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Samsung Galaxy S21 Ultra (SM-G998N 256GB) vs Motorola Moto G51 (128GB/6GB)

Side by side comparison between Samsung Galaxy S21 Ultra vs Motorola Moto G51 phones, differences, pros, cons and full specifications. What's the better?

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Compare Motorola Moto G51 XSamsung Galaxy S21 Ultra (SM-G998N 256GB)31Points
Samsung Galaxy S21 Ultra (SM-G998N 256GB)
6.8"
AMOLED

1440x3200

108
MP

40mp

12GB
RAM

64bit Octa

5000
mAh

(Non removable)

vs
04PointsMotorola Moto G51 (128GB/6GB)Compare Samsung Galaxy S21 Ultra X
Motorola Moto G51 (128GB/6GB)
6.8"
IPS

1080x2400

50
MP

13mp

6GB
RAM

64bit Octa

5000
mAh

(Non removable)

What's the better phone? Samsung Galaxy S21 Ultra (SM-G998N 256GB)

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!

Galaxy S21 Ultra (SM-G998N 256GB)31 Advantages Samsung Galaxy S21 Ultra (SM-G998N 256GB)vsMoto G51 (128GB/6GB)4 Advantages Motorola Moto G51 (128GB/6GB)
+2.9GHz 64bit Octa-Core19%
More powerful processor, you can open your applications faster
vs2.2GHz 64bit Octa-Core
+12GB LPDDR5100%
More RAM memory. Typically more responsive and better for multitasking.
vs6GB LPDDR4X
+256GB (220GB available)104%
More internal storage for applications and files
vs128GB (108GB available)
+UFS 3.1Advantage
Fastest write and read storage.
vseMMC 5.1
+8.9 millimeters (0.35 inches)2%
Thinner
vs9.1 millimeters (0.36 inches)
+Aluminum frame, glass front/backAdvantage
More resistant material
vsPlastic body, glass front
+Dynamic AMOLEDAdvantage
Dynamic AMOLED display is brighter and more vivid
vsTFT IPS LCD
+HDR10+Advantage
The HDR10+ display provides vibrant colors and more details
vsNot supported
+1440x3200 pixels78%
Higher resolution screen
vs1080x2400 pixels
+516 PPI33%
Crisper display of text, images and videos because it has more pixels per inch (ppi)
vs387 PPI
+(quad camera) 108MP + 10MP + 10MP + 12MP134%
Higher resolution main camera
vs(triple camera) 50MP + 8MP + 2MP
+Digital and optical zoomAdvantage
The zoom allows for better focus and approach to take pictures
vsOnly digital zoom
+OIS: Optical stabilizationAdvantage
Image stabilization prevents blurry photos and helps in recording motion video
vsEIS: Digital stabilization
+1/1.33" inches108%
The larger sensor camera lets you take photos with better depth.
vs1/2.76" inches
+(front) 40MP2 times
Higher resolution secondary camera to take pictures and selfies
vs(front) 13MP
+8K UHD (7680x4320)15 times
More image quality for recording videos with the primary camera
vsFull HD (1920x1080)
+(front) 4K UHD (3840x2160)3 times
More image quality for recording videos with the secondary camera
vs(front) Full HD (1920x1080)
+Android 13Advantage
Android 13 is newer and safer
vsAndroid 11
+(5G SA/NSA) 5000 Mbps150%
Faster for surfing the internet and download files
vs(5G SA/NSA) 2000 Mbps
+ANT+Advantage
Sensors help you use the device
vsNot supported
+BarometerAdvantage
Sensors help you use the device
vsNot supported
+CompassAdvantage
Sensors help you use the device
vsNot supported
+25W150%
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.
vs10W
+Qi wireless charging (Qi/PMA)Advantage
Wireless charging is another way to charge the battery.
vsNot supported
+Stereo soundAdvantage
Better sound quality for listening to music or clearer hands-free calls
vsMono sound (not stereo)
+802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMOAdvantage
WiFi 802.11 a/b/g/n/ac/ax wifi6 (2.4Ghz, 5Ghz) + MIMO is newer and faster
vs802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO
+DLNAAdvantage
With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
vsNot supported
+5.2 + A2DP/LEAdvantage
Bluetooth 5.2 + A2DP/LE is newer and faster
vs5.1 + A2DP/LE
+USB 3.2 Type-C, USB OTG On-The-GoAdvantage
Newer and faster USB version for transferring photos, mp3 or data.
vsUSB 2.0 Type-C, USB OTG On-The-Go
+Gorilla Glass VictusAdvantage
Protection against scratches on the screen lets you carry your phone with your keys
vsNot supported
+IP68 certifiedAdvantage
Protection against water allows you talk to your friends in the rain, for example
vsIP52 certified
Not supportedvs+Until 512GB microSD, microSDXCAdvantage
More external storage for files using memory cards
227 grams (7.95 ounces)vs+208 grams (7.28 ounces)9%
Lighter
1 slot (Single-SIM)vs+2 slots (Dual-SIM)
(hybrid slot/shares the same microSD slot)Advantage
You can have more mobile carriers/operators on the same device.
Type-C reversible connectorvs+3.5mm jackAdvantage
Headsets with 3.5mm Jack size are more common and easy to find in stores

