Compare Oppo A91 VS Samsung Galaxy A51

Samsung Galaxy A51 features with Exynos 7 Octa 9611 SoC, 4 GB + 64 GB or 6 GB + 128 GB or 8 GB + 128 GB, 6.5" Super AMOLED display, 4000 mAh battery with 15 W fast charging, quad rear camera with 48 MP main sensor + 12 MP ultra-wide + 5 MP depth-sensing and 5 MP macro and 32 MP front camera.

While Oppo A91 is equipped with Helio P70 SoC, 8 GB RAM, 128 GB memory, 6.4" AMOLED display, 4025 mAh battery with 30W fast charging, quad rear camera with 48 MP main sensor + 8 MP ultra-wide + 2 MP macro and 2 MP depth-sensing, 16 MP front camera, and 281 $ price on launch.

Here’s an in-depth specifications comparison between Oppo a91 and Samsung Galaxy A51.

Jump to:

1. Operating System  Comparison
2. System  on  Chip (SOC)  Comparison
3. RAM Comparison
4. Storage  Comparison
5. Display Comparison
6. Launch Date Comparison
7. Price  Comparison
8. Sensors  Comparison
9. Rear Camera Comparison
10. Front Camera Comparison
11. Tracking /  Positioning  Comparison
12. Wi-Fi  Comparison
13. Bluetooth  Comparison
14. USB Comparison
15. Connectivity  Comparison
16. Audio File Formats /  Codecs Comparison
17. Video File Formats /  Codecs Comparison
18. Battery  Comparison
19. Design  Comparison 
20. SIM Card  Comparison
21. Networks  Comparison
22. Mobile Network Technology and Bandwidth Comparison

