Xiaomi Redmi Note 4X vs Apple iPhone 12 vs Samsung Galaxy S21

Compare phone and tablet specifications of up to three devices at once.

Display

Size:

5.5 inches
6.1 inches
6.2 inches

Resolution:

1920 x 1080 pixels, 401 PPI
2532 x 1170 pixels, 19.5:9 ratio, 457 PPI
2400 x 1080 pixels, 20:9 ratio, 424 PPI

Technology:

IPS LCD
OLED
Dynamic AMOLED

Screen-to-body:

72.78 %
87.24 %
86.06 %

Colors:

16 777 216

Peak brightness:

1200 cd/m2 (nit)
1300 cd/m2 (nit)

Touchscreen:

Capacitive, Multi-touch

Features:

Ambient light sensor, Proximity sensor
60Hz refresh rate, HDR support, Oleophobic coating, Scratch-resistant glass (Ceramic Shield), Ambient light sensor, Proximity sensor
120Hz refresh rate (adaptive), HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor

Hardware

System chip:

Qualcomm Snapdragon 625 8953
Apple A14 Bionic
Qualcomm Snapdragon 888

Processor:

Octa-core, 2000 MHz, ARM Cortex-A53, 64-bit, 14 nm
Hexa-core, 3100 MHz, 64-bit, 5 nm
Octa-core, 2840 MHz, Kryo 680, 64-bit, 5 nm

GPU:

Adreno 506
Yes
Adreno 660

RAM:

3GB DDR3
4GB
8GB LPDDR5

Internal storage:

32GB
64GB (NVMe), not expandable
128GB (UFS 3.0), not expandable

Storage expansion:

microSDXC up to 128 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (6.0 Marshmallow)
iOS (14.x)
Android (11), Samsung One UI

Battery

Capacity:

4100 mAh
2815 mAh
4000 mAh

Type:

Li - Polymer, Not user replaceable
Li - Ion, Not user replaceable
Li - Polymer, Not user replaceable

Battery life test results:

Charging:

USB Power Delivery, Qi wireless charging, MagSafe wireless charging
Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging

Max charge speed:

Wireless: 15.0W
Wired: 25.0W; Wireless: 15.0W

Camera

Rear:

Single camera
Dual camera
Triple camera

Main camera:

13 MP (CMOS image sensor, PDAF)
12 MP (Sapphire crystal lens cover, OIS, PDAF)
12 MP (OIS, PDAF)

Specifications:

Aperture size: F2.0
Aperture size: F1.6; Focal length: 26 mm
Aperture size: F1.8; Focal length: 26 mm; Sensor size: 1/1.76"; Pixel size: 1.8 μm

Second camera:

12 MP (Ultra-wide, Sapphire crystal lens cover)
64 MP (Telephoto, OIS, PDAF)

Specifications:

Aperture size: F2.4; Focal Length: 13 mm
Aperture size: F2.0; Focal Length: 29 mm; Sensor size: 1/1.7"; Pixel size: 0.8 μm

Third camera:

12 MP (Ultra-wide, Autofocus)

Specifications:

Aperture size: F2.2; Focal Length: 13 mm; Sensor size: 1/2.55"; Pixel size: 1.4 μm

Video recording:

1920x1080 (Full HD) (30 fps), 1280x720 (HD) (120 fps)
3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps)
7680x4320 (8K UHD) (24 fps), 3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps)

Features:

Video calling, Video sharing
OIS, HDR, Time-lapse video, Continuous autofocus, Picture-taking during video recording
OIS, HDR, Hyperlapse, Continuous autofocus, Video light, EIS

Front:

5 MP
12 MP (EIS, HDR, Slow-motion videos)
10 MP (PDAF, HDR)

Video capture:

3840x2160 (4K UHD) (60 fps)
3840x2160 (4K UHD) (60 fps)

Design

Dimensions:

5.94 x 2.99 x 0.33 inches (151 x 76 x 8.45 mm)
5.78 x 2.81 x 0.29 inches (146.7 x 71.5 x 7.4 mm)
5.97 x 2.80 x 0.31 inches (151.7 x 71.2 x 7.9 mm)

