Apple Watch Series 3 (38mm) vs Apple Watch Series 1 (38mm) Specs Comparison

Design

Dimensions
1.52 x 1.31 x 0.45 inches 38.6 x 33.3 x 11.4 mm	1.52 x 1.31 x 0.41 inches 38.6 x 33.3 x 10.5 mm
Weight
1.50 oz (42.4 g)	0.88 oz (25.0 g)
Materials
Back: Ceramic Frame: Stainless steel	Back: Plastic Frame: Aluminum
Resistance
Water, Dust	Yes; IPX7
Colors
Space Black, Silver	Silver, Gold, Rose Gold, Gray

Display

Size
1.5-inch, 55.12% screen-to-body	1.5-inch, 55.12% screen-to-body
Type
OLED, 1000 nits	OLED, 450 nits
Resolution
340x272px, 290 PPI	340x272px, 290 PPI
Protection
Sapphire
Features
Pressure-sensitive, Scratch-resistant glass	Pressure-sensitive, Ambient light sensor

Hardware

System chip
Apple S3	Apple S1P (28 nm)
Processor
Dual-core	Dual-core 520 MHz Cortex-A7
GPU
PowerVR	PowerVR G6200
Memory
768GB/16GB	0.5GB/8GB
Storage expansion
	not expandable
OS
watchOS (8.x, 7.x, 6.1, 6.x, 5.1, 5, 4.x)	watchOS (6.x, 5.1, 5, 4.x, 3.x)

Battery

Type
279 mAh	205 mAh
Charging
Qi wireless charging	Magnetic charging

Camera

Connectivity & Features

Bluetooth
4.2	4.0
WLAN
b,g,n 802.11 b, g, n	b,g,n 802.11 b, g, n
Sensors
Accelerometer, Gyroscope, Altimeter, Compass, Heart rate, Barometer	Accelerometer, Gyroscope, Heart rate, Ambient light sensor
Location
A-GPS, Glonass
Other
NFC	NFC

Multimedia

Headphones
No 3.5mm jack
Speakers
Loudspeaker	Loudspeaker

Cellular

4G (FDD) Bands
1, 3, 5, 7, 8, 18, 19, 20, 26
3G Bands
1, 5, 8
Data Speed
LTE, HSDPA+ (4G) 42.2 Mbit/s
SIM type
eSIM

Links

Full specifications
Apple Watch Series 3 (38mm) Specs	Apple Watch Series 1 (38mm) Specs
PhoneArena Review
Apple Watch Series 3 (38mm) Review