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Asus ROG Phone 3 (128GB/12GB) vs Samsung Galaxy S21 Ultra (SM-G998B/DS 128GB)

Side by side comparison between Asus ROG Phone 3 vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?

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Compare Samsung Galaxy S21 Ultra X Asus ROG Phone 3 (128GB/12GB) 04Points
6.59"
AMOLED

1080x2340

64
MP

24mp

12GB
RAM

Octa-core

6000
mAh

(Non removable)

vs
23Points Samsung Galaxy S21 Ultra (SM-G998B/DS 128GB) Compare Asus ROG Phone 3 X
6.8"
AMOLED

1440x3200

108
MP

40mp

12GB
RAM

Octa-core

5000
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra (SM-G998B/DS 128GB)

The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!

ROG Phone 3 (128GB/12GB)} 4 Advantages Asus ROG Phone 3 (128GB/12GB) vs Galaxy S21 Ultra (SM-G998B/DS 128GB)} 23 Advantages Samsung Galaxy S21 Ultra (SM-G998B/DS 128GB)
+144Hz20%
The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
vs120Hz
+1 billion62 times
More colors on the screen is better quality images and videos
vs16 million
+6000 mAh20%
Battery - higher amperage (mAh) allows more device usage time, but it also depends on the hardware and use
vs5000 mAh
+30W20%
More power (watts) to charge the battery faster. Sometimes, the charger that comes with the device doesn't have the same power supported by the device. Check before you buy it.
vs25W
3.09GHz 64bit Octa-core (7nm)vs+2.9GHz 64bit Octa-core (5nm)1%
More powerful processor, you can open your applications faster
240 grams (8.4 ounces)vs+227 grams (7.95 ounces)6%
Lighter
9.85 millimeters (0.39 inches)vs+8.9 millimeters (0.35 inches)11%
Thinner
AMOLEDvs+Dynamic AMOLEDAdvantage
Dynamic AMOLED display is brighter and more vivid
1080x2340 pixelsvs+1440x3200 pixels82%
Higher resolution screen
391 PPIvs+516 PPI32%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
6.59"vs+6.8"3%
Larger screen
(triple camera) 64MP + 13MP + 5MPvs+(quad camera) 108MP + 10MP + 10MP + 12MP71%
Higher resolution main camera
Only digital zoomvs+Digital and optical zoomAdvantage
The zoom allows for better focus and approach to take pictures
EIS: Digital stabilizationvs+OIS: Optical stabilizationAdvantage
Image stabilization prevents blurry photos and helps in recording motion video
1/1.72" inchesvs+1/1.33" inches29%
The larger sensor camera lets you take photos with better depth.
(front) 24MPvs+(front) 40MP68%
Higher resolution secondary camera to take pictures and selfies
(front) Full HD (1920x1080)vs+(front) 4K UHD (3840x2160)3 times
More image quality for recording videos with the secondary camera
Android 10vs+Android 14Advantage
Android 14 is newer and safer
Not supportedvs+BarometerAdvantage
Sensors help you use the device
Not supportedvs+UWB (Ultra Wideband)Advantage
Sensors help you use the device
Not supportedvs+Qi wireless charging (Qi/PMA)Advantage
Wireless charging is another way to charge the battery.
2 slots (Dual-SIM)vs+2 slots (Dual-SIM) + e-SIM (Eletronic)Advantage
You can have more mobile carriers/operators on the same device.
Not supportedvs+FMAdvantage
The radio lets you listen to your songs and sports in general
Not supportedvs+DLNAAdvantage
With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
5.1 + A2DP/LEvs+5.2 + A2DP/LEAdvantage
Bluetooth 5.2 + A2DP/LE is newer and faster
USB 3.1 Type-C, USB OTG On-The-Govs+USB 3.2 Type-C, USB OTG On-The-GoAdvantage
Newer and faster USB version for transferring photos, mp3 or data.
Not supportedvs+IP68 certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example

28 Common items in both devices
12GB LPDDR5
128GB (100GB available) / 128GB (101GB available)
UFS 3.1
Aluminum frame, glass front/back
HDR10+
LED flash
PDAF: phase detection autofocus / PDAF: phase detection autofocus on both cameras
+21 specs and more in the table below

Check the comparison table below for more items that are not evaluated in comparison score above.

