Categories
Samsung Galaxy A51 SM-A515F/DS (6GB RAM) 128GB vs. Samsung Galaxy S21 Ultra 5G SM-G998B 256GB
Built-in camera
Yes
Yes
Front camera
Yes
Effective pixels front camera
40 megapixels
Number of front cameras
1 ​
Camera features
Autofocus, Built-in flash/lamp, Optical image stabilization (OIS), Electronic image stabilization (EIS), Optical zoom
Effective pixels
108 megapixels
Maximum lens aperture
1.8
Number of rear cameras
4 ​
Sensor format
1/1,33"
Video recording
Yes
Max frame rate (highest resolution)
24 fps
Max frame rate (regardless of res.)
960 fps
Max resolution (highest frame rate)
1280x720 (HD 720) pixels
Maximum resolution (video)
7680x4320 (8K Ultra HD) pixels
2G (GSM)
Yes
Yes
3G (UMTS)
Yes
Yes
HSPA+
Yes
4G (LTE)
Yes
Yes
4G: Speed (down/up)
Cat.20/18: 2000/200 Mbit/s
5G (NR)
Yes
Frequency range (5G)
FR1 (Sub-6 GHz), FR2 (mmWave)
Bluetooth
Yes
Yes
Bluetooth codec
Bluetooth profile
A2DP
Bluetooth version
5.1
Built-in navigation system
Yes
Type of navigation system
GPS, BeiDou, Galileo, GLONASS
NFC
Yes
Wireless network (Wi-Fi)
Yes
Yes
Wireless networking standard
802.11a, 802.11b, 802.11g, 802.11n (Wi-Fi 4), 802.11ac (Wi-Fi 5), 802.11ax (Wi-Fi 6)
Streaming standards
Data connector
USB
USB
Type of USB connector
USB (Type C)
USB On-The-Go (OTG)
Yes
USB version
3 (Gen 1)
Headphone output (2.5/3.5 mm)
No
Colour
Black, Silver, White
Black, Silver, Blue, White, Brown
Developed especially for seniors
No
No
Physical keyboard/numpad
No
Dimensions (WxHxD)
Depth
8.9 mm
Height
165.1 mm
Width
75.6 mm
Product weight
227 g
Built-in sensors
Proximity sensor, Accelerometer, Gyroscope, Barometer
Built-in wireless charging
Yes
Wireless standard
QI, PMA
Dual SIM card support
Yes
Hybrid Dual Sim
No
Type of Dual SIM
SIM card + eSIM
Features
FM radio, ANT+, Stylus pen support (Active Digitizer), Built-in stereo speakers, Hearing Aid Compatible
Security
Fingerprint reader, Face scanner
SIM card
Nano sim
Nano sim
Supports fast charging
Yes
Type of quick charge
Samsung Adaptive Fast Charge
Water resistant
Yes
IP code (level of dust/water resistance)
IP68
Series
Galaxy A51
Samsung Galaxy S21
Aspect ratio
20:9
Display features
Scratch resistant display, HDR, 120Hz refresh rate
Display technology
OLED (AMOLED)
OLED (AMOLED)
Display
Colour
Colour
Number of colours
16 777 216 colours
Pixel density
515 PPI
Screen resolution (HxV)
1440x3200 pixels
Screen size
6.7 inches
6.8 inches
Touchscreen
Yes
Yes
Material (body/chassis)
Glass, Aluminium
RAM size
6GB
12GB
Release year
2020
2021
Battery capacity
7000 mAh
5000 mAh
Exchangeable battery
No
Graphics processor (GPU)
Yes
Graphics processor type
ARM Mali-G78 MP14
Processor core type
8 (Octa) Core
Processor speed
2.2 GHz
2.9 GHz
SoC/CPU (System on Chip)
Samsung Exynos 2100
Operating system (latest version)
Android 10 (Android Q)
Android 11
Support for alternative firmware
Internal storage space (size)
128 GB
256 GB
Memory card reader
Yes
No
Compatible memory cards
microSD, microSDXC
Maximum memory card size
