Samsung Galaxy A51 vs Samsung Galaxy S25 Ultra Specs Comparison

Display

Size
6.5-inch	6.9-inch
Resolution
2400x1080px, 20:9 ratio, 405 PPI	3120x1440px, 19.5:9 ratio, 498 PPI
Technology
Super AMOLED	Dynamic AMOLED
Refresh rate
60Hz	120Hz
Screen-to-body
87.37 %	90.30 %
Peak brightness
	2600 cd/m2 (nit)
Features
Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor	HDR support, Scratch-resistant glass (Corning Gorilla Glass Armor 2), Ambient light sensor, Proximity sensor

Hardware

System chip
Samsung Exynos 9611 (10 nm)	Qualcomm Snapdragon 8 Elite for Galaxy SM8750-AB (3 nm)
Processor
Octa-core 2300 MHz 4x 2.3GHz Cortex-A73 + 4x 1.7GHz Cortex-A53 64-bit	Octa-core 2x 4.47GHz Oryon V2 Phoenix L + 6x 3.53GHz Oryon V2 Phoenix M 64-bit
GPU
Mali-G72 MP3	Adreno 830
RAM
4GB (LPDDR4)	12GB (LPDDR5X)
Internal storage
128GB, available to use: 105.9 GB	256GB (UFS 4.0), not expandable
Storage expansion
microSDXC up to 512 GB
OS
Android (11, 10), Samsung One UI	Android (15), One UI

Battery

Capacity
4000 mAh	5000 mAh
Type
Li - Polymer, Not user replaceable	Li - Ion, Not user replaceable
Charging
Fast charging	Fast charging, Qi wireless charging, Reverse wireless charging
Max charge speed
	Wired: 45.0W Wireless: 15.0W

PhoneArena Battery Tests

Battery Life Estimate

5h 22min

Browsing

11h 35min

Video

8h 35min

Gaming

6h 40min

Battery Life Estimate

8h 0min

Browsing

20h 49min

Video

8h 54min

Gaming

14h 21min

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

Camera

Rear
Quad camera	Quad camera
Main camera
48 MP (PDAF) Aperture size: F2.0 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm	200 MP (OIS, Laser and PDAF) Aperture size: F1.7 Focal length: 24 mm Sensor size: 1/1.3" Pixel size: 0.6 μm
Second camera
12 MP (Ultra-wide) Aperture size: F2.2 Focal Length: 13 mm Pixel size: 1.12 μm	50 MP (Ultra-wide, PDAF) Aperture size: F1.9 Pixel size: 0.7 μm
Third camera
5 MP (Macro) Aperture size: F2.4 Focal Length: 40 mm	10 MP (Telephoto, OIS, PDAF) Optical zoom: 3.0x Aperture size: F2.4 Focal Length: 67 mm Sensor size: 1/3.52" Pixel size: 1.12 μm
Fourth camera
5 MP (Depth information) Aperture size: F2.2 Sensor size: 1/5" Pixel size: 1.12 μm	50 MP (Telephoto, Periscope, OIS, PDAF) Optical zoom: 5.0x Aperture size: F3.4 Focal Length: 111 mm Sensor size: 1/2.52" Pixel size: 0.7 μm
Flash
LED	LED
Video recording
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps) Hyperlapse, EIS	7680x4320 (8K UHD) (30 fps), 3840x2160 (4K UHD) (120 fps), 1920x1080 (Full HD) (240 fps) HDR, Continuous autofocus, Picture-taking during video recording
Front
32 MP (HDR), Video capture: 1920x1080 (Full HD)	12 MP (PDAF, HDR), Video capture: 3840x2160 (4K UHD) (60 fps)

PhoneArena Camera Tests

N/A

Overall

N/A

Photo

N/A

Video

158

Overall

165

Photo

150

Video

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

Design

Dimensions
6.24 x 2.90 x 0.31 inches (158.5 x 73.6 x 7.9 mm)	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)
Weight
6.07 oz(172.0 g)	7.69 oz(218.0 g)
Materials
Back: Plastic Frame: Plastic	Back: Glass (Corning Gorilla Glass Armor 2) Frame: Titanium
Resistance
	Water, Dust; IP68
Biometrics
2D Face unlock, Optical in-screen fingerprint	Ultrasonic in-screen fingerprint
Features
	Stylus
Keys
Right: Volume control, Lock/Unlock key	Right: Volume control, Lock/Unlock key
Colors
Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue	Titanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray

Cellular

5G
	Bands n1, n2, n5, n7, n25, n28, n41, n66, n71, n77, n78, n257, n258, 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), 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), 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)
4G (TDD)
Bands 38(2600), 39(1900+), 41(2600+)	Bands 38(2600), 39(1900+), 40(2300), 41(2600+), 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), 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), HSDPA+ (4G) 42.2 Mbit/s
SIM type
Nano SIM	Nano SIM, eSIM

Multimedia

Headphones
3.5mm jack	No 3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Multiple speakers
Features
Dolby Atmos	aptX, aptX-HD
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM
Additional microphone(s)
Noise cancellation	Noise cancellation

Connectivity & Features

Bluetooth
5.0	5.4
Wi-Fi
802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,ax(Wi-Fi 6),Wi-Fi 6E,Wi-Fi 7 Wi-Fi Direct, Hotspot
USB
Type-C (reversible), USB 2.0, Features: Charging, OTG	Type-C (reversible), USB 3.2, Features: Charging, OTG
Hearing aid compatible
	M3/T4
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers)	Accelerometer, Gyroscope, Compass, Barometer
Other
NFC, ANT+	NFC, Ultra Wideband (UWB)

Regulatory Approval

FCC approval
Date approved: Nov 28, 2019 FCC ID value: A3LSMA515FN	Date approved: Nov 26, 2024 FCC ID value: A3LSMS938U
Measured SAR
Head: 0.89 W/kg Body: 1.18 W/kg Simultaneous Transmission: 1.56 W/kg Wireless Router: 1.12 W/kg Phablet: 2.76 W/kg	Head: 1.26 W/kg Body: 0.64 W/kg Simultaneous Transmission: 1.19 W/kg

Buyers information

MSRP
$ 400	$ 1299 / € 1449
In The Box
	USB-C cable, SIM ejector tool, Paperwork

Availability

Officially announced
Dec 12, 2019	Jan 22, 2025

Alternative variants

with 128GB storage

RAM	6GB
Internal storage	128GB

With 512GB internal storage

Internal storage	512GB
MSRP	$ 1420

for Verizon

4G (FDD)	Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 13(700 c), 20(800 DD), 28(700 APT), 66(AWS-3)
3G	Bands 5(850), 8(900), 2(1900), 1(2100)

With 1TB internal storage

Internal storage	1024GB
MSRP	$ 1660

for AT&T

4G (FDD)	Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

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 Sprint

4G (FDD)	Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

for Europe

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), 20(800 DD), 26(850+), 28(700 APT), 66(AWS-3)
4G (TDD)	Bands 38(2600), 40(2300), 41(2600+)
Dual SIM	Yes

Links

Full specifications
Samsung Galaxy A51 Specs	Samsung Galaxy S25 Ultra Specs
PhoneArena Review
Samsung Galaxy A51 Review	Samsung Galaxy S25 Ultra Review
User Reviews
Samsung Galaxy A51 User Reviews	Samsung Galaxy S25 Ultra User Reviews