Highlight differences Clear highlight

📱 Model features

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
ModelROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Other model namesAsus ROG Phone 3 ZS661KS, ZS661KSF (12GB RAM)Galaxy S21 Ultra 5G (SM-G998B/Dual-SIM)
Country or region available(Global, International)
(Global, International)
(Global, International)
(Global, International)
BrandAsusSamsung
Release date7/22/20201/29/2021, Announced: 1/14/2021
Depth9.85 millimeters (0.39 inches)8.9 millimeters (0.35 inches)
Size (width x height)78 x 171 millimeters (3.07 x 6.73 in)75.6 x 165.1 millimeters (2.98 x 6.5 in)
Weight240 grams (8.4 ounces)227 grams (7.95 ounces)
Build, materialsAluminum frame, glass front/backAluminum frame, glass front/back
Protection against water and othersNot supportedIP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant

📲 Display

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Display typeAMOLEDDynamic AMOLED
Screen size6.59" inches6.8" inches
Screen-to-body ratio~79.9% (screen-to-body ratio)~89.4% (screen-to-body ratio)
Display resolution1080x2340 pixels (19.5:9)1440x3200 pixels (20:9)
TouchscreenCapacitive Multitouch 10-pointsCapacitive Multitouch 10-points
Pixel density (dot pitch)391 PPI516 PPI
Colors1 billion16 million
Scratch-resistant glassGorilla Glass 6Gorilla Glass Victus
Refresh rate144Hz120Hz
Display features650nits[typ]
HDR10+
1500nits[peak]
HDR10+
Always-On Display

🤖 Operating System

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
System versionAndroid 10Android 11
Firmware updatefeature not registeredAndroid 14
User Interfacefeature not registeredOne UI 3.1 / 4.1 / 5.1 / 6.0

⚙️ Processor

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Chipset64bit: Qualcomm Snapdragon 865+ (SM8250-AB) (7nm)64bit: Samsung Exynos 2100 (5nm)
CPUOcta-core, 3 processors:
1x 3.09GHz Kryo 585 (Single-core)
3x 2.42GHz Kryo 585 (Triple-core)
4x 1.8GHz Kryo 585 (Quad-core)
Octa-core, 3 processors:
1x 2.9GHz ARM Cortex-X1 (Single-core)
3x 2.8GHz ARM Cortex-A78 (Triple-core)
4x 2.2GHz ARM Cortex-A55 (Quad-core)
GPU graphical controllerQualcomm Adreno 650 (250-646MHz)ARM Mali-G78 MP14 (854MHz)
Performance (benchmark)feature not registeredAnTuTu: 657150 (v8), 727634 (v9)
Geekbench: 3457 (v5.2)
GFXBench: 51fps (ES 3.1 onscreen)

💽 Memory and storage

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
RAM memory12GB LPDDR512GB LPDDR5
Internal storage128GB (100GB available)
UFS 3.1
128GB (101GB available)
UFS 3.1
External storageNot supportedNot supported

📶 Mobile networks

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Dual-SIMDual-SIM Standby - Call active on one sim cardDual-SIM Standby - Call active on one sim card
SIM card2 slots (Dual-SIM)
nano-SIM (4FF)
2 slots (Dual-SIM)
nano-SIM (4FF) + e-SIM
Maximum Download / Upload5000/150 Mbps5000/1920 Mbps
Network technology2G, 3G, 4G, 5G2G, 3G, 4G, 5G
Frequency, bands Expand band details Collapse details
GSM MHz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkCDMA 800, GSM 850/900/1800/1900GSM 850/900/1800/1900
Primary 3G networkCDMA2000 1xEV-DO
TD-SCDMA 1900/2000
UMTS 800/850/900/1700/1900/2100
UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat20
VoLTE
A version:
LTE (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 29, 30, 32, 66, 71)
TD-LTE (34, 38, 39, 40, 41, 42, 48)
B version:
LTE (1, 2, 3, 4, 5, 7, 8, 20, 28)
TD-LTE (34, 38, 39, 40, 41)
LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66)
TD-LTE (38, 39, 40, 41)
VoLTE
Primary 5G networkA version:
SA/NSA (1, 2, 3, 5, 28, 41, 66, 71, 77, 78, 79)
B version:
SA/NSA (41, 77, 78, 79)
SA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78)
Primary data networkGPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSAGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
Secondary 2G networkGSM 850/900/1800/1900GSM 850/900/1800/1900
Secondary 3G networkNot supportedUMTS 850/900/1700/1900/2100
Secondary 4G networkNot supportedLTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66)
TD-LTE (38, 39, 40, 41)
VoLTE
Secondary data networkGPRS, EDGEGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA

