Samsung Galaxy S25 Ultra vs Asus ROG Phone 9 Pro vs Samsung Galaxy S21 Ultra Specs Comparison

Display

Size
6.9-inch	6.8-inch	6.8-inch
Resolution
3120 x 1440 px, 19.5:9 ratio, 498 PPI	2400 x 1080 px, 20:9 ratio, 388 PPI	3200 x 1440 px, 20:9 ratio, 516 PPI
Technology
Dynamic AMOLED	OLED	Dynamic AMOLED
Refresh rate
120Hz	185Hz	120Hz (adaptable)
Screen-to-body
90.30 %	88.31 %	89.33 %
Peak brightness
2600 cd/m2 (nit)	2500 cd/m2 (nit)	1500 cd/m2 (nit)
Features
HDR support, Scratch-resistant glass (Corning Gorilla Glass Armor 2), Ambient light sensor, Proximity sensor	HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus 2), Ambient light sensor, Proximity sensor	HDR support, Scratch-resistant glass (Corning Gorilla Glass Victus), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 8 Elite for Galaxy SM8750-AB (3 nm)	Snapdragon 8 Elite SM8750-AB (3 nm)	Qualcomm Snapdragon 888 SM8350 (5 nm)
Processor
Octa-core, 2x 4.47GHz Oryon V2 Phoenix L + 6x 3.53GHz Oryon V2 Phoenix M, 64-bit	Octa-core, 2x 4.32GHz Prime cores + 6x 3.53GHz Performance core	Octa-core, 1x 2.84GHz Kryo 680 + 3x 2.42GHz Kryo 680 + 4x 1.80GHz Kryo 680, 64-bit
GPU
Adreno 830	Adreno 830	Adreno 660
RAM
12GB (LPDDR5X)	16GB (LPDDR5X)	12GB (LPDDR5)
Internal storage
256GB (UFS 4.0), not expandable	512GB (UFS 4.0)	128GB (UFS 3.1), not expandable
OS
Android (15), One UI	Android (15)	Android (14, 13, 12, 11), One UI
Device type
Smartphone	Smartphone	Smartphone

Battery

Capacity
5000 mAh	5800 mAh	5000 mAh
Type
Li - Ion, Not user replaceable	Not user replaceable	Li - Polymer, Not user replaceable
Charging
Fast charging, Qi wireless charging, Reverse wireless charging	Fast charging, Qi wireless charging, Reverse wired charging	Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging, Qi and Powermat wireless charging, Reverse wireless charging
Max charge speed
Wired: 45.0W Wireless: 15.0W	Wired: 65.0W Wireless: 15.0W	Wired: 25.0W Wireless: 15.0W

PhoneArena Battery Tests

Battery Life Estimate

8h 0min

Browsing

20h 49min

Video

8h 54min

Gaming

14h 21min

Battery Life Estimate

8h 37min

Browsing

18h 25min

Video

12h 41min

Gaming

13h 41min

Battery Life Estimate

6h 15min

Browsing

14h 43min

Video

8h 52min

Gaming

8h 40min

Find out more details about battery and charging for all phones we have tested on our PhoneArena Battery Score page.

Camera

Rear
Quad camera	Triple camera	Quad camera
Main camera
200 MP (OIS, Laser and PDAF) Specifications: Aperture size: F1.7 Focal length: 24 mm Sensor size: 1/1.3" Pixel size: 0.6 μm	50 MP (OIS, PDAF) Specifications: Sensor size: 1/1.56"	108 MP (OIS, Laser and PDAF) Specifications: Aperture size: F1.8 Focal length: 24 mm Sensor size: 1/1.33" Pixel size: 0.8 μm
Second camera
50 MP (Telephoto, Periscope, OIS, PDAF) Specifications: Optical zoom: 5.0x Aperture size: F3.4 Focal Length: 111 mm Sensor size: 1/2.52" Pixel size: 0.7 μm	32 MP (Telephoto, OIS) Specifications: Optical zoom: 3.0x	10 MP (Telephoto, Periscope, OIS, PDAF) Specifications: Optical zoom: 10.0x Aperture size: F4.9 Focal Length: 240 mm Sensor size: 1/3.2" Pixel size: 1.22 μm
Third camera
10 MP (Telephoto, OIS, PDAF) Specifications: Optical zoom: 3.0x Aperture size: F2.4 Focal Length: 67 mm Sensor size: 1/3.52" Pixel size: 1.12 μm	13 MP (Ultra-wide)	10 MP (Telephoto, OIS, PDAF) Specifications: Optical zoom: 3.0x Aperture size: F2.4 Focal Length: 70 mm Sensor size: 1/3.2" Pixel size: 1.22 μm
Fourth camera
50 MP (Ultra-wide, PDAF) Specifications: Aperture size: F1.9 Pixel size: 0.7 μm		12 MP (Ultra-wide, PDAF) Specifications: Aperture size: F2.2 Focal Length: 13 mm Sensor size: 1/2.55" Pixel size: 1.4 μm
Flash
LED	LED	LED
Video recording
7680x4320 (8K UHD) (30 fps), 3840x2160 (4K UHD) (120 fps), 1920x1080 (Full HD) (240 fps) Features: HDR, Continuous autofocus, Picture-taking during video recording	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: OIS, HDR, Hyperlapse, Video light, EIS
Front
12 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)	32 MP, Video capture: 1920x1080 (Full HD)	40 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)

PhoneArena Camera Tests

158

Overall

165

Photo

150

Video

138

Overall

138

Photo

137

Video

N/A

Overall

N/A

Photo

N/A

Video

Find out more details about photo and video scores for all phones we have tested on our PhoneArena Camera Score page.