Oppo A91	Samsung Galaxy A51
Brand and Model	Brand and Model
Brand	Brand
OPPO	Samsung
Model	Model
A91	Galaxy A51
Model Alias	Model Alias
PCPM00
PCPT00
A91 Operating System (OS)	Galaxy A51 Operating System
ColorOS 6.1 (Android 9.0 Pie)	Android 10
User Interface (UI)	User Interface (UI)
	One UI 2.0
A91 System on  Chip (SOC)	Galaxy A51 System on  Chip (SOC)
SOC	SOC
Media Tek Helio P70 (MT6771V/CT)	Samsung Exynos 7 Octa 9611
Process Technology	Process Technology
12 nm	10 nm
CPU	CPU
4x 2.1 GHz ARM Cortex-A73	4x 2.3 GHz ARM Cortex-A73
4x 2.0 GHz ARM Cortex-A53	4x 1.7 GHz ARM Cortex-A53
CPU Bits	CPU Bits
64 bits	64 bits
Instruction Set	Instruction Set
ARMv8-A	ARMv8-A
CPU Frequency	CPU Frequency
2100 MHz	2300 MHz
CPU Cores	CPU Cores
8	8
GPU	GPU
ARM Mali-G72 MP3	ARM Mali-G72 MP3
GPU Cores	GPU Cores
3	3
GPU Frequency	GPU Frequency
900 MHz
A91 RAM Capacity	Galaxy A51 RAM Capacity
	4 GB
	6 GB
8 GB	8 GB
RAM Type	RAM Type
LPDDR4X	LPDDR4X
RAM Channels	RAM Channels
Double Channel	Double channel
RAM Frequency	RAM Frequency
1866 MHz
Other Features	Other Features
Game Boost 2.0
A91 Storage	Galaxy A51 Storage
	64 GB
128 GB	128 GB
A91 Memory Cards	Galaxy A51 Memory Cards
microSD	microSD
microSDHC	microSDHC
microSDXC	microSDXC
A91 Display	Galaxy A51 Display
Type / Technology	Type / Technology
AMOLED	Super AMOLED
Diagonal Size	Diagonal Size
6.4 in	6.5 in
162.56 mm	165.1 mm
16.26 cm	16.51 cm
Width	Width
2.63 in	2.72 in
66.71 mm	69.19 mm
6.67 cm	6.92 cm
Height	Height
5.84 in	5.9 in
148.24 mm	149.9 mm
14.82 cm	14.99 cm
Aspect Ratio	Aspect Ratio
2.222:1	2.167:1
Resolution	Resolution
1080 x 2400  pixels	1080 x 2340 pixels
Pixel Density	Pixel Density
411 ppi	396 ppi
161 ppcm	155 ppcm
Color Depth	Color Depth
24 bits	24 bits
16777216 colors	16777216 colors
Display Area	Display Area
84.49 %	89.19 %
Other Features	Other Features
Capacitive	Capacitive
Multi-touch	Multi-touch
Scratch resistant	Scratch resistant
A91 Sensors	Galaxy A51 Sensors
Proximity	Proximity
Light	Light
Accelerometer	Accelerometer
Compass	Compass
Gyroscope	Gyroscope
Fingerprint	Fingerprint
In-display fingerprint sensor	In-display fingerprint sensor
Gravity
A91 Rear Camera	Galaxy A51 Rear Camera
Sensor Model	Sensor Model
	Samsung S5KGM2
Sensor Type	Sensor type
	ISOCELL
Aperture	Aperture
f/1.8	f/2
Flash Type	Flash Type
Dual LED	LED
Image Resolution	Image Resolution
8000 x 6000  pixels	8000 x 6000 pixels
48 MP	48 MP
Video resolution	Video resolution
3840 x 2160 pixels	1920 x 1080 pixels
8.29 MP	2.07 MP
Video FPS	Video FPS
30 fps	30 fps
Features	Features
Autofocus	Autofocus
	Continuous shooting
	Digital zoom
	Digital image stabilization
Geotagging	Geotagging
Panorama	Panorama
HDR	HDR
Touch focus	Touch focus
Face detection	Face detection
White balance setting	White balance setting
ISO setting	ISO setting
Exposure compensation	Exposure compensation
Self-timer	Self-timer
Scene mode	Scene mode
Macro mode
	Sensor size-1/2.25”
Pixel size- 0.8 um
Pixel size- 1.6 um (4-in-1 pixel binning)	Pixel size- 1.6 um (4-in-1 pixel binning)
Phase detection autofocus (PDAF)	Phase detection autofocus (PDAF)
6-elemet lens	6-element lens
	Sensor type- ISOCELL Plus
Secondary rear camera- 8 MP Hynix HI846 (ultra-wide)	Secondary rear camera - 12 MP (ultra-wide)
	Aperture size - f/2.2 (#2)
	Pixel size- 1.12 um (#2)
5-element lens (#2)
Angle of view- 119 degree (#2)
Third rear camera- 2 MP (depth-sensing)	Third rear camera - 5 MP (depth-sensing)
	Aperture size - f/1.12 (#3)
3-elemet lens (#3)
Fourth rear camera- 2 MP (macro)	Fourth Rear Camera-5 MP (macro)
	Aperture size- f/2.4 (#4)
3-element lens (#4)
A91 Front Camera	Galaxy A51 Front Camera
Sensor Model	Sensor Model
	Samsung S5KGD1
Sensor Type	Sensor Type
	ISOCELL
Aperture	Aperture
f/2	f/2.2
Image Resolution	Image Resolution
4608 x 3456 pixels	6560 x 4928 pixels
15.93 MP	32.33 MP
Video Resolution	Video Resolution
1920 x 1080 pixels	1920 x 1080 pixels
2.07 MP	2.07 MP
Video FPS	Video FPS
30 fps	30 fps
Features	Features
	Sensor size-1/2.8”
	Pixel size- 0.8 um
	Sensor type- ISOCELL
	Face unlock
A91 Audio	Galaxy A51 Audio
Loudspeaker	Loudspeaker