📷 Camera

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Back camera (main camera)(triple camera)
64 megapixels
13MP ultrawide f/2.4125°11mm
5MP macro f/2.0
(quad camera)
108 megapixels
10MP periscope telephoto f/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom
10MP telephoto f/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom
12MP ultrawide f/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video
Main camera resolution10120x6328 pixels12000x9000 pixels
Video recording (primary)8K UHD (7680x4320) 30 fps8K UHD (7680x4320) 24 fps
FlashLED flashLED flash
Focal aperturef/1.8 (aperture)f/1.8 (aperture)
Focal length26mm lens26mm lens
Sensor size1/1.72" inches1/1.33" inches
Pixel size0.8µm pixel1.8µm pixel
AutofocusPDAF: phase detection autofocusPDAF: phase detection autofocus on both cameras
Touch focusSupportedSupported
Image stabilizationEIS: Digital stabilizationOIS: Optical stabilization
ZoomOnly digital zoomDigital and optical zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorNot supportedSupported
HDRHDR photo on both camerasHDR photo/video on both cameras
Camera extrasfeature not registered4K@60fps
1080p@240fps
720p@960fps

📸 Front camera

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Front camera (secondary)24 megapixels40 megapixels
Front camera resolution5632x4224 pixels7296x5472 pixels
Video recording (secondary)Full HD (1920x1080)4K UHD (3840x2160)
Front flashNot supportedNot supported
Focal aperturef/2.0 (aperture)f/2.2 (aperture)
Focal length27mm lens26mm lens
Sensor sizefeature not registered1/2.8" inches
Pixel size0.9µm pixel0.7µm pixel

🔉 Sound and multimedia

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
LoudspeakerSupportedStereo sound
32-bit/384kHz
Dolby Atmos
Tuned by AKG
Active noise cancellation2 microphones or more2 microphones or more
RadioNot supportedFM
TVNot supportedNot supported
Video formatsMP4, H.265, H.264, H.263, XviD, MKVMP4, H.265, H.264, H.263, XviD, MKV
Audio formatsMP3, WAV, WMA, eAAC+, FLACMP3, WAV, WMA, eAAC+, FLAC

🔌 Connectivity

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
USBUSB 3.1 Type-C, USB OTG On-The-GoUSB 3.2 Type-C, USB OTG On-The-Go
Audio outputType-C jack with 3.5mm jack adapterType-C reversible connector
TV outputUSB Type-C (reversible)USB Type-C (reversible)
Bluetooth5.1 + A2DP/LE5.2 + A2DP/LE
WiFi802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO
WiFi Direct, hotspot
802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO
WiFi Direct, hotspot
DLNANot supportedSupported
GPSA-GPS, GeoTagging, GLONASS, GALILEO, QZSSA-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFCSupportedSupported
Infrared portNot supportedNot supported

🧭 Sensors

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
SensorsAccelerometer
Ambient light sensor
Compass
Face unlock
Fingerprint sensor (under display)
Gesture
Gyroscope
Hall effect
Proximity sensor
Accelerometer
Ambient light sensor
Barometer
Compass
Face unlock
Fingerprint sensor (under display)
Gesture
Gyroscope
Hall effect
Proximity sensor
UWB (Ultra Wideband)
Vibrating alertSupportedSupported

🔋 Battery

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Battery typeLiPo: li-ion polymer (Non removable)LiPo: li-ion polymer (Non removable)
Battery capacity6000 mAh5000 mAh
Charger, watts30W Wired fast charging
10W Reverse charging by cable
Quick Charge 3/4
USB Power Delivery 3.0
25W Wired fast charging
USB Power Delivery 3.0
Inductive / wireless chargingNot supported15W Qi wireless charging (Qi/PMA)
4.5W Reverse wireless charging
Talk time autonomyfeature not registeredfeature not registered
Standbyfeature not registeredfeature not registered

➕ Other features

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
Call controlVoice dialing, Voice recorder, Voice commandsVoice dialing, Voice recorder, Voice commands
MessagingSMS (T9), MMS, E-mail, Push mailSMS (T9), MMS, E-mail, Push mail
Hands-free callingSupportedSupported
Video callingSupportedSupported
RingtonesPolyphonic and customizedPolyphonic and customized
Web browserHTML, XHTML, HTML5HTML, XHTML, HTML5
AntennaInternal antennaInternal antenna
Qwerty physical keyboardNot supportedNot supported
Miscellaneous• Colors: Black glare
• ROG UI (Republic Of Gamers)
• Always-On display
• DTS:X stereo speakers (2 amplifiers)
• 24-bit/192kHz audio
• AeroActive Cooler 3
• Colors: Phantom Black, Silver, Titanium, Navy, Brown
• Samsung Pay (Visa, MasterCard)
• Samsung DeX
• Stylus pen support

☢️ Radiation rate

Asus ROG Phone 3 (128GB/12GB)Galaxy S21 Ultra (SM-G998B/DS 128GB)
SAR 1.6W/kg (USA, Mexico, etc.)0.74W/kg (head), 1.5W/kg (body)0.24W/kg (head), 0.72W/kg (body)
SAR 2W/kg (Europe, UK, etc.)feature not registered0.714W/kg (head), 1.58W/kg (body)
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