27 Common items in both devices
120Hz
16 million
6.8"
LED flash
PDAF: phase detection autofocus on both cameras / PDAF: phase detection autofocus
BSI sensor
HDR photo/video on both cameras / HDR photo on both cameras
+20 specs and more in the table below

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

Highlight differencesClear highlight

📱 Model features

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
ModelGalaxy S21 Ultra (SM-G998N 256GB)Moto G51 (128GB/6GB)
Other model names갤럭시 S21 Ultra 5G (SM-G998N Single-SIM)Lenovo Moto G51 5G (XT2171-1, XT2171-2, XT2171-3)
Country or region availableSouth Korea
South Korea
(Global, International)
(Global, International)
BrandSamsungMotorola
Release date1/29/2021, Announced: 1/14/202111/30/2021, Announced: 11/3/2021
Depth8.9 millimeters (0.35 inches)9.1 millimeters (0.36 inches)
Size (width x height)75.6 x 165.1 millimeters (2.98 x 6.5 in)76.5 x 170.5 millimeters (3.01 x 6.71 in)
Weight227 grams (7.95 ounces)208 grams (7.28 ounces)
Build, materialsAluminum frame, glass front/backPlastic body, glass front
Protection against water and othersIP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistantIP52 certified: protection against dust and splashing

🤖 Operating System

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
System versionAndroid 11Android 11
Firmware updateAndroid 13feature not registered
User InterfaceOne UI 3.1 / 4.1 / 5.0My UX

⚙️ Processor

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
Chipset64bit - Samsung Exynos 2100 (5nm)64bit - Qualcomm Snapdragon 480+ (SM4350-AC) (8nm)
CPUOcta-Core, 3 processors:
2.9GHz Single-Core ARM Cortex-X1
2.8GHz Triple-Core ARM Cortex-A78
2.2GHz Quad-Core ARM Cortex-A55
Octa-Core, 2 processors:
2.2GHz Dual-Core Kryo 460
1.8GHz Hexa-Core Kryo 460
GPU graphical controllerARM Mali-G78 MP14 (854MHz)Qualcomm Adreno 619
Performance (benchmark)AnTuTu: 657150 (v8), 727634 (v9)
Geekbench: 3457 (v5.2)
GFXBench: 51fps (ES 3.1 onscreen)
feature not registered

💽 Memory and storage

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
RAM memory12GB LPDDR56GB LPDDR4X
Internal storage256GB (220GB available)
UFS 3.1
128GB (108GB available)
eMMC 5.1
External storageNot supportedUntil 512GB microSD, microSDXC
(hybrid slot/shares the same SIM-2 slot)

📲 Display

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
Display typeDynamic AMOLEDTFT IPS LCD
Screen size6.8" inches6.8" inches
Screen-to-body ratio~89.4% (screen-to-body ratio)~85.6% (screen-to-body ratio)
Display resolution1440x3200 pixels (20:9)1080x2400 pixels (20:9)
TouchscreenCapacitive Multitouch 10-pointsCapacitive Multitouch
Pixel density (dot pitch)516 PPI387 PPI
Colors16 million16 million
Scratch-resistant glassGorilla Glass VictusNot supported
Refresh rate120Hz120Hz
Display features1500nits[peak]
HDR10+
Always-On Display
Not supported

📶 Mobile networks

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
Dual-SIMNot supportedDual-SIM Standby - Call active on one sim card
(hybrid slot/shares the same microSD slot)
SIM card1 slot (Single-SIM)
nano-SIM (4FF)
2 slots (Dual-SIM)
nano-SIM (4FF)
Maximum download/upload5000/1920 Mbps2000/1024 Mbps
Network technology2G, 3G, 4G, 5G2G, 3G, 4G, 5G
Frequency, bandsExpand band detailsCollapse details
GSM MHz bandQuad-Band 850/900/1800/1900Quad-Band 850/900/1800/1900
Primary 2G networkGSM 850/900/1800/1900GSM 850/900/1800/1900
Primary 3G networkUMTS 850/900/1700/1900/2100UMTS 850/900/1700/1900/2100
Primary 4G networkLTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 66)
TD-LTE (38, 39, 40, 41)
VoLTE
LTE Cat15 (1, 2, 3, 5, 7, 8, 18, 20, 26, 28, 32)
TD-LTE (38, 40, 41, 42, 43)
VoLTE
Primary 5G networkSA/NSA/Sub6 (77, 78)SA/NSA (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 77, 78)
Primary data networkGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSAGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSA
Secondary 2G networkNot supportedGSM 850/900/1800/1900
Secondary 3G networkNot supportedUMTS 850/900/1700/1900/2100
Secondary 4G networkNot supportedLTE Cat15 (1, 2, 3, 5, 7, 8, 18, 20, 26, 28, 32)
TD-LTE (38, 40, 41, 42, 43)
VoLTE
Secondary data networkNot supportedGPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, 5G SA/NSA

