Samsung Galaxy Z Flip 3 5G vs Galaxy S21

Here we compared two flagship smartphones: the 6.7-inch Samsung Galaxy Z Flip 3 5G (with Qualcomm Snapdragon 888 5G) that was released on August 11, 2021, against the Samsung Galaxy S21, which is powered by Exynos 2100 and came out 7 months before. 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 Samsung Galaxy Z Flip 3 5G
  • Newer Bluetooth version (v5.1)
  • Has a 0.5 inch larger screen size
  • Delivers 9% higher peak brightness (926 against 849 nits)
  • The phone is 7-months newer
Reasons to consider the Samsung Galaxy S21
  • Waterproof body (IP68 classification)
  • Shows 27% longer battery life (25:31 vs 20:09 hours)
  • Comes with 700 mAh larger battery capacity: 4000 vs 3300 mAh
  • The rear camera has a 1.1x optical zoom
  • 11% better performance in AnTuTu Benchmark (762K versus 689K)
  • Has 2 SIM card slots
  • Weighs 14 grams less

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 Dynamic AMOLED Dynamic AMOLED
Size 6.7 inches 6.2 inches
Resolution 1080 x 2640 pixels 1080 x 2400 pixels
Aspect ratio 21.9:9 20:9
PPI 426 ppi 421 ppi
Refresh rate 120 Hz 120 Hz
Max rated brightness 850 nits 800 nits
Max rated brightness in HDR 1200 nits -
HDR support Yes, HDR10+ Yes, HDR10+
Screen protection Gorilla Glass Victus Gorilla Glass Victus
Screen-to-body ratio 84.7% 87.2%
Display features - DCI-P3
- Always-On Display
- DCI-P3
- Always-On Display
Display tests
RGB color space 95.3% 99.5%
PWM 242 Hz 240 Hz
Response time 6.5 ms 5 ms
Contrast ∞ Infinity ∞ Infinity
Peak brightness test (auto)
926 nits
849 nits
Sources: NotebookCheck [3], [4]

Design and build

Height 166 mm (6.54 inches) 151.7 mm (5.97 inches)
Width 72.2 mm (2.84 inches) 71.2 mm (2.8 inches)
Thickness 6.9 mm (0.27 inches) 7.9 mm (0.31 inches)
Weight 183 gramm (6.46 oz) 169 gramm (5.96 oz)
Waterproof IPX8 IP68
Rear material Glass Plastic
Frame material Metal Metal
Colors White, Black, Gray, Green, Pink White, Gray, Pink, Purple
Fingerprint scanner Yes, in home button Yes, in-display
Screen-to-body ratio
87.2%

Performance

Tests of Samsung Galaxy Z Flip 3 5G and Samsung Galaxy S21 in the benchmarks
SoC
Chipset Qualcomm Snapdragon 888 5G Samsung Exynos 2100
Max. clock 2840 MHz 2900 MHz
CPU cores 8 (1 + 3 + 4) 8 (1 + 3 + 4)
Architecture - 4 cores at 1.8 GHz: Kryo 680 Silver (Cortex-A55)
- 3 cores at 2.42 GHz: Kryo 680 Gold (Cortex-A78)
- 1 core at 2.84 GHz: Kryo 680 Prime (Cortex-X1)
- 4 cores at 2.2 GHz: Cortex-A55
- 3 cores at 2.8 GHz: Cortex-A78
- 1 core at 2.9 GHz: Cortex-X1
L3 cache 4 MB -
Lithography process 5 nanometers 5 nanometers
Graphics Adreno 660 Mali-G78 MP14
GPU clock 840 MHz 760 MHz
FLOPS ~1720 GFLOPS -
Memory
RAM size 8 GB 8 GB
Memory type LPDDR5 LPDDR5
Memory clock 2750 MHz 2750 MHz
Channels 2 2
Storage
Storage size 128, 256 GB 128, 256 GB
Storage type UFS 3.1 UFS 3.1
Memory card No No

Benchmarks

Geekbench 5 (Single-Core)
Geekbench 5 (Multi-Core)
AnTuTu Benchmark 9
Galaxy S21 +11%
762351
CPU 206991 203417
GPU 227511 272156
Memory 138296 144766
UX 123353 146598
Total score 689236 762351
3DMark Wild Life Performance
Stability 70% 66%
Graphics test 27 FPS 33 FPS
Graphics score 4573 5659
PCMark 3.0 score 13708 13812
AnTuTu 9 Android Ranking (149th and 109th place)
Sources: 3DMark [3], [4]

Software

Operating system Android 11 (Can be upgraded to Android 13) Android 11 (Can be upgraded to Android 13)
ROM One UI 5.0 One UI 5.0
OS size 29 GB 28.1 GB

