Motorola Moto G31 (128GB/4GB) vs Samsung Galaxy S21 Ultra (SM-G998B 128GB)

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Side by side comparison between Motorola Moto G31 vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?

12/29/2021 1:14 PM, updated: 5/19/2025 11:26 AM

Compare Samsung Galaxy S21 Ultra X Motorola Moto G31 (128GB/4GB) 04Points

Specifications Compare Models Pictures

6.4"
AMOLED

1080x2400

50
MP

13mp

4GB
RAM

Octa-core

5000
mAh

(Non removable)

32Points Samsung Galaxy S21 Ultra (SM-G998B 128GB) Compare Motorola Moto G31 X

Specifications Compare Models Pictures

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 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!

4 Advantages Motorola Moto G31 (128GB/4GB)	vs	32 Advantages Samsung Galaxy S21 Ultra (SM-G998B 128GB)
+Until 1TB microSD, microSDXCAdvantage More external storage for files using memory cards	vs	Not supported
+181 grams (6.34 ounces)25% Lighter	vs	227 grams (7.95 ounces)
+8.6 millimeters (0.34 inches)3% Thinner	vs	8.9 millimeters (0.35 inches)
+3.5mm jackAdvantage Headsets with 3.5mm Jack size are more common and easy to find in stores	vs	Type-C reversible connector
2GHz 64bit Octa-core (12nm)	vs	+2.9GHz 64bit Octa-core (5nm)34% More powerful processor, you can open your applications faster
4GB LPDDR4X	vs	+12GB LPDDR52 times More RAM memory. Typically more responsive and better for multitasking.
eMMC 5.1	vs	+UFS 3.1Advantage Fastest write and read storage.
Plastic body, glass front	vs	+Aluminum frame, glass front/backAdvantage More resistant material
AMOLED	vs	+Dynamic AMOLEDAdvantage Dynamic AMOLED display is brighter and more vivid
Not supported	vs	+HDR10+Advantage The HDR10+ display provides vibrant colors and more details
60Hz	vs	+120Hz100% The display reproduces more frames per second because the frequency (Hertz) is higher, improves fluidity and tires your eyes less.
1080x2400 pixels	vs	+1440x3200 pixels78% Higher resolution screen
411 PPI	vs	+516 PPI26% Crisper display of text, images and videos because it has more pixels per inch (ppi)
6.4"	vs	+6.8"6% Larger screen
(triple camera) 50MP + 8MP + 2MP	vs	+(quad camera) 108MP + 10MP + 10MP + 12MP134% Higher resolution main camera
Only digital zoom	vs	+Digital and optical zoomAdvantage The zoom allows for better focus and approach to take pictures
EIS: Digital stabilization	vs	+OIS: Optical stabilizationAdvantage Image stabilization prevents blurry photos and helps in recording motion video
(front) 13MP	vs	+(front) 40MP2 times Higher resolution secondary camera to take pictures and selfies
Full HD (1920x1080)	vs	+8K UHD (7680x4320)15 times More image quality for recording videos with the primary camera
(front) Full HD (1920x1080)	vs	+(front) 4K UHD (3840x2160)3 times More image quality for recording videos with the secondary camera
Android 11	vs	+Android 15Advantage Android 15 is newer and safer
4G LTE-A	vs	+5G SA/NSAAdvantage The 5G SA/NSA network is newer and faster
(4G LTE-A) 300 Mbps	vs	+(5G SA/NSA) 5000 Mbps16 times Faster for surfing the internet and download files
Not supported	vs	+BarometerAdvantage Sensors help you use the device
Not supported	vs	+UWB (Ultra Wideband)Advantage Sensors help you use the device
10W	vs	+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.
Not supported	vs	+Qi wireless charging (Qi/PMA)Advantage Wireless charging is another way to charge the battery.
2 slots (Dual-SIM) (hybrid slot/shares the same microSD slot)	vs	+1 slot (Single-SIM) + e-SIM (Eletronic)Advantage You can have more mobile carriers/operators on the same device.
Mono sound (not stereo)	vs	+Stereo soundAdvantage Better sound quality for listening to music or clearer hands-free calls
802.11 a/b/g/n/ac [wifi5]	vs	+802.11 a/b/g/n/ac/ax [wifi6]Advantage WiFi 802.11 a/b/g/n/ac/ax [wifi6] is newer and faster
Not supported	vs	+DLNAAdvantage With DLNA technology you can access and play media files on TV, tablet or DLNA compatible device.
5.0 + A2DP/LE	vs	+5.2 + A2DP/LEAdvantage Bluetooth 5.2 + A2DP/LE is newer and faster
Not supported	vs	+NFCAdvantage NFC allows you to make payments by approach quickly and securely
USB 2.0 Type-C reversible connector	vs	+USB 3.2 Type-C, USB OTG On-The-GoAdvantage Newer and faster USB version for transferring photos, mp3 or data.
Not supported	vs	+Gorilla Glass VictusAdvantage Protection against scratches on the screen lets you carry your phone with your keys
Water repellent nano-coating (don't immerse)	vs	+IP68 certifiedAdvantage Protection against water allows you talk to your friends in the rain, for example

