Apple Watch Series 4 (40mm) vs Apple Watch Series 9 (45mm) Specs Comparison

Compare phone and tablet specifications of up to three devices at once.

Display

Size:

1.6 inches
1.7 inches

Resolution:

394 x 324 pixels, 325 PPI
430 x 352 pixels, 329 PPI

Technology:

OLED
OLED

Screen-to-body:

57.48 %
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, not expandable
64GB, not expandable

OS:

watchOS (9.x, 8.x, 7.x, 6.x, 5)
watchOS (10.x)

Device type:

Smartwatch
Smartwatch

Battery

Capacity:

225 mAh
308 mAh

Type:

Not user replaceable
Li - Ion, Not user replaceable

Charging:

Magnetic charging
Qi wireless charging

Camera

Rear:

Design

Dimensions:

1.57 x 1.34 x 0.42 inches (40.0 x 34.0 x 10.7 mm)
1.61 x 1.38 x 0.42 inches (41 x 35 x 10.7 mm)

Weight:

1.06 oz (30.1 g)
1.82 oz (51.5 g)

Materials:

Frame: Aluminum
Back: Ceramic; Frame: Aluminum

Resistance:

Water
Water, Dust; IP6X

Colors:

Silver, Black
Midnight, Starlight, Green, Blue, Red

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

Multimedia

Speakers:

Loudspeaker
Loudspeaker

Additional microphone(s):

for Noise cancellation
Yes

Connectivity & Features

Bluetooth:

5.0
Yes

Wi-Fi:

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)

Availability

Officially announced:

Yes
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