Battery

Specifications
Capacity 3300 mAh 4000 mAh
Charge power 25 W 25 W
Battery type Li-Ion Li-Ion
Replaceable No No
Wireless charging Yes (10 W) Yes (15 W)
Reverse charging Yes, (wireless) Yes, (wireless)
Fast charging Yes (40% in 30 min) Yes (55% in 50 min)
Full charging time 1:30 hr 1:35 hr
Battery life tests
Web browsing 06:58 hr 07:17 hr
Watching video 09:12 hr 12:26 hr
Gaming 03:32 hr 04:20 hr
Standby 64 hr 92 hr
General battery life
Galaxy S21 +27%
25:31 hr

Camera

Specs and camera test of smartphones
Main camera
Matrix 12 megapixels 12 megapixels
Image resolution 4000 x 3000 4000 x 3000
Zoom Digital Optical, 1.1x
Flash LED Dual LED
Stabilization Optical Optical
8K video recording No Up to 24FPS
4K video recording Up to 60FPS Up to 60FPS
1080p video recording Up to 60FPS Up to 60FPS
Slow motion 960 FPS (720p) 960 FPS (720p)
Angle of widest lens 123° 120°
Lenses 2 (12 MP + 12 MP) 3 (12 MP + 64 MP + 12 MP)
Wide (main) lens - 12 MP
- Aperture: f/1.8
- Focal length: 27 mm
- Pixel size: 1.4 micron
- Sensor: 1/2.55", Sony IMX563 (Exmor-RS CMOS)
- Phase autofocus (Dual Pixel)
- Optical stabilization
- 12 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 1.8 micron
- Sensor: 1/1.76", Sony IMX555 (Exmor-RS CMOS)
- Phase autofocus (Dual Pixel)
- Optical stabilization
Telephoto lens - - 64 MP
- Aperture: f/2.0
- Focal length: 28 mm
- Pixel size: 0.8 micron
- Sensor: 1/1.72", Samsung Bright S5KGW2 (ISOCELL Plus CMOS)
- Phase autofocus (Dual Pixel)
- Optical stabilization
Ultra-wide lens - 12 MP
- Aperture: f/2.2
- Focal length: 22 mm
- Pixel size: 1.12 micron
- Sensor: 1/3.06", Sony IMX258 (Exmor-RS CMOS)
- 12 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.4 micron
- Sensor: 1/2.55", Sony IMX563 (Exmor-RS CMOS)
- Phase autofocus (Dual Pixel)
Camera features - Bokeh mode
- Pro mode
- RAW support
- Bokeh mode
- Pro mode
- RAW support
Samples Photo samples of Samsung Galaxy Z Flip 3 5G from DxOMark Photo samples of Samsung Galaxy S21 from DxOMark
Selfie camera
Megapixels 10 megapixels 10 megapixels
Image resolution 3648 x 2736 3872 x 2592
Aperture f/2.4 f/2.2
Focal length 26 mm 26 mm
Pixel size 1.22 microns 1.22 microns
Sensor type Exmor-RS CMOS CMOS
Sensor size 1/3.2" 1/3.24"
Video resolution 2160p (4K) at 30 FPS 2160p (4K) at 60 FPS

DxOMark camera tests

Photo quality
Video quality
Generic camera score

Connectivity

Wi-Fi standard Wi-Fi 6 (802.11 a/b/g/n/ac/ax) Wi-Fi 6 (802.11 a/b/g/n/ac/ax)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.1 5
Bluetooth features LE, A2DP LE, A2DP
USB type USB Type-C USB Type-C
USB version 2 3.2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
- USB-Host mode
- OTG
GPS GPS, GLONASS, Beidou, Galileo GPS, GLONASS, Beidou, Galileo
NFC* Yes Yes
Infrared port No No
Network
Number of SIM* 1 2
Type of SIM card Nano Nano
Multi SIM mode - Standby
eSIM support* Yes Yes
Hybrid slot No No
LTE Cat* 20 24
5G support Yes Yes

Sound

Speakers Stereo Stereo
Headphone audio jack No No
FM radio No No
Dolby Atmos Yes Yes
Speakers test
Max. loudness
88.6 dB
87 dB

Other

Category Flagship Flagship
Announced August 2021 January 2021
Release date August 2021 February 2021
SAR (head) 0.86 W/kg 0.46 W/kg
SAR (body) 1.58 W/kg 1.51 W/kg
Sensors - Hall-effect sensor
- Barometer
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Hall-effect sensor
- Barometer
- 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

These smartphones have a lot in common, but we would recommend the Samsung Galaxy S21. It has a better battery life and connectivity.

Cast your vote

So, which phone would you choose?
49 (57%)
37 (43%)
Total votes: 86

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