Samsung Galaxy S21 Plus vs OnePlus 9

73 out of 100

69 out of 100

Here we compared two flagship smartphones: the 6.7-inch Samsung Galaxy S21 Plus (with Exynos 2100) that was released on January 14, 2021, against the OnePlus 9, which is powered by Qualcomm Snapdragon 888 5G and came out 3 months after. On this page, you will find tests, full specs, strengths, and weaknesses of each of the devices.

Differences
Review
Specs
Benchmarks
Battery life
Camera
Comments

Key differences

An overview of the main advantages of each smartphone

Reasons to consider the Samsung Galaxy S21 Plus

Waterproof body (IP68 classification)
48% better performance in AnTuTu Benchmark (839K versus 568K)
Shows 7% longer battery life (30:26 vs 28:34 hours)
Optical image stabilization
The rear camera has a 1.1x optical zoom
Slow-motion recording at 960FPS
Comes with 300 mAh larger battery capacity: 4800 vs 4500 mAh
Reverse charging feature
The front-facing camera can record video at 4K
Ready for eSIM technology

Reasons to consider the OnePlus 9

Newer Bluetooth version (v5.2)
Supports higher wattage charging (65W versus 25W)

Review

Evaluation of Samsung Galaxy S21 Plus and OnePlus 9 crucial features

Display

Screen quality, color accuracy, brightness

Type	Dynamic AMOLED	AMOLED
Size	6.7 inches	6.55 inches
Resolution	1080 x 2400 pixels	1080 x 2400 pixels
Aspect ratio	20:9	20:9
PPI	394 ppi	402 ppi
Refresh rate	120 Hz	120 Hz
Adaptive refresh rate	No	Yes
Max rated brightness	1300 nits	500 nits
Max rated brightness in HDR	-	1100 nits
HDR support	Yes, HDR10+	Yes, HDR10+
Screen protection	Gorilla Glass Victus	Corning Gorilla Glass 5
Screen-to-body ratio	88.3%	87.6%
Display features	- DCI-P3 - Always-On Display	- DCI-P3 - Always-On Display - DC Dimming

RGB color space	98.9%	98.9%
PWM	240 Hz	323 Hz
Response time	6.2 ms	13 ms
Contrast	∞ Infinity	∞ Infinity

Height	161.5 mm (6.36 inches)	160 mm (6.3 inches)
Width	75.6 mm (2.98 inches)	74.2 mm (2.92 inches)
Thickness	7.8 mm (0.31 inches)	8.7 mm (0.34 inches)
Weight	200 g (7.05 oz)	192 g (6.77 oz)
Waterproof	IP68	No
Rear material	Glass	Glass
Frame material	Metal	Plastic
Colors	Black, Silver, Gold, Red, Purple	Black, Blue, Purple
Fingerprint scanner	Yes, in-display	Yes, in-display

Chipset	Samsung Exynos 2100	Qualcomm Snapdragon 888 5G
Max clock	2840 MHz	2840 MHz
CPU cores	8 (1 + 3 + 4)	8 (1 + 3 + 4)
Architecture	- 4 cores at 2.2 GHz: Cortex-A55 - 3 cores at 2.81 GHz: Cortex-A78 - 1 core at 2.91 GHz: Cortex-X1	- 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)
L3 cache	-	4 MB
Lithography process	5 nanometers	5 nanometers
Graphics	Mali-G78 MP14	Adreno 660
GPU shading units	896	1024
GPU clock	854 MHz	840 MHz
FLOPS	~1530.4 GFLOPS	~1622 GFLOPS

CPU	244088	172607
GPU	269299	115432
Memory	159004	118133
UX	164833	160667
Total score	839148	568602

Max surface temperature	41.5 °C	48.8 °C
Stability	67%	55%
Graphics test	33 FPS	34 FPS
Graphics score	5538	5761

Web score	-	10625
Video editing	-	6059
Photo editing	-	25728
Data manipulation	-	11092
Writing score	-	15632

RAM size	8 GB	8, 12 GB
Memory type	LPDDR5	LPDDR5
Memory clock	2750 MHz	2750 MHz
Channels	2	4

Storage size	128, 256 GB	128, 256 GB
Storage type	UFS 3.1	UFS 3.1
Memory card	No	No

Operating system	Android 11 (Can be upgraded to Android 13)	Android 11 (Can be upgraded to Android 13)
ROM	One UI 5.1	OxygenOS 13
OS size	27.2 GB	35 GB

