Apple Watch Ultra 3 / Google Pixel Watch 4 (41 mm, Wi-Fi)

Ultra 3 is sold only as a 49 mm GPS + Cellular watch; bands fit 130–210 mm wrists.

Apple says the wide-angle OLED pixels emit light at wider angles, so the screen stays readable without fully turning the wrist. LTPO3 allows thinner borders and lets the always-on mode refresh once per second, so a seconds hand is visible without raising the wrist. The 1-nit minimum reduces glare in the dark.

GIGAZINE gives the 41 mm model's resolution as 426 × 426.

RedCap is a reduced form of 5G for low-data devices such as watches. Satellite connectivity lets you call for emergency help and send short messages outside cellular coverage; Apple says Find My shares location via satellite every 15 minutes. Satellite services are free for two years from activation; Find My and Messages need a carrier plan, and availability varies by region.

Using L1 and L5 together helps reduce reflected-signal errors near tall buildings and under tree cover. Ultra Wideband availability varies by region.

The electrical heart sensor powers the ECG app; the optical sensor drives heart rate and Apple’s hypertension notifications. Hypertension notifications passively analyse 30-day periods and are not intended for people under 22, during pregnancy or for those already diagnosed. The temperature sensor is not for medical use; the Blood Oxygen app is for wellness use.

ECG and some health features may be limited by country; readings are not a medical diagnosis.

Diving needs a compatible third-party app; the depth gauge is accurate to ±1 m. MIL-STD 810H covers altitude, high/low temperature, temperature shock, immersion, freeze/thaw, ice and freezing rain, shock and vibration. Passing these tests does not mean the watch cannot be damaged.

5 ATM suits shallow-water activities like swimming, not diving or high-speed water sports.

Apple says 15 minutes of charging gives 12 hours of normal use and 5 minutes gives 8 hours of sleep tracking. Apple’s 80% in 45 minutes figure is based on its 20 W USB-C power adapter. Low Power Mode is rated at 20 hours of continuous outdoor workout with full GPS and heart rate.

The siren helps people nearby locate a user who is lost or needs help.

The watch does not pair with Android phones; setup and most features require an iPhone.

The 45 mm model weighs 36.7 g.

The ability to drop to 1 Hz reduces the battery cost of the always-on display.

The co-processor handles notifications and sensor work while the screen is off without waking the main processor, saving battery.

The 45 mm model has a 455 mAh battery and up to 40 hours with the always-on display.

The watch sits in a new side-mounted dock; earlier Pixel Watch chargers do not fit this model.

This entry covers the Wi-Fi model; LTE and UMTS cellular connectivity is only on the LTE model.

Some features depend on the phone's Android version and the Pixel Watch app.