Categories
Google Pixel 4a vs. Samsung Galaxy S21 5G SM-G991B 256GB
Built-in camera
Yes
Yes
Front camera
Yes
Yes
Effective pixels front camera
8 megapixels
10 megapixels
Number of front cameras
1 ​
1 ​
Camera features
Autofocus, Built-in flash/lamp, Optical image stabilization (OIS), Electronic image stabilization (EIS)
Autofocus, Built-in flash/lamp, Optical image stabilization (OIS), Electronic image stabilization (EIS), Optical zoom
Effective pixels
12.2 megapixels
12 megapixels
Maximum lens aperture
1.7
1.8
Number of rear cameras
1 ​
3 ​
Sensor format
1/1.76"
Video recording
Yes
Yes
Max frame rate (highest resolution)
30 fps
24 fps
Max frame rate (regardless of res.)
120 fps
960 fps
Max resolution (highest frame rate)
1280x720 (HD 720) pixels
1280x720 (HD 720) pixels
Maximum resolution (video)
3840x2160 (4K Ultra HD) pixels
7680x4320 (8K Ultra HD) pixels
2G (GSM)
Yes
Yes
3G (UMTS)
Yes
Yes
HSPA+
Yes
Yes
4G (LTE)
Yes
Yes
4G: Speed (down/up)
Cat.20/18: 2000/200 Mbit/s
5G (NR)
No
Yes
Frequency range (5G)
FR1 (Sub-6 GHz)
Bluetooth
Yes
Yes
Bluetooth codec
aptX, aptX HD, LDAC, AAC
Bluetooth profile
A2DP
A2DP
Bluetooth version
5.0
5.1
Built-in navigation system
Yes
Yes
Type of navigation system
GPS, A-GPS, BeiDou, Galileo, GLONASS, QZSS
GPS, A-GPS, BeiDou, Galileo, GLONASS
NFC
Yes
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)
802.11a, 802.11b, 802.11g, 802.11n (Wi-Fi 4), 802.11ac (Wi-Fi 5), 802.11ax (Wi-Fi 6)
Streaming standards
Google Cast/Chromecast
Data connector
USB
USB
Type of USB connector
USB (Type C)
USB (Type C)
USB On-The-Go (OTG)
Yes
Yes
USB version
3 (Gen 1)
3 (Gen 1)
Headphone output (2.5/3.5 mm)
Yes
No
Type of connection
3.5 mm
Colour
Black, Grey
Black, Silver, White, Grey, Purple, Pink
Developed especially for seniors
No
Physical keyboard/numpad
No
No
Dimensions (WxHxD)
Depth
8.2 mm
7.9 mm
Height
144.2 mm
151.7 mm
Width
69.4 mm
71.2 mm
Product weight
143 g
169 g
Built-in sensors
Proximity sensor, Accelerometer, Gyroscope, Barometer
Proximity sensor, Accelerometer, Gyroscope, Barometer
Built-in wireless charging
No
Yes
Wireless standard
QI, PMA
Dual SIM card support
Yes
Yes
Hybrid Dual Sim
No
No
Type of Dual SIM
SIM card + eSIM
SIM card + eSIM
Features
Shock resistant, Built-in stereo speakers
Shock resistant, ANT+, Built-in stereo speakers, Hearing Aid Compatible
Security
Fingerprint reader, Face scanner
Fingerprint reader, Face scanner
SIM card
Nano sim
Nano sim
Supports fast charging
Yes
Yes
Type of quick charge
USB Power Delivery (PD)
Samsung Adaptive Fast Charge
Water resistant
No
Yes
IP code (level of dust/water resistance)
IP68
Series
Pixel
Samsung Galaxy S21
Aspect ratio
19.5:9
20:9
Display features
Scratch resistant display, HDR
Scratch resistant display, HDR, 120Hz refresh rate
Display technology
OLED (AMOLED)
OLED (AMOLED)
Display
Colour
Colour
Number of colours
16 777 216 colours
16 777 216 colours
Pixel density
443 PPI
421 PPI
Screen resolution (HxV)
1080x2340 pixels
1080x2400 pixels
Screen size
5.81 inches
6.2 inches
Touchscreen
Yes
Yes
Material (body/chassis)
Plastic
Aluminium, Plastic
RAM size
6GB
8GB
Release year
2020
2021
Battery capacity
3140 mAh
4000 mAh
Exchangeable battery
No
No
Graphics processor (GPU)
Yes
Yes
Graphics processor type
Adreno 618
ARM Mali-G78 MP14
Processor core type
8 (Octa) Core
8 (Octa) Core
Processor speed
2.2 GHz
2.9 GHz
SoC/CPU (System on Chip)
Qualcomm Snapdragon 730G SDM730G
Samsung Exynos 2100
Operating system (latest version)
Android 11
Android 11
Support for alternative firmware
Internal storage space (size)
128 GB
256 GB
Memory card reader
No
No
