vivo X21 vs Xiaomi Mi A3 Specs Comparison

Design

Dimensions
6.08 x 2.94 x 0.29 inches 154.45 x 74.78 x 7.37 mm	6.04 x 2.83 x 0.33 inches 153.48 x 71.85 x 8.475 mm
Weight
5.51 oz (156.2 g)	6.13 oz (173.8 g)
Materials
Back: Aluminum Frame: Aluminum	Back: Glass (Corning Gorilla Glass 5) Frame: Plastic
Biometrics
2D Face unlock, Optical in-screen fingerprint	2D Face unlock, Optical in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key	Back: Volume control, Lock/Unlock key
Colors
Black	Gray, Blue, White

Display

Size
6.3-inch	6.1-inch
Resolution
2280x1080px, 402 PPI	1560x720px, 19.5:9 ratio, 282 PPI
Technology
Super AMOLED	Super AMOLED
Screen-to-body
85.36 %	82.56 %
Features
Ambient light sensor, Proximity sensor	Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 660 SDM660 (14 nm)	Qualcomm Snapdragon 665 (11 nm)
Processor
Octa-core 2200 MHz Kryo 260	Octa-core 2000 MHz Kryo 260
GPU
Adreno 512	Adreno 610
RAM
6GB (LPDDR4)	4GB (LPDDR4)
Internal storage
128GB	128GB
Storage expansion
microSDXC up to 256 GB	microSDXC up to 256 GB
OS
Android (8.1 Oreo), Funtouch UI	Android (11, 10, 9.0 Pie)

Battery

Capacity
3200 mAh	4030 mAh
Type
Li - Ion
Charging
Fast charging	Qualcomm Quick Charge 3.0

Camera

Rear
Dual camera	Triple camera
Main camera
12 MP (PDAF) Aperture size: F1.8 Sensor size: 1/2.8" Pixel size: 1.28 μm	48 MP (PDAF) Aperture size: F1.8 Sensor size: 1/2.3" Pixel size: 0.8 μm
Second camera
5 MP (Depth information) Aperture size: F2.4	8 MP (Ultra-wide) Aperture size: F2.2 Pixel size: 1.12 μm
Third camera
	2 MP (Depth information) Aperture size: F2.4
Flash
LED	LED
Video recording
1920x1080 (Full HD) (30 fps) Time-lapse video, Video calling, Video sharing	3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps) EIS, Video calling, Video sharing
Front
12 MP, Video capture: 1920x1080 (Full HD)	32 MP, Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot
USB
microUSB, USB 2.0	Type-C
Location
GPS, A-GPS, Glonass	GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass	Accelerometer, Gyroscope, Compass
Other
VoIP, Tethering, Computer sync, OTA sync	Infrared, VoIP, Tethering, Computer sync, OTA sync

Multimedia

Headphones
3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Features
Album art cover, Background playback	Album art cover, Background playback
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM	FM
Additional microphone(s)
Noise cancellation	Noise cancellation

Cellular

4G (FDD)
Bands 1(2100), 3(1800), 5(850)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)
4G (TDD)
Bands 40(2300), 41(2600+)	Bands 38(2600), 40(2300)
3G
Bands 5(850), 8(900), 1(2100)	Bands 5(850), 8(900), 4(1700/2100), 2(1900), 1(2100)
Data Speed
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s	LTE-A Cat 9 (450/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
Dual SIM
Yes	Yes
SIM type
Nano SIM	Nano SIM

Regulatory Approval

Measured SAR
Head: 1.18 W/kg Body: 0.57 W/kg

Buyers information

In The Box
Earphone, Documentation, microUSB cable, USB Power Adapter, SIM Ejector, Protective Case, Protective Film (applied)	10W charger, USB Type-C cable, SIM eject tool, User guide, Soft case, Warranty card

Availability

Officially announced
	Jul 17, 2019

Alternative variants

with 64 GB storage

Internal storage	64GB

Links

Full specifications
vivo X21 Specs	Xiaomi Mi A3 Specs