Xiaomi Mi 8 vs Samsung Galaxy A51 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.

	7.0
Xiaomi Mi 8	Samsung Galaxy A51
Released · Jun 05, 2018	Released · Dec 27, 2019
6.2-inch	6.5-inch
Dual camera	Quad camera
6GB · 256GB	4GB · 128GB
3400 mAh	4000 mAh
	Check prices

Design

Dimensions
6.10 x 2.94 x 0.30 inches 154.9 x 74.8 x 7.6 mm	6.24 x 2.90 x 0.31 inches 158.5 x 73.6 x 7.9 mm
Weight
6.17 oz (175.0 g)	6.07 oz (172.0 g)
Materials
Back: Glass (Corning Gorilla Glass 5)	Back: Plastic Frame: Plastic
Biometrics
2D Face unlock, Fingerprint (touch)	2D Face unlock, Optical in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Black, Gold, Blue, White	Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue

Display

Size
6.2-inch	6.5-inch
Resolution
2248x1080px, 402 PPI	2400x1080px, 20:9 ratio, 405 PPI
Technology
AMOLED	Super AMOLED
Refresh rate
	60Hz
Screen-to-body
83.66 %	87.37 %
Peak brightness
600 cd/m2 (nit)
Features
HDR support, Pressure-sensitive, Oleophobic coating, Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor	Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 845 SDM845 (10 nm)	Samsung Exynos 9611 (10 nm)
Processor
Octa-core 2800 MHz Kryo 385	Octa-core 2300 MHz 4x 2.3GHz Cortex-A73 + 4x 1.7GHz Cortex-A53
GPU
Adreno 630	Mali-G72 MP3
RAM
6GB (LPDDR4)	4GB (LPDDR4)
Internal storage
256GB	128GB, available to use: 105.9 GB
Storage expansion
	microSDXC up to 512 GB
OS
Android (10, 9.0 Pie, 8.0 Oreo)	Android (11, 10), Samsung One UI

Battery

Capacity
3400 mAh	4000 mAh
Type
Li - Polymer	Li - Polymer
Charging
Qualcomm Quick Charge 4+	Fast charging

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

5h 22min

Browsing

11h 35min

Video

8h 35min

Gaming

6h 40min

Camera

Rear
Dual camera	Quad camera
Main camera
12 MP (OIS, PDAF) Aperture size: F1.8 Sensor size: 1/2.55" Pixel size: 1.4 μm	48 MP (PDAF) Aperture size: F2.0 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm
Second camera
12 MP (Telephoto, Autofocus) Optical zoom: 2.0x Aperture size: F2.4 Focal Length: 56 mm Sensor size: 1/3.4" Pixel size: 1 μm	12 MP (Ultra-wide) Aperture size: F2.2 Focal Length: 13 mm Pixel size: 1.12 μm
Third camera
	5 MP (Macro) Aperture size: F2.4 Focal Length: 40 mm
Fourth camera
	5 MP (Depth information) Aperture size: F2.2 Sensor size: 1/5" Pixel size: 1.12 μm
Flash
LED	LED
Video recording
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps) Video calling, Video sharing	3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps) Hyperlapse, EIS
Front
20 MP (HDR)	32 MP (HDR), Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
802.11 a,b,g,n,ac,dual-band MIMO, Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot
USB
Type-C	Type-C, USB 2.0
Location
GPS, A-GPS, Glonass, BeiDou	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer	Accelerometer, Gyroscope, Compass, Hall (for flip covers)
Other
NFC, VoIP, Tethering, Computer sync, OTA sync	NFC, ANT+

Multimedia

Headphones
No 3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Features
Album art cover, Background playback	Dolby Atmos
Screen mirroring
Wireless screen share	Wireless screen share
Radio
	FM
Additional microphone(s)
Noise cancellation	Noise cancellation

Cellular

4G (FDD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 17(700 b), 20(800 DD)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
4G (TDD)
Bands 34(2000), 38(2600), 39(1900+), 40(2300), 41(2600+)	Bands 38(2600), 39(1900+), 41(2600+)
3G
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)	Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A Pro Cat 16 (1000/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS	LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM
Yes
SIM type
Nano SIM	Nano SIM
HD Voice
Yes
VoLTE
Yes

Regulatory Approval

FCC approval
	Date approved: Nov 28, 2019 FCC ID value: A3LSMA515FN
Measured SAR
	Head: 0.89 W/kg Body: 1.18 W/kg Simultaneous Transmission: 1.56 W/kg Wireless Router: 1.12 W/kg Phablet: 2.76 W/kg

Buyers information

MSRP
	$ 400
In The Box
Mi 8 Protective cover / Power adapter / USB Type-C cable / Type-C to audio converter / SIM insertion tool / User guide

Availability

Officially announced
May 31, 2018	Dec 12, 2019

Alternative variants

with 64 GB storage


Internal storage	64GB

with 128GB storage


RAM	6GB
Internal storage	128GB

with 128 GB storage


Internal storage	128GB

for Verizon


4G (FDD)	Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 13(700 c), 20(800 DD), 28(700 APT), 66(AWS-3)
3G	Bands 5(850), 8(900), 2(1900), 1(2100)


RAM	8GB
Internal storage	128GB
Capacity	3000 mAh
Weight	6.24 oz (177.0 g)
Biometrics	Optical in-screen fingerprint

for AT&T


4G (FDD)	Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

for Sprint


4G (FDD)	Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

for Europe


4G (FDD)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 20(800 DD), 26(850+), 28(700 APT), 66(AWS-3)
4G (TDD)	Bands 38(2600), 40(2300), 41(2600+)
Dual SIM	Yes

Links

Full specifications
Xiaomi Mi 8 Specs	Samsung Galaxy A51 Specs
PhoneArena Review
	Samsung Galaxy A51 Review
User Reviews
	Samsung Galaxy A51 User Reviews