Xiaomi Redmi 9 vs Samsung Galaxy S21 Ultra Specs Comparison

Design

Dimensions
6.43 x 3.03 x 0.36 inches 163.32 x 77.01 x 9.1 mm	6.50 x 2.98 x 0.35 inches (~0.37 inches with camera bump) 165.1 x 75.6 x 8.9 mm (~9.4 mm with camera bump)
Weight
6.98 oz (198.0 g)	8.04 oz (229.0 g)
Materials
	Back: Glass (Corning Gorilla Glass Victus) Frame: Aluminum
Resistance
	Water, Dust; IP68
Biometrics
2D Face unlock, Fingerprint (touch)	2D Face unlock, Ultrasonic in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Carbon gray, Sunset purple, Ocean green	Phantom black, Silver

Display

Size
6.5-inch	6.8-inch
Resolution
2340x1080px, 19.5:9 ratio, 395 PPI	3200x1440px, 20:9 ratio, 516 PPI
Technology
IPS LCD	Dynamic AMOLED
Refresh rate
	120Hz (adaptable)
Screen-to-body
83.27 %	89.33 %
Peak brightness
	1500 cd/m2 (nit)
Features
Oleophobic coating, Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor	HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor

Hardware

System chip
MediaTek Helio G80 (12 nm)	Qualcomm Snapdragon 888 SM8350 (5 nm)
Processor
Octa-core 2000 MHz Arm Cortex-A75 and Arm Cortex-A55	Octa-core 1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680
GPU
Mali G52 MC2	Adreno 660
RAM
3GB (LPDDR4)	12GB (LPDDR5)
Internal storage
32GB (eMMC 5.1)	128GB (UFS 3.1)
Storage expansion
microSDXC	not expandable
OS
Android	Android (14, 13, 12, 11), One UI

Battery

Capacity
5020 mAh	5000 mAh
Type
	Li - Polymer
Charging
Qualcomm Quick Charge 3.0	Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging
Charge speed
Wired: 18.0W	Wired: 25.0W Wireless: 15.0W

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

9h 15min

Gaming

7h 3min

Battery Life Estimate

6h 15min

Browsing

14h 43min

Video

8h 52min

Gaming

8h 40min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Quad camera	Quad camera
Main camera
13 MP (PDAF) Aperture size: F2.2	108 MP (OIS, Laser and PDAF) Aperture size: F1.8 Focal length: 24 mm Sensor size: 1/1.33" Pixel size: 0.8 μm
Second camera
8 MP (Ultra-wide) Aperture size: F2.2	12 MP (Ultra-wide, PDAF) Aperture size: F2.2 Focal Length: 13 mm Sensor size: 1/2.55" Pixel size: 1.4 μm
Third camera
5 MP (Macro) Aperture size: F2.4	10 MP (Telephoto, OIS, PDAF) Optical zoom: 3.0x Aperture size: F2.4 Focal Length: 70 mm Sensor size: 1/3.2" Pixel size: 1.22 μm
Fourth camera
2 MP (Depth information)	10 MP (Telephoto, Periscope, OIS, PDAF) Optical zoom: 3.0x Aperture size: F2.4 Focal Length: 70 mm Sensor size: 1/3.2" Pixel size: 1.22 μm
Flash
LED	LED
Video recording
1920x1080 (Full HD)	7680x4320 (8K UHD) (24 fps), 3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (240 fps), 1280x720 (HD) (960 fps) OIS, HDR, Hyperlapse, Video light, EIS
Front
8 MP (HDR), Video capture: 1920x1080 (Full HD)	40 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)

Connectivity & Features

Bluetooth
5.0	5.1
WLAN
802.11 b,g,n Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,ax(Wi-Fi 6),dual-band MIMO, Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0	Type-C, USB 3.2
Hearing aid compatible
	M3/T3
Location
GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass	Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer
Other
NFC, Infrared	NFC, ANT+

Multimedia

Headphones
3.5mm jack	No 3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Multiple speakers
Features
	32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM	FM, Stereo, RDS
Additional microphone(s)
Noise cancellation	Noise cancellation, Video recording

Cellular

5G
	Bands n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave
4G (FDD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 20(800 DD), 28(700 APT)	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)
4G (TDD)
Bands 38(2600), 40(2300), 41(2600+)	Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 46, 48(3600)
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, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s	LTE-A Pro Cat 20 (2000/150 Mbit/s)
Dual SIM
Yes
SIM type
Nano SIM	Nano SIM
HD Voice
Yes
VoLTE
Yes

Regulatory Approval

FCC approval
	Date approved: Dec 22, 2020 FCC ID value: A3LSMG998U
Measured SAR
	Head: 0.77 W/kg Body: 1.02 W/kg Simultaneous Transmission: 1.59 W/kg Wireless Router: 1.16 W/kg Phablet: 3.15 W/kg

Buyers information

MSRP
	$ 1200 / € 1399
In The Box
10W Charger, TPU case, USB Type-C cable, SIM eject tool, Warranty card, User guide	C to C Data Cable, Ejection Pin

Availability

Officially announced
	Jan 14, 2021

Alternative variants

with 64GB storage

RAM	4GB
Internal storage	64GB

with 256GB storage

Internal storage	256GB
Colors	Phantom black
MSRP	$ 1250

with 512GB storage

RAM	16GB
Internal storage	512GB
Colors	Phantom black
MSRP	$ 1380

for Europe

System chip	Samsung Exynos 2100 (5 nm)
Processor	Octa-core 1x 2.91GHz Cortex-X1 + 3x 2.81GHz Cortex-A78 + 4x 2.2GHz Cortex-A55
GPU	Mali G78 MP14
Weight	8.01 oz (227.0 g)
5G	Bands SA, NSA, Sub-6
FCC approval	Date approved: Dec 22, 2020 FCC ID value: A3LSMG998B
Measured SAR	Head: 0.16 W/kg Body: 0.72 W/kg Simultaneous Transmission: 1.59 W/kg Wireless Router: 1.34 W/kg Phablet: 3.86 W/kg

Links

Full specifications
Xiaomi Redmi 9 Specs	Samsung Galaxy S21 Ultra Specs
PhoneArena Review
Xiaomi Redmi 9 Review	Samsung Galaxy S21 Ultra Review
User Reviews
Xiaomi Redmi 9 User Reviews	Samsung Galaxy S21 Ultra User Reviews