Apple Watch Series 8 (45mm) vs Apple Watch Series 4 (40mm) 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.

Apple Watch Series 8 (45mm) Apple Watch Series 4 (40mm)
Released · Sep 07, 2022
Released · September 2018
1.9-inch · 484x396px
1.6-inch · 394x324px
1GB · 32GB
1GB · 16GB
308 mAh
225 mAh
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Availability

Officially announced
Sep 07, 2022

Design

Dimensions
1.77 x 1.50 x 0.42 inches
45 x 38 x 10.7 mm
1.57 x 1.34 x 0.42 inches
40.0 x 34.0 x 10.7 mm
Weight
1.37 oz / 38.8 g
Stainless steel frame - 51.5 g
1.06 oz / 30.1 g
Stainless steel case - 39.8 g
Materials
Back: Ceramic
Frame: Aluminum
Frame: Aluminum
Resistance
Water, Dust; IP6X Water
Colors
Midnight, Starlight, Green, Blue, Red Silver, Black

Display

Size
1.9-inch, 66.64% screen-to-body 1.6-inch, 57.48% screen-to-body
Type
OLED, 1000 nits OLED, 1000 nits
Resolution
484x396px, 329 PPI 394x324px, 325 PPI
Protection
Sapphire
Features
Pressure-sensitive, Scratch-resistant glass, Ambient light sensor

Hardware

System chip
Apple S8 Apple S4 (7 nm)
Processor
Dual-core Dual-core
GPU
PowerVR Apple G11M
Memory
1GB/32GB 1GB/16GB
Storage expansion
not expandable not expandable
OS
watchOS (9.x) watchOS (9.x, 8.x, 7.x, 6.x, 5)

Battery

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

Connectivity & Features

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

Multimedia

Speakers
Loudspeaker Loudspeaker
Additional microphone(s)
Yes Noise cancellation

Cellular

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

Alternative variants

GPS Only
With stainless steel case
Weight 1.40 oz / 39.8 g
Materials Frame: Stainless steel
With stainless steel frame
Weight 1.82 oz / 51.5 g
Materials Frame: Stainless steel
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