Earpiece	Earpiece
A91 Radio	Galaxy A51 Radio
Yes	Yes
A91 Tracking /  Positioning	Galaxy A51 Tracking /  Positioning
GPS	GPS
A-GPS	A-GPS
GLONASS	GLONASS
BeiDou	BeiDou
	Galileo
A91 Wi-Fi	Galaxy A51 Wi-Fi
802.11a (IEEE 802.11a-1999)	802.11a (IEEE 802.11a-1999)
802.11b (IEEE 802.11b-1999)	802.11b (IEEE 802.11b-1999)
802.11g (IEEE 802.11g-2003)	802.11g (IEEE 802.11g-1999)
802.11n (IEEE 802.11n-2009)	802.11n (IEEE 802.11n-2003)
802.11n 5GHz	802.11n 5GHz
802.11 ac (IEEE 802.11ac)	802.11ac (IEEE 802.11ac)
Dual band	Dual band
Wi-Fi Hotspot	Wi-Fi Hotspot
Wi-Fi Direct	Wi-Fi Direct
Wi-Fi Display	Wi-Fi Display
A91 Bluetooth	Galaxy A51 Bluetooth
Version	Version
5.0	5.0
Features	Features
A2DP	A2DP
LE	AVRCP
	DIP
	HFP
	HID
	HSP
	MAP
	OPP
	PAN
	PBAP/PAB
	HOGP
A91 USB	Galaxy A51 USB
Connector Type	Connector Type
USB Type-C	USB Type-C
Version	Version
2.0	2.0
Features	Features
Charging	Charging
Mass Storage	Mass Storage
On-The-Go	On-The-Go
A91 Headphone Jack	Galaxy A51 Headphone Jack
Yes	Yes
A91 Connectivity	Galaxy A51 Connectivity
Computer sync	Computer sync
OTA sync	OTA sync
Tethering	Tethering
VoLTE	VoLTE
	ANT+
A91 Browser	Galaxy A51 Browser
HTML	HTML
HTML5	HTML5
CSS 3	CSS 3
A91 Audio File Formats /  Codecs	Galaxy A51 Audio File Formats /  Codecs
AAC	AAC
AAC+ / aaPlus / HE-AAC v1
AMR / AMR-NB / GSM-AMR	AMR / AMR-NB / GSM-AMR
AMR-WB	AMR-WB
eAAC+ / aacPlus v2 / HE-AAC v2	eAAC+ / aacPlus v2 / HE-AAC v2
FLAC	FLAC
	M4A
MIDI	MIDI
MP3
OGG	OGG
WMA	WMA
WAV	WAV
A91 Video File Formats /  Codecs	Galaxy A51 Video File Formats /  Codecs
3GPP	3GPP
	3GPP2
AVI	AVI
DivX	DivX
Flash Video	Flash Video
H.263	H.263
H.264 / MPEG-4 Part 10 / AVC video	H.264 / MPEG-4 Part 10 / AVC video
	H.265 / MPEG-H Part 2 / HEVC
MP4	MP4
MKV	MKV
	VC-1
	VP8
	VP9
WebM	WebM
MWV	WMV
	WMV7
	WMV8
Xvid	Xvid
A91 Battery	Galaxy A51 Battery
Capacity	Capacity
4025 mAh	4000 mAh
Type	Type
Li-Polymer	Li-Polymer
Features	Features
Non-removable	Non-removable
Fast charging	Fast charging
Charger Output Power	Charger Output Power
5 V / 2 A	5 V / 2 A
	9 V / 1.67 A
Quick Charge Technology	Quick Charge Technology
VOOC 3.0
A91 Launch	Launch
Announced	Announced
2019, 20th December	2019, 13th December
Status	Status
Release 20th December 2019	Release December 2019
A91 Price	Galaxy A51 Price
8 GB + 128 GB = 285 $	-
A91 Design	Galaxy A51 Design
Colors	Colors
Dark Night	Prism Crush Black
Modern Bright Red	Prism Crush Blue
White-Blue-Purple gradient	Prism Crush Pink
	Prism Crush White
Width	Width
73.3 mm	73.6 mm
7.33 cm	7.36 cm
0.24 ft	0.24 ft
2.89 in	2.9 in
Height	Height
160.2 mm	158.5 mm
16.02 cm	15.85 cm
0.53 ft	0.52 ft
6.31 in	6.24 in
Thickness	Thickness
7.9 mm	7.9 mm
0.79 cm	0.79 cm
0.03 ft	0.03 ft
0.31 in	0.31 in
Weight	Weight
172 g	172 g
0.38 Ibs	0.38 lbs
6.07 oz	6.07 oz
Volume	Volume
92.77 cm3	92.16 cm3
5.63 in3	5.6 in3
Body Materials	Body Materials
Aluminium alloy	Plastic
Glass
A91 SIM Card	Galaxy A51 SIM Card
SIM Card Type	SIM Card Type
Nano-SIM (4FF-fourth form factor, since 2012, 12.30 x 8.80 x 0.67 mm)	Nano-SIM (4FF-fourth form factor, since 2012, 12.30 x 8.80 x 0.67 mm)
Nano-SIM / microSD
Number of SIM Cards	Number of SIM Cards
2	2
Features	Features
Dual SIM stand-by	Dual SIM stand-by
A91 Mobile Network Technology and Bandwidth	Galaxy A51 Mobile Network Technology and Bandwidth
UMTS (384 kbit/s)	UMTS (384 kbit/s)
EDGE	EDGE
GPRS	GPRS
HSPA+	HSPA+
LTE	LTE Cat 12 (102.0 Mbit/s, 603.0 Mbit/s)
TD-SCDMA
A91 Networks	Galaxy A51 Networks
GSM	GSM
GSM 850 MHz (B5)	GSM 850 MHz (B5)
GSM 900 MHz (B8)	GSM 900 MHz (B8)
GSM 1800 MHz (B3)	GSM 1800 MHz (B3)
GSM 1900 MHz (B2)	GSM 1900 MHz (B2)
CDMA
CDMA 800 MHz (BC0)
W-CDMA	UMTS
W-CDMA 850 MHz (B5)	UMTS 850 MHz (B5)
W-CDMA 900 MHz (B8)	UMTS 900 MHz (B8)
	UMTS 1900 MHz (B2)
W-CDMA 2100 MHz (B1)	UMTS 2100 MHz (B1)
TD-SCDMA
TD-SCDMA 1880-1920 MHz
TD-SCDMA 1880-1920 MHz
LTE	LTE
LTE-FDD 850 MHz (B5)	LTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)	LTE-FDD 900 MHz (B8)
	LTE-FDD 1800 MHz (B3)
LTE-FDD 2100 MHz (B1)	LTE-FDD 2100 MHz (B1)
	LTE-FDD 2600 MHz (B7)
LTE-TDD 1900 MHz (B39)
LTE-TDD 2300 MHz (B40)
LTE-TDD 2500 MHz (B41)