Apple Watch Ultra 3 vs Apple Watch Ultra 2

Apple announced Ultra 2 on 12 September 2023 and Ultra 3 on 9 September 2025, and they reached stores on 22 September 2023 and 19 September 2025, both at $799. Two years on, they’re hard to tell apart on a wrist. A black Ultra 2 and a black Ultra 3 even weigh the same: 61.8 grams without a band.

Ultra 3 and Ultra 2 side by side

Spec	Apple Watch Ultra 3	Apple Watch Ultra 2
Announced	9 September 2025	12 September 2023
Case	49 × 44 × 12mm Grade 5 titanium	Same
Weight	61.6 g natural; 61.8 g black	61.4 g natural; 61.8 g black
Display	LTPO3, 422 × 514, 1,245 sq mm	LTPO2, 410 × 502, 1,185 sq mm
Brightness	Up to 3,000 nits; 1 nit minimum	Same
Always On	Updates once a second (1Hz)	About once a minute
Chip / storage	S10; 64GB	S9; 64GB
Normal use	Up to 42 hours	Up to 36 hours
Low Power Mode	Up to 72 hours	Up to 72 hours
GPS workouts	Not published	Not published
Charging	About 80% in 45 minutes	About 80% in 1 hour
Cellular	5G and LTE (model A3281)	LTE and UMTS
Satellite	SOS, Messages, Find My	No
Sleep	Stages, Sleep score, sleep apnea notifications	Stages, sleep apnea notifications
Hypertension notifications	Yes, with limits	Not listed
Gestures	Double tap, wrist flick	Double tap
iPhone needed	iPhone 11 or later, iOS 26 at launch	iPhone Xs or later, iOS 18
US launch price	$799	$799

Satellite is the reason Ultra 3 exists

If you go beyond cell coverage, this is the whole decision. Ultra 3 can send Emergency SOS, Messages and Find My over satellite. Ultra 2 has no satellite radio.

The rest of the radio story is smaller. Ultra 3 (model A3281) has 5G and LTE with international roaming, where Ultra 2 has LTE and UMTS. Both have L1 and L5 dual-frequency GPS covering GPS, GLONASS, Galileo, QZSS and BeiDou, which Apple has called the most accurate GPS in a sports watch; that’s its claim. Wi-Fi 4, Bluetooth 5.3 and a second-generation ultra-wideband chip are on both.

Both have a siren, dual speakers, a three-microphone array and an Action Button that can start a workout with Precision Start. Ultra 3 also lists a flashlight among its safety features. Ultra 2 has double tap and on-device Siri; Ultra 3 adds wrist flick to double tap.

Battery and charging

Apple rates Ultra 2 for up to 36 hours, on a test day that includes time checks, notifications, a 60-minute workout with music and some LTE. Ultra 3 is rated for 42, and both reach 72 hours in Low Power Mode.

The bigger day-to-day gain is charging. Ultra 3 gets to about 80% in 45 minutes against about an hour, 15 minutes buys about 12 hours of normal use, and five minutes buys about eight hours of sleep tracking.

Neither watch has a GPS workout rating. Max Extended Workout, rated for 45 hours, arrived with Ultra 4, so a seller quoting it for Ultra 3 is describing the newer watch. Each box has the watch, one band and a Magnetic Fast Charger to USB-C cable.

Same peak brightness, faster Always On

Brightness is a tie: up to 3,000 nits, down to 1 nit, at 326 pixels per inch on both. Ultra 3’s LTPO3 panel, with wide-angle OLEDs, is a little bigger: 422 × 514 pixels over 1,245 square millimeters, against 410 × 502 and 1,185 on Ultra 2’s LTPO2.

Always On is the difference you’ll see. Ultra 3 refreshes the dimmed face once a second, so a seconds hand keeps ticking with your wrist down; Ultra 2 updates it about once a minute. Night Mode covers the Modular Ultra and Wayfinder faces on both, and Ultra 3 adds Orienteering.

Health: the same sensors, two additions

Both use a third-generation optical heart sensor and an electrical sensor for the ECG app, with region and age limits, plus Blood Oxygen as a wellness feature, a wrist temperature sensor and a separate water-temperature sensor. Ultra 2 tracks sleep stages and offers sleep apnea notifications for ages 18 and up.

Ultra 3 adds a Sleep score and hypertension notifications, which come with region, age and pregnancy limits. None of these features is a diagnosis.

What carries over

The case is 49 by 44 by 12mm Grade 5 titanium on both, with a sapphire front, in natural or black, for wrists from 130 to 210mm; Apple says Ultra 3’s case titanium is recycled. Natural titanium went from 61.4 to 61.6 grams, which you won’t notice.

Both are water resistant to 100 meters and certified to EN13319 for recreational scuba to 40 meters, with a depth gauge accurate to about 1 meter, a water-temperature sensor and an App Store dive computer that opens automatically at around 1 meter. Ultra 3 also uses GPS to mark where you entered and left the water. Both are IP6X and tested to MIL-STD-810H methods for altitude, temperature, immersion, freeze and thaw, shock and vibration, and both work on the wrist from minus 20 to 55 degrees Celsius.

Workouts match: running, hiking, cycling, swimming and diving, plus skiing, snowboarding, rowing, paddling and golf. Runs show cadence, stride, ground contact time, vertical oscillation and power. Hiking gets the compass, Backtrack, offline maps, U.S. topographic maps and curated hikes in 63 U.S. national parks; cycling supports a Bluetooth power meter, and swimming shows SWOLF and water temperature.

Software and your iPhone

Both get watchOS 27, which supports Ultra 2 or later and needs iOS 27 on the iPhone. Ultra 3 launched on watchOS 26 and works with an iPhone 11 or later on iOS 26 or later. Ultra 2 works with an iPhone Xs or later, including iPhone SE (2nd generation), on iOS 18 or later.

What they cost

Both started at $799, Ultra 2 in September 2023 and Ultra 3 in September 2025. Ultra 3 is now the previous Ultra, after Ultra 4, and neither launch price tells you what a seller charges today. Paying more for Ultra 3 gets you satellite, 5G, six more hours, faster charging and the LTPO3 screen; it doesn’t get you a new case size or Ultra 4’s heart sensors. Compare what sellers are asking for each before you buy.