Apple Watch Series 7 (45mm) vs Apple Watch Series 8 (45mm) Specs Comparison

Design

Dimensions
	1.77 x 1.50 x 0.42 inches 45 x 38 x 10.7 mm
Weight
1.34 oz (38.0 g)	1.37 oz (38.8 g)
Materials
Back: Aluminum	Back: Ceramic Frame: Aluminum
Resistance
Water, Dust; IP6X	Water, Dust; IP6X
Colors
Midnight, Starlight, Green, Blue, Red	Midnight, Starlight, Green, Blue, Red

Display

Size
	1.9-inch
Resolution
448x368px	484x396px, 329 PPI
Technology
OLED	OLED
Screen-to-body
	66.64 %
Peak brightness
	1000 cd/m2 (nit)

Hardware

System chip
Apple S7	Apple S8
Processor
Dual-core	Dual-core
GPU
PowerVR	PowerVR
Memory
1GB/32GB	1GB/32GB
Storage expansion
not expandable	not expandable
OS
watchOS (9.x, 8.x)	watchOS (9.x)

Battery

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

Camera

Connectivity & Features

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

Multimedia

Speakers
Loudspeaker	Loudspeaker
Additional microphone(s)
Yes	Yes

Cellular

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

Availability

Officially announced
Sep 14, 2021	Sep 07, 2022

Alternative variants

With Stainless Steel case

Weight	1.82 oz (51.5 g)
Materials	Back: Stainless steel

GPS Only

With titanium case

Weight	1.59 oz (45.1 g)
Materials	Back: Titanium

With stainless steel frame

Weight	1.82 oz (51.5 g)
Materials	Frame: Stainless steel

Links

Full specifications
Apple Watch Series 7 (45mm) Specs	Apple Watch Series 8 (45mm) Specs
PhoneArena Review
Apple Watch Series 7 (45mm) Review