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Xiaomi Redmi Note 8 vs Samsung Galaxy A21s

Here we compared two smartphones: the 6.3-inch Xiaomi Redmi Note 8 (with Qualcomm Snapdragon 665) that was released on August 29, 2019, against the Samsung Galaxy A21s, which is powered by Exynos 850 and came out 8 months after. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Xiaomi Redmi Note 8
  • 51% higher pixel density (409 vs 270 PPI)
  • 41% better performance in AnTuTu Benchmark (176K versus 125K)
  • Delivers 28% higher maximum brightness (635 against 498 nits)
  • Slow-motion recording at 240FPS
  • Ability to record video in 4K resolution
  • 69% faster in single-core GeekBench 5 test: 321 and 190 points
  • Has a built-in infrared port
Reasons to consider the Samsung Galaxy A21s
  • Comes with 1000 mAh larger battery capacity: 5000 vs 4000 mAh
  • Shows 10% longer battery life (119 vs 108 hours)
  • More recent OS version: Android 11 versus 10
  • More energy-efficient CPU – Exynos 850
  • Supports Dolby Atmos sound technology
  • The phone is 8-months newer

Review

Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation

Value for money

You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Price

Tests and specifications

Comparison table of technical specifications and tests

Display

Type IPS LCD PLS TFT
Size 6.3 inches 6.5 inches
Resolution 1080 x 2340 pixels 720 x 1600 pixels
Aspect ratio 19.5:9 20:9
PPI 409 ppi 270 ppi
Refresh rate 60 Hz 60 Hz
HDR support No No
Screen protection Corning Gorilla Glass 5 Tempered glass
Screen-to-body ratio 81.7% 82.8%
Display tests
RGB color space - 88.4%
PWM - 500 Hz
Response time - 30.4 ms
Contrast - 1500:1
Max. Brightness
635 nits
498 nits
Sources: NotebookCheck [1]

Design and build

Height 158.3 mm (6.23 inches) 163.6 mm (6.44 inches)
Width 75.3 mm (2.96 inches) 75.3 mm (2.96 inches)
Thickness 8.4 mm (0.33 inches) 8.9 mm (0.35 inches)
Weight 190 gramm (6.7 oz) 192 gramm (6.77 oz)
Waterproof No No
Rear material Glass Plastic
Frame material Plastic Plastic
Colors White, Black, Blue Black, Blue, Red
Fingerprint scanner Yes, rear Yes, rear
Screen-to-body ratio
81.7%
82.8%

Performance

Tests of Xiaomi Redmi Note 8 and Samsung Galaxy A21s in the benchmarks
SoC
Chipset Qualcomm Snapdragon 665 Samsung Exynos 850
Max. clock 2000 MHz 2000 MHz
CPU cores 8 (4 + 4) 8 (8)
Architecture - 4 cores at 1.8 GHz: Kryo 260 Silver (Cortex-A53)
- 4 cores at 2 GHz: Kryo 260 Gold (Cortex-A73)
- 8 cores at 2 GHz: Cortex-A55
Lithography process 11 nanometers 8 nanometers
Graphics Adreno 610 Mali-G52 MP1
GPU clock 600 MHz 820 MHz
FLOPS ~273 GFLOPS ~26 GFLOPS
Memory
RAM size 3, 4, 6 GB 3, 4 GB
Memory type LPDDR4X LPDDR4X
Memory clock 1866 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 32, 64 GB
Storage type eMMC 5.1 eMMC 5.1
Memory card MicroSD MicroSD
Memory card max. size Up to 256 GB Up to 512 GB

Benchmarks

Geekbench 5 (Single-Core)
321
Geekbench 5 (Multi-Core)
1337
AnTuTu Benchmark 7
AnTuTu Benchmark 8
176664
125696

Software

Operating system Android 9.0 (Can be upgraded to Android 10) Android 10 (Can be upgraded to Android 11)
ROM MIUI 12 One UI 3.0
OS size - 12 GB

Battery

Specifications
Capacity 4000 mAh 5000 mAh
Charge power 18 W 15 W
Battery type Li-Ion Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes, Quick Charge 4.0 (50% in 35 min) Yes (50% in 60 min)
Full charging time 2:05 hr 2:10 hr

Battery life tests

Web browsing (Wi-Fi)
16:00 hr
18:02 hr
Watching videos (Player)
14:24 hr
17:29 hr
Talk (3G)
25:01 hr
39:38 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 48 megapixels
Image resolution 8000 x 6000 8000 x 6000
Zoom Digital Digital
Flash LED LED
Stabilization Digital Digital
8K video recording No No
4K video recording Up to 30FPS No
1080p video recording Up to 30FPS Up to 30FPS
Slow motion 240 FPS (720p) No
Angle of widest lens 118° 123°
Lenses 4 (48 MP + 8 MP + 2 MP + 2 MP) 4 (48 MP + 8 MP + 2 MP + 2 MP)
Wide (main) lens - 48 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Samsung S5KGM2 (ISOCELL CMOS)
- Phase autofocus
- 48 MP
- Aperture: f/2.0
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2.0" (CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
- Sensor: 1/5", Omnivision OV8856
- 8 MP
- Aperture: f/2.2
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
Macro lens - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5", Omnivision OV02A10 (CMOS)
- 2 MP
- Aperture: f/2.4
Depth lens - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5", Omnivision OV02A10 (CMOS)
- 2 MP
- Aperture: f/2.4
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
Selfie camera
Megapixels 13 megapixels 13 megapixels
Image resolution 4224 x 3136 4128 x 3096
Aperture f/2.0 f/2.2
Focal length 28.21 mm -
Pixel size 1.12 microns 1.12 microns
Sensor type - CMOS
Sensor size 1/2.9" 1/3.1"
Video resolution 1080p (Full HD) при 30 FPS 1080p (Full HD) при 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 5 (802.11 b/g/n/ac) Wi-Fi 5 (802.11 a/b/g/n/ac)
Wi-Fi features - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 5
Bluetooth features LE, HID, A2DP PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
- OTG
GPS GPS, GLONASS, Beidou GPS, GLONASS, Beidou, Galileo
NFC* No Yes
Infrared port Yes No
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No No
Hybrid slot No No
LTE Cat* 12 13
5G support No No

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes Yes
Dolby Atmos No Yes
Speakers test
Max. loudness
81.3 dB
79.5 dB

Other

Category Mid-range Budget
Announced August 2019 May 2020
Release date September 2019 June 2020
Launch price ~ 187 USD ~ 200 USD
SAR (head) 0.191 W/kg 0.23 W/kg
SAR (body) 1.034 W/kg 1.38 W/kg
Sensors - Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Hall-effect sensor
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
*Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.

Conclusion

If the display, performance, and camera are more important to you, then choose the Xiaomi Redmi Note 8. But if the software, battery life, and sound are more of a priority – go for the Samsung Galaxy A21s.

Cast your vote

So, which phone would you choose?
210 (58.3%)
150 (41.7%)
Total votes: 360

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