Samsung Galaxy S21 vs OPPO A91 Specs Comparison

Compare mobile phone specifications of up to three devices at once. Our specs comparison tool helps you find and compare the perfect phone for your needs.

8.5
Samsung Galaxy S21	OPPO A91
Released · Jan 29, 2021	Released · Dec 20, 2019
6.2-inch	6.4-inch
Triple camera	Dual camera
8GB · 128GB	4GB · 128GB
4000 mAh	4025 mAh
Check prices	Check prices

Availability

Officially announced
Jan 14, 2021	Dec 20, 2019
Prices (MSRP)
$800

Design

Dimensions
5.97 x 2.80 x 0.31 inches 151.7 x 71.2 x 7.9 mm	6.31 x 2.89 x 0.31 inches 160.2 x 73.3 x 7.9 mm
Weight
6.03 oz (171.0 g)	6.07 oz (172.0 g)
Materials
Back: Plastic Frame: Aluminum	Back: Plastic Frame: Plastic
Resistance
Water, Dust; IP68
Biometrics
2D Face unlock, Ultrasonic in-screen fingerprint	Optical in-screen fingerprint
Keys
Right: Volume control, Lock/Unlock key	Left: Volume control; Right: Lock/Unlock key
Colors
Phantom pink, Violet, Gray, White	Lightening Black, Unicorn White, Blazing Blue

Display

Size
6.2-inch, 86.06% screen-to-body	6.4-inch, 84.05% screen-to-body
Type
Dynamic AMOLED, 120Hz, HDR, 1300 nits	AMOLED, 60Hz
Resolution
2400x1080px, 20:9 ratio, 424 PPI	2400x1080px, 20:9 ratio, 411 PPI
Protection
Corning Gorilla Glass Victus	Corning Gorilla Glass 5

Hardware

System chip
Snapdragon 888 (5 nm)	Mediatek Helio P70 MT6771V (12 nm)
Processor
Octa-core 1x2.84GHz Kryo 680 3x2.42GHz Kryo 680 4x1.80GHz Kryo 680	Octa-core 2100 MHz Cortex-A73
GPU
Adreno 660	Mali-G72 MP3
Memory
8GB (LPDDR5)/128GB (UFS 3.0) 8GB/256GB	4GB (LPDDR4)/128GB (UFS 2.1) 8GB/128GB
Storage expansion
not expandable	microSDXC
OS
Android (13, 12, 11)	Android (9.0 Pie)

Battery

Type
4000 mAh, Li - Polymer	4025 mAh, Li - Polymer
Charging
Qualcomm Quick Charge 2.0, USB Power Delivery, Samsung Adaptive Fast Charging Qi and Powermat wireless charging, Reverse wireless charging	SuperVOOC 3.0
Charge speed
Wired: 25.0W Wireless: 15.0W	Wired: 20.0W

Battery Life Estimate

4h 28min

Browsing

7h 47min

Video

7h 36min

Gaming

7h 9min

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Camera

Rear
Triple camera	Dual camera
Main camera
12 MP (OIS, PDAF) Aperture size: F1.8 Focal length: 26 mm Sensor size: 1/1.76" Pixel size: 1.8 μm	48 MP (PDAF) Aperture size: F1.8 Focal length: 26mm (wide) mm Sensor size: 1/2.3" Pixel size: 0.8 μm
Second camera
12 MP (Ultra-wide, Autofocus) Aperture size: F2.2 Focal Length: 13 mm Sensor size: 1/2.55" Pixel size: 1.4 μm	8 MP (Ultra-wide) Aperture size: F2.2 Sensor size: 1/1.4" Pixel size: 1.12 μm
Third camera
64 MP (Telephoto, OIS, PDAF) Aperture size: F2.0 Focal Length: 29 mm Sensor size: 1/1.7" Pixel size: 0.8 μm	2 MP (Macro) Aperture size: F2.4 Sensor size: 1/1.5" Pixel size: 1.75 μm
Fourth camera
	2 MP (Depth information) Aperture size: F2.4 Sensor size: 1/3.1" Pixel size: 1 μm
Flash
LED	LED
Video recording
8K UHD (24 fps), 4K UHD (60 fps), 1080p (240 fps), 720p (960 fps) OIS, HDR, Hyperlapse, Continuous autofocus, Video light, EIS	1080p (30 fps) HDR, Time-lapse video, EIS
Front
10 MP (PDAF, HDR) Video capture: 4K UHD (60 fps)	16 MP Video capture: 720p (30 fps)

Connectivity & Features

Bluetooth
5.0	4.2
WLAN
a,b,g,n,ac,Wi-Fi 6,dual-band MIMO, Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac, ax	b,g,n,ac Wi-Fi Direct, Hotspot 802.11 b, g, n, ac
USB
Type-C, USB 3.2	Type-C, USB 2.0
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers), Barometer, Ambient light sensor, Proximity sensor	Accelerometer, Gyroscope, Ambient light sensor, Proximity sensor
Hearing aid compatible
M3/T3
Location
GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning	GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
Other
NFC, ANT+

Multimedia

Headphones
No 3.5mm jack	3.5mm jack
Speakers
Earpiece, Multiple speakers	Earpiece, Loudspeaker
Features
32-Bit DAC, Dolby Atmos, aptX, Dolby Digital, Dolby Digital Plus
Screen mirroring
	Wireless screen share
Radio
	FM
Additional microphone(s)
	Noise cancellation

Cellular

5G Bands
n2, n5, n12, n25, n41, n66, n71, n77, n260, n261, SA, NSA, Sub-6, mmWave
4G (FDD) Bands
1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71	1, 3, 5, 7, 8
4G (TDD) Bands
38, 39, 40, 41, 46, 48	38, 40, 41
3G Bands
1, 2, 4, 5, 8	1, 5, 8
Data Speed
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS	LTE, HSDPA+ (4G) 42.2 Mbit/s
Dual SIM
	No
SIM type
Nano SIM	Nano SIM

Regulatory Approval

FCC approval
Date approved: Dec 08, 2020 FCC ID value: A3LSMG991U
Measured SAR
Head: 0.36 W/kg Body: 1.08 W/kg Simultaneous Transmission: 3.96 W/kg Wireless Router: 1.09 W/kg Phablet: 2.49 W/kg

Alternative variants

with 256GB storage


Memory	256GB

Comes with 8GB RAM


Memory	8GB

for Europe


System chip	Samsung Exynos 2100 (5 nm)
Processor	Octa-core 2900 MHz 1x2.91GHz Cortex-X1 3x2.81GHz Cortex-A78 4x2.2GHz Cortex-A55
GPU	Mali G78 MP14
Weight	5.96 oz (169.0 g)
5G Bands	SA, NSA, Sub-6
FCC approval	Date approved: Dec 18, 2020 FCC ID value: A3LSMG991B
Measured SAR	Head: 0.42 W/kg Body: 0.94 W/kg Simultaneous Transmission: 3.96 W/kg Wireless Router: 1.34 W/kg Phablet: 2.37 W/kg

Links

Full specifications
Samsung Galaxy S21 Specs	OPPO A91 Specs
PhoneArena Review
Samsung Galaxy S21 Review
User Reviews
Samsung Galaxy S21 User Reviews