25 Common items in both devices

128GB (108GB available) / 128GB (101GB available)

16 million

LED flash

PDAF: phase detection autofocus / PDAF: phase detection autofocus on both cameras

BSI sensor

HDR photo on both cameras / HDR photo/video on both cameras

f/1.8 (aperture)

+18 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

📱 Model features
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Change model		Choose the model
Model	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Other model names	Lenovo Moto G31 XT2173-1, XT2173-2, XT2173-3	Galaxy S21 Ultra 5G (SM-G998B Single-SIM)
Country or region available	(Europe), (Global, International)	Australia
Brand	Motorola	Samsung
Release date	12/6/2021, Announced: 11/18/2021	1/29/2021, Announced: 1/14/2021
Depth	8.6 millimeters (0.34 inches)	8.9 millimeters (0.35 inches)
Size (width x height)	73.87 x 161.89 millimeters (2.91 x 6.37 in)	75.6 x 165.1 millimeters (2.98 x 6.5 in)
Weight	181 grams (6.34 ounces)	227 grams (7.95 ounces)
Build, materials	Plastic body, glass front	Aluminum frame, glass front/back
Protection against water and others	Water repellent nano-coating (don't immerse)	IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant
📲 Display
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Display type	AMOLED	Dynamic AMOLED
Screen size	6.4" inches	6.8" inches
Screen-to-body ratio	~82.7% (screen-to-body ratio)	~89.4% (screen-to-body ratio)
Display resolution	1080x2400 pixels (20:9)	1440x3200 pixels (20:9)
Touchscreen	Capacitive Multitouch	Capacitive Multitouch 10-points
Pixel density (dot pitch)	411 PPI	516 PPI
Colors	16 million	16 million
Scratch-resistant glass	Not supported	Gorilla Glass Victus
Refresh rate	60Hz	120Hz
Display features	Not supported	1500nits[peak] HDR10+ Always-On Display
🤖 Operating System
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
System version	Android 11	Android 11
Firmware update	feature not registered	Android 15
User Interface	feature not registered	One UI 3.1 / 4.1 / 5.1 / 6.0 / 7.0
⚙️ Processor
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Chipset	64bit: MediaTek Helio G85 (12nm)	64bit: Samsung Exynos 2100 (5nm)
CPU	Octa-core, 2 processors: 2x 2GHz ARM-Cortex-A75 (Dual-core) 6x 1.8GHz ARM-Cortex-A55 (Hexa-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 controller	ARM Mali-G52 MC2 (1GHz)	ARM Mali-G78 MP14 (854MHz)
Performance (benchmark)	AnTuTu: 228765 (v9)	AnTuTu: 657150 (v8), 727634 (v9) Geekbench: 3457 (v5.2) GFXBench: 51fps (ES 3.1 onscreen)
💽 Memory and storage
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
RAM memory	4GB LPDDR4X	12GB LPDDR5
Internal storage	128GB (108GB available) eMMC 5.1	128GB (101GB available) UFS 3.1
External storage	Until 1TB microSD, microSDXC (hybrid slot/shares the same SIM-2 slot)	Not supported
📶 Mobile networks
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Dual-SIM	Dual-SIM Standby - Call active on one sim card (hybrid slot/shares the same microSD slot)	Dual-SIM Standby - Call active on one sim card
SIM card	2 slots (Dual-SIM) nano-SIM (4FF)	1 slot (Single-SIM) nano-SIM (4FF) + e-SIM
Maximum Download / Upload	300/150 Mbps	5000/1920 Mbps
Network technology	2G, 3G, 4G	2G, 3G, 4G, 5G
Frequency, bands	Expand band details Collapse details
GSM MHz band	Quad-Band 850/900/1800/1900	Quad-Band 850/900/1800/1900
Primary 2G network	GSM 850/900/1800/1900	GSM 850/900/1800/1900
Primary 3G network	UMTS 850/900/1700/1900/2100	UMTS 850/900/1700/1900/2100
Primary 4G network	LTE Cat7 (1, 2, 3, 5, 7, 8, 18, 19, 20, 26, 28) TD-LTE (38, 40, 41) VoLTE	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 network	Not supported	SA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78)
Primary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
Secondary 2G network	GSM 850/900/1800/1900	GSM 850/900/1800/1900
Secondary 3G network	UMTS 850/900/1700/1900/2100	UMTS 850/900/1700/1900/2100
Secondary 4G network	LTE Cat7 (1, 2, 3, 5, 7, 8, 18, 19, 20, 26, 28) TD-LTE (38, 40, 41) VoLTE	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
Secondary data network	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A	GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA
📷 Camera