Weight:

5.82 oz (165.0 g)
5.78 oz (164.0 g)
6.03 oz (171.0 g)

Materials:

Back: Metal
Back: Glass; Frame: Aluminum
Back: Plastic; Frame: Aluminum

Resistance:

Water, Dust; IP68
Water, Dust; IP68

Biometrics:

Fingerprint (touch)
3D Face unlock
2D Face unlock, Ultrasonic in-screen fingerprint

Features:

Touch sensitive control keys

Keys:

Right: Volume control, Lock/Unlock key
Left: Volume control, Other; Right: Lock/Unlock key
Right: Volume control, Lock/Unlock key

Colors:

Black, Gold, Gray, Pink, Green
Black, White, Red, Green, Blue
Phantom pink, Violet, Gray, White

Cellular

5G:

n1, n2, n3, n5, n7, n8, n12, n20, n25, n28, n38, n40, n41, n66, n71, n77, n78, n79, n260, n261, Sub-6, mmWave
n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave

LTE (FDD):

Bands 1(2100), 3(1800), 5(850), 7(2600)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 14(700 PS), 17(700 b), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 32(1500 L-band), 66(AWS-3), 71(600)
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), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 30(2300 WCS), 66(AWS-3), 71(600)

LTE (TDD):

Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
Bands 34(2000), 38(2600), 39(1900+), 40(2300), 41(2600+), 42(3500), 46, 48(3600)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46, 48(3600)

UMTS:

Bands 5(850), 8(900), 2(1900), 1(2100)
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 Cat 6 (300/50 Mbit/s), HSPA
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS

Dual SIM:

Shared with microSD
Yes

SIM type:

Nano SIM, Micro SIM
Nano SIM, eSIM
Nano SIM

HD Voice:

Yes
Yes

VoLTE:

Yes
Yes

Multimedia

Headphones:

3.5mm jack
No 3.5mm jack
No 3.5mm jack

Speakers:

Earpiece, Loudspeaker
Earpiece, Multiple speakers
Earpiece, Multiple speakers

Features:

Album art cover, Background playback
Dolby Atmos
32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM, Stereo, RDS

Additional microphone(s):

for Noise cancellation
for Noise cancellation
for Noise cancellation, Video recording

Connectivity & Features

Bluetooth:

4.2
5.0
5.0

Wi-Fi:

802.11 a, b, g, n, dual-band; Hotspot, Wi-Fi Direct
802.11 a, b, g, n, ac, ax (Wi-Fi 6), dual-band; MIMO, Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, ax (Wi-Fi 6), dual-band; MIMO, Wi-Fi Direct, Hotspot

USB:

microUSB, USB 2.0
Lightning
Type-C (reversible), USB 3.2

Features:

Mass storage device, Charging
Charging, Headphones port
Charging, Headphones port, OTG, Video out

Location:

GPS, A-GPS, Glonass, BeiDou
GPS, A-GPS, Glonass, Galileo, BeiDou, QZSS, Cell ID, Wi-Fi positioning
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning

Sensors:

Accelerometer, Gyroscope, Hall (for flip covers)
Accelerometer, Gyroscope, Compass, Barometer
Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer

Other:

Infrared, VoIP, Tethering, Computer sync, OTA sync
NFC, UMA (Wi-Fi Calling)
NFC, ANT+

Hearing aid compatible:

M3, T4
M3, T3

Phone features

Notifications:

Haptic feedback

Other features:

Voice dialing, Voice commands, Voice recording

Regulatory Approval

FCC approval:

Date approved:

Dec 08, 2020

FCC ID value:

A3LSMG991U link

Measured SAR:

Head:

0.36 W/kg

Body:

1.08 W/kg

Simultaneous Transmission:

3.96 W/kg

Wireless Router:

1.09 W/kg

Phablet:

2.49 W/kg

Buyers information

Price:

$ 145
$ 829
$ 800

In The Box:

USB-C to Lightning Cable, Documentation
C to C Data Cable, Ejection Pin

Availability

Officially announced:

Feb 08, 2017
Oct 13, 2020
Jan 14, 2021
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