-generation electrical heart sensor, always-on optical heart sensor, blood oxygen sensor, temperature sensor), depth gauge, water temperature sensor, compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensorOfficial
Accelerometer, Barometer, Bioelectrical Impedance Analysis Sensor, Electrical Heart Sensor, Gyro Sensor, Geomagnetic Sensor, Light Sensor, Optical Heart Rate Sensor, Temperature SensorOfficial
ECGSame.
YesOfficial
YesOfficial
Blood oxygen
YesOfficial
No verified data
Skin temperatureSame.
YesOfficial
YesOfficial
GPSDiffers, but not ranked.
Precision dual-frequency GPS (GPS, Galileo, QZSS and BeiDou)Official
L1+L5 Dual-Frequency GPS (GPS, Glonass, Beidou, Galileo, QZSS)Official

Connectivity

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
Cellular modelSame.
YesOfficial
YesOfficial
Cellular model price
No verified data
£649Official
UK networks with eSIMDiffers, but not ranked.
EE, Vodafone, Three3rd party
EE, Vodafone3rd party
Wi-FiDiffers, but not ranked.
Wi-Fi 4 (802.11n)Official
802.11a/b/g/n 2.4GHz+5GHzOfficial
BluetoothDiffers, but not ranked.
5.3Official
6.0Official
NFC paymentsSame.
YesOfficial
YesOfficial

Compatibility

SpecificationApple Watch Ultra 4 49mmSamsung Galaxy Watch Ultra2 47mm
Works withDiffers, but not ranked.
iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or laterOfficial
Android 13.0 or higher and with more than 1.5GB of memoryOfficial
CompatibilityDiffers, but not ranked.
iPhone onlyOfficial
Android; some features need a Samsung phoneOfficial
2 attributes neither watch has a sourced figure for

Strap width · 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.