Apple Watch Series 4 (40mm) vs Apple Watch Series 9 (41mm) Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

9.0
Apple Watch Series 9 (41mm)
Apple Watch Series 4 (40mm) Apple Watch Series 9 (41mm)
Released · September 2018
Released · Sep 22, 2023
1.6-inch · 394x324px
1.7-inch · 430x352px
1GB · 16GB
1GB · 64GB
225 mAh
282 mAh

Availability

Officially announced
Sep 12, 2023

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) 1.49 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
1.6-inch, 57.48% screen-to-body 1.7-inch, 63.01% screen-to-body
Type
OLED, 1000 nits OLED, 1000 nits
Resolution
394x324px, 325 PPI 430x352px, 329 PPI
Protection
Sapphire
Features
Pressure-sensitive, Scratch-resistant glass, Ambient light sensor

Hardware

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

Battery

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

Camera

Connectivity & Features

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

Multimedia

Speakers
Loudspeaker Loudspeaker
Additional microphone(s)
Noise cancellation Yes

Cellular

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

Alternative variants

With stainless steel case
Weight 1.40 oz (39.8 g)
Materials Frame: Stainless steel
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