Apple Watch Series 9 (41mm) vs Apple Watch SE 3 (40mm) Specs Comparison

Availability

Officially announced
Sep 12, 2023	Sep 09, 2025
Prices (MSRP)
	$249

Design

Dimensions
1.61 x 1.38 x 0.42 inches 41 x 35 x 10.7 mm	1.57 x 1.34 x 0.42 inches 40 x 34 x 10.7 mm
Weight
1.49 oz / 42.3 g	0.93 oz / 26.4 g
Materials
Back: Ceramic Frame: Aluminum
Resistance
Water, Dust; IP6X	Water (up to 50 meters)
Colors
Midnight, Starlight, Green, Blue, Red	Starlight, Midnight

Display

Size
1.7-inch, 63.01% screen-to-body	1.6-inch, 57.48% screen-to-body
Type
OLED, 1000 nits	OLED, 1000 nits
Resolution
430x352px, 329 PPI	394x324px, 325 PPI
Features
	Pressure-sensitive, Scratch-resistant glass, Ambient light sensor

Hardware

System chip
Apple S9	Apple S10
Processor
Dual-core	Dual-core
GPU
PowerVR	PowerVR
Memory
1GB/64GB	1GB/64GB
Storage expansion
not expandable	not expandable
OS
watchOS (10.x)	watchOS (9.x, 8.x, 7.x)

Battery

Type
282 mAh, Li - Ion	Li - Ion
Charging
Qi wireless charging	Magnetic charging

Connectivity & Features

Bluetooth
Yes	5.3
WLAN
b,g,n 802.11 b, g, n	a,b,g,n,ac 802.11 b, g, n
Sensors
Accelerometer, Gyroscope, Altimeter, Compass, Heart rate, Thermometer, Barometer, ECG, Blood Oxygen	Accelerometer, Gyroscope, Altimeter, Compass, Heart rate, Barometer, Ambient light sensor
Location
A-GPS, Glonass, Galileo, BeiDou, QZSS	GPS, Glonass
Other
NFC, Ultra Wideband (UWB)	NFC

Multimedia

Speakers
Loudspeaker	Loudspeaker
Additional microphone(s)
Yes

Cellular

5G Bands
	5G Ready
4G (FDD) Bands
1, 2, 3, 4, 5, 7, 8, 18, 19, 20, 25, 26, 28, 66	1, 2, 3, 4, 5, 7, 12, 13, 17, 18, 19, 25, 26, 66
4G (TDD) Bands
39, 40, 41	39, 40, 41
3G Bands
1, 2, 4, 5	1, 2, 4, 5
Data Speed
LTE, HSDPA+ (4G) 42.2 Mbit/s	LTE, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
SIM type
eSIM	eSIM

Links

Full specifications
Apple Watch Series 9 (41mm) Specs	Apple Watch SE 3 (40mm) Specs
PhoneArena Review
Apple Watch Series 9 (41mm) Review