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Back camera (main camera)	(triple camera) 50 megapixels 8MP ultrawide f/2.2118°1/4"1.12µm 2MP macro f/2.4	(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 resolution	8160x6120 pixels	12000x9000 pixels
Video recording (primary)	Full HD (1920x1080) 30 fps	8K UHD (7680x4320) 24 fps
Flash	LED flash	LED flash
Focal aperture	f/1.8 (aperture)	f/1.8 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	feature not registered	1/1.33" inches
Pixel size	0.64µm pixel	1.8µm pixel
Autofocus	PDAF: phase detection autofocus	PDAF: phase detection autofocus on both cameras
Touch focus	Supported	Supported
Image stabilization	EIS: Digital stabilization	OIS: Optical stabilization
Zoom	Only digital zoom	Digital and optical zoom
Face/smile detection	Face detection, Smile detection	Face detection, Smile detection
BSI sensor	Supported	Supported
HDR	HDR photo on both cameras	HDR photo/video on both cameras
Camera extras	feature not registered	4K@60fps 1080p@240fps 720p@960fps
📸 Front camera
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Front camera (secondary)	13 megapixels	40 megapixels
Front camera resolution	4128x3096 pixels	7296x5472 pixels
Video recording (secondary)	Full HD (1920x1080)	4K UHD (3840x2160)
Front flash	Not supported	Not supported
Focal aperture	f/2.2 (aperture)	f/2.2 (aperture)
Focal length	feature not registered	26mm (lens)
Sensor size	feature not registered	1/2.8" inches
Pixel size	1.12µm pixel	0.7µm pixel
🔉 Sound and multimedia
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Loudspeaker	Mono sound (not stereo) Dolby Atmos	Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG
Active noise cancellation	2 microphones or more	3 microphones
Radio	FM	FM
TV	Not supported	Not supported
Video formats	MP4, H.265, H.264, H.263, XviD, MKV	MP4, H.265, H.264, H.263, XviD, MKV
Audio formats	MP3, WAV, WMA, eAAC+, FLAC	MP3, WAV, WMA, eAAC+, FLAC
🔌 Connectivity
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
USB	USB 2.0 Type-C reversible connector	USB 3.2 Type-C, USB OTG On-The-Go
Audio output	3.5mm jack	Type-C reversible connector
TV output	Not supported	USB Type-C (reversible)
Bluetooth	5.0 + A2DP/LE	5.2 + A2DP/LE
WiFi	802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) WiFi Direct, hotspot	802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot
DLNA	Not supported	Supported
GPS	A-GPS, GeoTagging, GLONASS, GALILEO	A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou
NFC	Not supported	Supported
Infrared port	Not supported	Not supported
🧭 Sensors
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Sensors	Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (side-mounted) Gyroscope Proximity sensor	Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband)
Vibrating alert	Supported	Supported
🔋 Battery
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Battery type	LiPo: li-ion polymer (Non removable)	LiPo: li-ion polymer (Non removable)
Battery capacity	5000 mAh	5000 mAh
Charger, watts	10W Wired charging	25W Wired fast charging USB Power Delivery 3.0
Inductive / wireless charging	Not supported	15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging
Talk time autonomy	feature not registered	feature not registered
Standby	feature not registered	feature not registered
➕ Other features
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
Call control	Voice dialing, Voice recorder, Voice commands	Voice dialing, Voice recorder, Voice commands
Messaging	SMS (T9), MMS, E-mail, Push mail	SMS (T9), MMS, E-mail, Push mail
Hands-free calling	Supported	Supported
Video calling	Supported	Supported
Ringtones	Polyphonic and customized	Polyphonic and customized
Web browser	HTML, XHTML, HTML5	HTML, XHTML, HTML5
Antenna	Internal antenna	Internal antenna
Qwerty physical keyboard	Not supported	Not supported
Miscellaneous	• Colors: Mineral Grey, Baby Blue	• Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support
☢️ Radiation rate
	Moto G31 (128GB/4GB)	Galaxy S21 Ultra (SM-G998B 128GB)
SAR 1.6W/kg (USA, Mexico, etc.)	feature not registered	0.24W/kg (head), 0.72W/kg (body)
SAR 2W/kg (Europe, UK, etc.)	feature not registered	0.714W/kg (head), 1.58W/kg (body)