Apple Watch Series 4 (44mm) vs Apple Watch Series 9 (41mm) Specs Comparison

Design

Dimensions
1.73 x 1.50 x 0.42 inches 44.0 x 38.0 x 10.7 mm	1.61 x 1.38 x 0.42 inches 41 x 35 x 10.7 mm
Weight
1.29 oz (36.7 g)	1.49 oz (42.3 g)
Materials
Frame: Aluminum	Back: Ceramic Frame: Aluminum
Resistance
Water	Water, Dust; IP6X
Colors
Silver, Black	Midnight, Starlight, Green, Blue, Red

Display

Size
1.8-inch	1.7-inch
Resolution
448x368px, 326 PPI	430x352px, 329 PPI
Technology
OLED	OLED
Screen-to-body
59.89 %	63.01 %
Peak brightness
1000 cd/m2 (nit)	1000 cd/m2 (nit)
Features
Pressure-sensitive, Scratch-resistant glass (Sapphire), Ambient light sensor

Hardware

System chip
Apple S4 (7 nm)	Apple S9
Processor
Dual-core	Dual-core
GPU
Apple G11M	PowerVR
RAM
1GB	1GB
Internal storage
16GB	64GB
Storage expansion
not expandable	not expandable
OS
watchOS (9.x, 8.x, 7.x, 6.x, 5)	watchOS (10.x)

Battery

Capacity
292 mAh	282 mAh
Type
	Li - Ion
Charging
Magnetic charging	Qi wireless charging

Camera

Connectivity & Features

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

Multimedia

Speakers
Loudspeaker	Loudspeaker
Additional microphone(s)
Noise cancellation	Yes

Cellular

4G (FDD)
	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 66(AWS-3)
4G (TDD)
	Bands 39(1900+), 40(2300), 41(2600+)
3G
	Bands 1(2100), 2(1900), 4(1700/2100), 5(850)
Data Speed
LTE, HSPA	LTE, HSDPA+ (4G) 42.2 Mbit/s
SIM type
eSIM	eSIM

Availability

Officially announced
	Sep 12, 2023

Links

Full specifications
Apple Watch Series 4 (44mm) Specs	Apple Watch Series 9 (41mm) Specs
PhoneArena Review
	Apple Watch Series 9 (41mm) Review