Apple Watch Ultra 4 49mm vs Apple Watch SE 2nd Gen (2022) 44mm

Bands n1, n2, n3, n5, n7, n8, n12, n14, n20, n25, n26, n28, n38, n40, n41, n53, n66, n71

Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 39, 40, 41, 53, 66, 71

Bands 1, 2, 3, 4, 5, 7, 12, 13, 17, 18, 19, 25, 26, 39, 40, 41, 66

Required to use smartwatch over cellular; rate plan required

Required to use smartwatch over cellular; rate plan required

Wi‑Fi 4 (802.11n)

802.11b/g/n

v5.3

v5.0

Electronic SIM

Electronic SIM

850/1700/1900/2100MHz

2.4GHz and 5GHz

Yes

Improved Workout app with new metrics, new views, and advanced ways to train.

Track a casual walk, an intense ride, and everything in between.

Satellite communications (Emergency SOS, Messages, Find My)

Emergency SOS

International emergency calling

Siren

Flashlight

Fall Detection

Crash Detection

Last Emergency Call Availability Waypoint

Noise monitoring

Backtrack

Generates an ECG similar to a single-lead electrocardiogram.

The most accurate heart rate sensing in a wearable, Series 12 now measures HRV as often as every five minutes for insights on stress and recovery, and takes background heart rate readings every five seconds.

Keep tabs on your resting, walking, and workout recovery heart rate.

Set workout-specific goals, see full summaries when you're done, and track how you're trending over time.

Health Sensing System: third-generation electrical heart sensor, always-on optical heart sensor, blood oxygen sensor, and temperature sensor

Depth gauge

Water temperature sensor

Compass

Always-on altimeter

High-g accelerometer

High dynamic range gyroscope

Ambient light sensor

Ambient light, accelerometer, barometric altimeter, built-in GPS, gyroscope, third-generation optical heart rate

Yes

Yes

Yes

Apple Music®

Apple Music®