Design

Dimensions
6.41 x 3.06 x 0.32 inches (162.8 x 77.6 x 8.2 mm) thickness with camera 0.36 inches (9.1 mm)	6.45 x 3.02 x 0.35 inches (163.8 x 76.8 x 8.9 mm)	6.50 x 2.98 x 0.35 inches (165.1 x 75.6 x 8.9 mm) thickness with camera 0.37 inches (9.4 mm)
Weight
7.69 oz(218.0 g)	8.01 oz(227.0 g)	8.04 oz(229.0 g)
Materials
Back: Glass (Corning Gorilla Glass Armor 2) Frame: Titanium	Back: Glass Frame: Aluminum	Back: Glass (Corning Gorilla Glass Victus) Frame: Aluminum
Resistance
Water, Dust; IP68	Water, Dust; IP68	Water, Dust; IP68
Biometrics
Ultrasonic in-screen fingerprint	Optical in-screen fingerprint	2D Face unlock, Ultrasonic in-screen fingerprint
Features
Stylus	Dedicated game buttons
Keys
Right: Volume control, Lock/Unlock key		Right: Volume control, Lock/Unlock key
Colors
Titanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray		Phantom black, Silver

Cellular

5G
Bands n1, n2, n5, n7, n25, n28, n41, n66, n71, n77, n78, n257, n258, n260, n261, SA, NSA, Sub-6, mmWave	Bands n1, n2, n3, n5, n7, n8, n12, n20, n25, n28, n29, n38, n40, n41, n48, n66, n71, n77, n78, n79, SA, NSA, Sub-6	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), 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), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 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)
4G (TDD)
Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 48(3600)	Bands 34(2000), 38(2600), 39(1900+), 41(2600+), 42(3500), 48(3600)	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), 6(800), 8(900)	Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A Pro Cat 20 (2000/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s	LTE-A, HSDPA+ (4G) 42.2 Mbit/s	LTE-A Pro Cat 20 (2000/150 Mbit/s)
SIM type
Nano SIM, eSIM	Dual Nano SIM	Nano SIM

Multimedia

Headphones
No 3.5mm jack	3.5mm jack	No 3.5mm jack
Speakers
Earpiece, Multiple speakers	Earpiece, Multiple speakers	Earpiece, Multiple speakers
Features
aptX, aptX-HD		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)
Noise cancellation	Noise cancellation	Noise cancellation, Video recording

Connectivity & Features

Bluetooth
5.4	5.3	5.1
Wi-Fi
802.11 a,b,g,n,ac,ax(Wi-Fi 6),Wi-Fi 6E,Wi-Fi 7 Wi-Fi Direct, Hotspot	802.11 b,g,n,ac,ax(Wi-Fi 6),Wi-Fi 7,Wi-Fi 6E 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 (reversible), USB 3.2, Features: Charging, OTG	Type-C (reversible), Features: Charging, OTG	Type-C (reversible), USB 3.2, Features: Charging, Headphones port, OTG, Video out
Hearing aid compatible
M3/T4		M3/T3
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, Galileo, BeiDou, QZSS, NavIC, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Barometer	Accelerometer, Gyroscope, Compass	Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer
Other
NFC, Ultra Wideband (UWB)	NFC	NFC, ANT+

Regulatory Approval

FCC approval
Date approved: Nov 26, 2024 FCC ID value: A3LSMS938U		Date approved: Dec 22, 2020 FCC ID value: A3LSMG998U
Measured SAR
Head: 1.26 W/kg Body: 0.64 W/kg Simultaneous Transmission: 1.19 W/kg		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
$ 1299 / € 1449	$ 1199 / € 1299	$ 1200 / € 1399
In The Box
USB-C cable, SIM ejector tool, Paperwork		C to C Data Cable, Ejection Pin

Availability

Officially announced
Jan 22, 2025		Jan 14, 2021

Alternative variants

With 512GB internal storage

Internal storage	512GB
MSRP	$ 1420

With 24GB RAM and 1TB internal storage

RAM	24GB
Internal storage	1024GB
MSRP	$ 1499 / € 1499

with 256GB storage

Internal storage	256GB
Colors	Phantom black
MSRP	$ 1250

With 1TB internal storage

Internal storage	1024GB
MSRP	$ 1660

with 512GB storage

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

International

5G	Bands n1, n2, n3, n5, n7, n8, n12, n20, n25, n28, n38, n40, n41, n66, n75, n77, n78, SA, NSA, Sub-6
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), 18(800 Lower), 19(800 Upper), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 32(1500 L-band), 66(AWS-3)
4G (TDD)	Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
SIM type	Dual Nano SIM + eSIM

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, 64-bit
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
Samsung Galaxy S25 Ultra Specs	Asus ROG Phone 9 Pro Specs	Samsung Galaxy S21 Ultra Specs
PhoneArena Review
Samsung Galaxy S25 Ultra Review	Asus ROG Phone 9 Pro Review	Samsung Galaxy S21 Ultra Review
User Reviews
Samsung Galaxy S25 Ultra User Reviews		Samsung Galaxy S21 Ultra User Reviews