📷 Camera

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
Back camera (main camera)(quad camera)
108 megapixels
10MP periscope telephotof/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom
10MP telephotof/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom
12MP ultrawidef/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video
(triple camera)
50 megapixels
8MP ultrawidef/2.2118°1/4"1.12µm
2MP macrof/2.4
Main camera resolution12000x9000 pixels8160x6120 pixels
Video recording (primary)8K UHD (7680x4320) 24 fpsFull HD (1920x1080) 60 fps
FlashLED flashLED flash
Focal aperturef/1.8 (aperture)f/1.8 (aperture)
Focal length26mm lensfeature not registered
Sensor size1/1.33" inches1/2.76" inches
Pixel size1.8µm pixel0.64µm pixel
AutofocusPDAF: phase detection autofocus on both camerasPDAF: phase detection autofocus
Touch focusSupportedSupported
Image stabilizationOIS: Optical stabilizationEIS: Digital stabilization
ZoomDigital and optical zoomOnly digital zoom
Face/smile detectionFace detection, Smile detectionFace detection, Smile detection
BSI sensorSupportedSupported
HDRHDR photo/video on both camerasHDR photo on both cameras
Camera extras4K@60fps
1080p@240fps
720p@960fps
1080p@240fps

📸 Front camera

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
Front camera (secondary)40 megapixels13 megapixels
Front camera resolution7296x5472 pixels4128x3096 pixels
Video recording (secondary)4K UHD (3840x2160)Full HD (1920x1080)
Front flashNot supportedNot supported
Focal aperturef/2.2 (aperture)f/2.2 (aperture)
Focal length26mm lensfeature not registered
Sensor size1/2.8" inchesfeature not registered
Pixel size0.7µm pixel1.12µm pixel

🔉 Sound and multimedia

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
LoudspeakerStereo sound
32-bit/384kHz
Dolby Atmos
Tuned by AKG
Mono sound (not stereo)
Dolby Atmos
Active noise cancellation2 microphones or more2 microphones or more
RadioFMFM
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

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
USBUSB 3.2 Type-C, USB OTG On-The-GoUSB 2.0 Type-C, USB OTG On-The-Go
Audio outputType-C reversible connector3.5mm jack
TV outputUSB Type-C (reversible)USB Type-C (reversible)
Bluetooth5.2 + A2DP/LE5.1 + 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 (2.4Ghz, 5Ghz) + MIMO
WiFi Direct, hotspot
DLNASupportedNot supported
GPSA-GPS, GeoTagging, GLONASS, GALILEO, BeiDouA-GPS, GeoTagging, GLONASS, GALILEO
NFCSupportedSupported
Infrared portNot supportedNot supported

🧭 Sensors

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
SensorsAccelerometer
Ambient Light sensor
ANT+
Barometer
Compass
Face unlock
Fingerprint sensor (under display)
Gesture
Gyroscope
Hall effect
Proximity sensor
Accelerometer
Ambient Light sensor
Face unlock
Fingerprint sensor (rear-mounted)
Gyroscope
Proximity sensor
Vibrating alertSupportedSupported

🔋 Battery

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
Battery typeLiPo: Li-Ion polymer (Non removable)LiPo: Li-Ion polymer (Non removable)
Battery capacity5000 mAh5000 mAh
Charger, watts25W Fast battery charging
15W Qi wireless charging (Qi/PMA)
4.5W Reverse wireless charging between devices
USB Power Delivery 3.0
10W Standard charging
Talk time autonomyfeature not registeredfeature not registered
Standbyfeature not registeredfeature not registered

➕ Other features

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
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: Phantom Black, Silver, Titanium, Navy, Brown
- Samsung Pay (Visa, MasterCard)
- Samsung DeX
- Stylus pen support
- Colors: Indigo Blue, Aqua Blue, Bright Silver

☢️ Radiation rate

Samsung Galaxy S21 Ultra (SM-G998N 256GB)Motorola Moto G51 (128GB/6GB)
SAR 1.6W/kg (USA, Mexico, etc.)0.489W/kg (head), 1.1W/kg (body)feature not registered
SAR 2W/kg (Europe, UK, etc.)feature not registeredfeature not registered
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