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Samsung Galaxy Watch Ultra2 vs Samsung Galaxy Watch9

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

SamsungGalaxy Watch Ultra2SamsungGalaxy Watch9
Overview
ReleasedAugust 2026August 2026
Display
Case sizes47 mm40 mm or 44 mm
PanelOLEDOLED
Peak brightness5,000 nits3,000 nits
Always-on displayYesYes
Display detailSuper AMOLED with full-colour Always On Display; 1.52-inch (38.5 mm) with 498 x 498 pixels; 16M colours; 5,000 nits is the localised peak under high ambient lightSuper AMOLED with full-colour Always On Display; 40mm is 1.34-inch (34 mm) with 438 x 438 pixels, 44mm is 1.47-inch (37.3 mm) with 480 x 480 pixels; 16M colours
Screen protectionSapphire CrystalSapphire Crystal
Health and fitness
ECGYesYes
Blood oxygenYesYes
Skin temperatureYesYes
Sleep apnoea alertsYesYes
High blood pressure alertsNoNo
Body compositionYesYes
Fall detectionYesYes
Crash detectionNoNo
GPSDual-band (L1 and L5)Dual-band (L1 and L5)
Water resistance100 m50 m
SensorsSamsung BioActive Sensor (optical bio-signal sensor, electrical heart signal sensor and bioelectrical impedance analysis sensor); temperature sensor; accelerometer; barometer; gyro sensor; geomagnetic sensor; light sensorSamsung BioActive Sensor (optical bio-signal sensor, electrical heart signal sensor and bioelectrical impedance analysis sensor); temperature sensor; accelerometer; barometer; gyro sensor; geomagnetic sensor; light sensor
Health featuresECG with Irregular Heart Rhythm Notification, blood pressure (calibrated against an arm cuff every 4 weeks) and sleep apnoea detection in the Samsung Health Monitor app, which needs a Galaxy phone; Vitals (heart rate, heart rate variability, respiratory rate, skin temperature and blood oxygen during sleep, against a personal baseline); Heart Health Score; Vascular Load; Antioxidant Index; AGEs Index; Energy Score; sleep tracking, Sleep Coaching and Bedtime Guidance; body composition; High Stress Alert; Cycle Tracking; Hearing, with alerts for unsafe noise levelsECG with Irregular Heart Rhythm Notification, blood pressure (calibrated against an arm cuff every 4 weeks) and sleep apnoea detection in the Samsung Health Monitor app, which needs a Galaxy phone; Vitals (heart rate, heart rate variability, respiratory rate, skin temperature and blood oxygen during sleep, against a personal baseline); Heart Health Score; Vascular Load; Antioxidant Index; AGEs Index; Energy Score; sleep tracking, Sleep Coaching and Bedtime Guidance; body composition; High Stress Alert; Cycle Tracking; Hearing, with alerts for unsafe noise levels
Fitness featuresTrail Run with GPX routes, turn-by-turn navigation, Climb Guidance and Water Intake Alarm; Depth app for depth, dive time and water temperature to 40 m; direct connection to cycling power, speed and cadence sensors; Track Back; Running Coach; Fitness Index; Daily Cardio Load; Personalised Heart Rate Zone; Personalised Functional Threshold Power; Strava and iFIT appsRunning Coach; Fitness Index; Daily Cardio Load; Personalised Heart Rate Zone; Personalised Functional Threshold Power; Strava and iFIT apps
Safety featuresEmergency SOS (five presses of the home button); Fall Detection; 86 dB siren heard up to 180 m (hold the orange Quick Button for 5 seconds)Emergency SOS; Fall Detection
Battery and connections
Battery life (maker's claim)Up to 60 hoursUp to 30 hours
Mobile data optionYesYes
Works withAndroidAndroid
ChipSnapdragon Wear EliteSnapdragon Wear Elite
Storage64 GB32 GB
Battery life detailUp to 60 hours with Always On Display on and up to 80 hours with it off; GPS up to 20 hours and GPX route navigation up to 16 hours with power saving mode (Standard) on during exercise; 800 mAh typical capacityUp to 30 hours with Always On Display on and up to 40 hours with it off (Samsung's typical-use tests); 390 mAh (40mm) or 445 mAh (44mm) typical capacity
ChargingHigh-Frequency Fast Charging (WPC-based wireless charging) to 40% in about 30 minutes with the Fast Wireless Charger (EP-OL715) in the box and a 5 V / 2 A PD adapterFast Charging (WPC-based wireless charging); Wireless Charger in the box
ConnectivityLTE with eSIM (4G LTE and 3G); Bluetooth 6.0; Wi-Fi 802.11a/b/g/n at 2.4 GHz and 5 GHz; NFC; L1 + L5 dual-frequency GPS with Glonass, Beidou, Galileo and QZSS; pairs with Android 13 or later phones with more than 1.5 GB of memoryLTE models with eSIM (4G LTE and 3G); Bluetooth 6.0; Wi-Fi 802.11a/b/g/n at 2.4 GHz and 5 GHz; NFC; L1 + L5 dual-frequency GPS with Glonass, Beidou, Galileo and QZSS; pairs with Android 13 or later phones with more than 1.5 GB of memory
Storage2 GB memory; 64 GB storage (49.3 GB available)2 GB memory; 32 GB storage (20.1 GB available)
Design
Weight (lightest version)61.5 g31.5 g
SoftwareWear OSWear OS
Case materialsTitanium case (titanium on the front and back cover areas of the frame, the rest of the frame is plastic and other materials); Sapphire Crystal; 10ATM (100 m, ISO 22810, tested in salt and chlorinated water), IP68 and IP69K; EN13319; MIL-STD-810H; works on the wrist from -20°C to 55°CAluminium case; Sapphire Crystal; 5ATM (50 m, ISO 22810, fresh water) and IP68 (IPX8 to 1.5 m for 30 minutes; IP6X dust); MIL-STD-810H
Size47.4 x 47.1 x 10.7 mm; 61.5 g (watch body without band)40mm is 42.7 x 40.4 x 8.6 mm and 31.5 g; 44mm is 46.0 x 43.7 x 8.6 mm and 34.0 g; weights are for the watch body without band, lightest is the 40mm
BandsMarine Band (S/M/L) in the box, with an Air Pocket inner surface; PeakForm Band and Trail Band sold separatelySport Band in the box, fitted with the Dynamic Lug System; Misty Band and Fabric Band sold separately
ColoursTitanium Silver, Titanium Grey40mm in Cream and Graphite; 44mm in Graphite and Silver
In the boxGalaxy Watch Ultra2, Marine Band, Fast Wireless ChargerGalaxy Watch9, Sport Band, Wireless Charger

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