realme X3 SuperZoom vs Samsung Galaxy S21 Ultra 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.

	9.1
realme X3 SuperZoom	Samsung Galaxy S21 Ultra
Released · Jun 02, 2020	Released · Jan 29, 2021
6.6-inch · 2400x1080px	6.8-inch · 3200x1440px
Quad camera	Quad camera
8GB · 128GB	12GB · 128GB
4200 mAh	5000 mAh
	Check prices

Design

Dimensions
6.45 x 2.98 x 0.35 inches 163.8 x 75.8 x 8.9 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
7.13 oz (202.0 g)	8.04 oz (229.0 g)
Materials
Back: Glass Frame: Plastic	Back: Glass (Corning Gorilla Glass Victus) Frame: Aluminum
Resistance
	Water, Dust; IP68
Biometrics
Fingerprint (touch)	2D Face unlock, Ultrasonic in-screen fingerprint
Keys
Left: Volume control; Right: Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Arctic white, Glacier blue	Phantom black, Silver

Display

Size
6.6-inch	6.8-inch
Resolution
2400x1080px, 20:9 ratio, 399 PPI	3200x1440px, 20:9 ratio, 516 PPI
Technology
IPS LCD	Dynamic AMOLED
Refresh rate
120Hz	120Hz (adaptable)
Screen-to-body
84.81 %	89.33 %
Peak brightness
	1500 cd/m2 (nit)
Features
Scratch-resistant glass (Corning Gorilla Glass 5), Ambient light sensor, Proximity sensor	HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 855+ SM8150-AC (7 nm)	Qualcomm Snapdragon 888 SM8350 (5 nm)
Processor
Octa-core Kryo 485	Octa-core 1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680
GPU
Adreno 640	Adreno 660
RAM
8GB (LPDDR4)	12GB (LPDDR5)
Internal storage
128GB (UFS 3.0)	128GB (UFS 3.1)
Storage expansion
not expandable	not expandable
OS
Android (10)	Android (14, 13, 12, 11), One UI

Battery

Capacity
4200 mAh	5000 mAh
Type
Li - Polymer	Li - Polymer
Charging
Fast charging	Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging
Charge speed
Wired: 30.0W	Wired: 25.0W Wireless: 15.0W

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

6h 15min

Browsing

14h 43min

Video

8h 52min

Gaming

8h 40min

Camera

Rear
Quad camera	Quad camera
Main camera
64 MP (PDAF) Aperture size: F1.8 Focal length: 26 mm Sensor size: 1/1.7" Pixel size: 0.8 μm	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: F2.3 Focal Length: 16 mm Sensor size: 1/4" Pixel size: 1.12 μm	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
8 MP (Telephoto, OIS, PDAF) Optical zoom: 5.0x Aperture size: F3.4 Focal Length: 124 mm	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 (Macro) Aperture size: F2.4 Pixel size: 1.75 μm	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
Dual LED	LED
Video recording
3840x2160 (4K UHD) (60 fps), 1920x1080 (Full HD) (60 fps), 1280x720 (HD) (960 fps) Time-lapse video, EIS	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
32 MP (Dual-Camera, EIS), 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 a,b,g,n,ac,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
Type-C, USB 2.0	Type-C, USB 3.2
Hearing aid compatible
	M3/T3
Location
GPS, A-GPS, Glonass, Galileo, Dual-band positioning, 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	NFC, ANT+

Multimedia

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

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
30W Dart Charger, USB Type-C Cable, Protect Case, Protect Film, SIM Card Tool, Important Info Booklet with Warranty Card, Quick Guide	C to C Data Cable, Ejection Pin

Availability

Officially announced
May 26, 2020	Jan 14, 2021

Alternative variants

with 256GB storage


RAM	12GB
Internal storage	256GB

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
realme X3 SuperZoom Specs	Samsung Galaxy S21 Ultra Specs
PhoneArena Review
	Samsung Galaxy S21 Ultra Review
User Reviews
	Samsung Galaxy S21 Ultra User Reviews