Capacity	4800 mAh	4500 mAh
Max charge power	25 W	65 W
Battery type	Li-Ion	Li-Po
Replaceable	No	No
Wireless charging	Yes (15 W)	Yes (15 W)
Reverse charging	Yes, (wireless)	No
Fast charging	Yes (54% in 30 min)	Yes (100% in 29 min)
Full charging time	1:12 hr	0:29 hr

Battery life tests
Web browsing	09:17 hr	10:27 hr
Watching video	15:27 hr	12:25 hr
Gaming	05:07 hr	04:06 hr
Standby	101 hr	92 hr

Main camera
Matrix	12 megapixels	48 megapixels
Image resolution	4000 x 3000	8000 x 6000
Zoom	Optical, 1.1x	Digital
Flash	Dual LED	Dual LED
Stabilization	Optical	Digital
8K video recording	Up to 24FPS	Up to 30FPS
4K video recording	Up to 60FPS	Up to 120FPS
1080p video recording	Up to 60FPS	Up to 60FPS
Slow motion	960 FPS (720p)	240 FPS (1080p)
Angle of widest lens	120°	140°
Lenses	3 (12 MP + 64 MP + 12 MP)	3 (48 MP + 50 MP + 2 MP)
Wide (main) lens	- 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	- 48 MP - Aperture: f/1.8 - Focal length: 23 mm - Pixel size: 1.12 micron - Sensor: 1/1.43", Sony IMX689 (Exmor-RS CMOS) - Phase autofocus
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: 13 mm - Pixel size: 1.4 micron - Sensor: 1/2.55", Sony IMX563 (Exmor-RS CMOS) - Phase autofocus (Dual Pixel)	- 50 MP - Aperture: f/2.2 - Focal length: 14 mm - Pixel size: 1 micron - Sensor: 1/1.56", Sony IMX766 (Exmor-RS CMOS) - Phase autofocus
Monochrome lens	-	- 2 MP - Aperture: f/2.4
Camera features	- Bokeh mode - Pro mode - RAW support	- Bokeh mode - Pro mode - RAW support
Samples	Photo samples of Samsung Galaxy S21 Plus from DxOMark	Photo samples of OnePlus 9 from DxOMark

Selfie camera
Megapixels	10 megapixels	16 megapixels
Image resolution	3872 x 2592	4920 x 3264
Aperture	f/2.2	f/2.0
Focal length	26 mm	-
Pixel size	1.22 microns	1 microns
Sensor type	Exmor-RS CMOS	Exmor-RS CMOS
Sensor size	1/3.24"	1/3.06"
Video resolution	2160p (4K) at 60 FPS	1080p (Full HD) at 30 FPS

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 Direct - Wi-Fi Hotspot - Wi-Fi Display
Bluetooth version	5	5.2
Bluetooth features	LE, A2DP	LE, A2DP
USB type	USB Type-C	USB Type-C
USB version	3.2	3.1
USB features	- Charging - USB-Storage mode - USB-Host mode - OTG	- Charging - USB-Storage mode - OTG
GPS	GPS, GLONASS, Beidou, Galileo	GPS, GLONASS, Beidou, Galileo, SBAS
NFC *	Yes	Yes
Infrared port	No	No

Number of SIM *	2	2
Type of SIM card	Nano	Nano
Multi SIM mode	Standby	Standby
eSIM support *	Yes	No
Hybrid slot	No	No
LTE Cat *	24	20
5G support	Yes	Yes

Speakers	Stereo	Stereo
Headphone audio jack	No	No
FM radio	No	No
Dolby Atmos	Yes	Yes

Category	Flagship	Flagship
Announced	January 2021	March 2021
Release date	February 2021	March 2021
SAR (head)	0.54 W/kg	-
SAR (body)	1.33 W/kg	-
Sensors	- Hall-effect sensor - Barometer - Proximity sensor - Gyroscope - Accelerometer - Ambient light sensor - Compass - Fingerprint	- Barometer - Proximity sensor - Gyroscope - Accelerometer - Ambient light sensor - Compass - Fingerprint

Samsung Galaxy S21 Plus vs OnePlus 9

Samsung Galaxy S21 Plus vs OnePlus 9

Key differences

Review

Value for money

Tests and specifications

Display

Design and build

Performance

Benchmarks

Memory

Software

Battery

Camera

DxOMark camera tests

Connectivity

Sound

Other

Conclusion