Comparison between:
- Xiaomi Redmi Note 9 Pro
- Samsung Galaxy A31
- Oppo Reno2 Z
- Oppo A91

Brand and model

Information about the brand, model and model alias (if any) of a specific device.

Xiaomi Redmi Note 9 ProSamsung Galaxy A31Oppo Reno2 ZOppo A91
Xiaomi Redmi Note 9 Pro
Prices
Samsung Galaxy A31
Prices
Oppo Reno2 ZOppo A91
Model aliasRedmi Note9 Pro
Red Rice Note 9 Pro
Red Rice Note9 Pro
SM-A315FReno 2 Z
CPH1945
CPH1951
PCPM00
PCPT00

Design

Information about the dimensions and weight of the device, shown in different measurement units. Body materials, available colors, certifications.

Width76.68 mm
7.668 cm
0.252 ft
3.019 in
73.1 mm
7.31 cm
0.24 ft
2.878 in
75.8 mm
7.58 cm
0.249 ft
2.984 in
73.3 mm
7.33 cm
0.24 ft
2.886 in
Height165.75 mm
16.575 cm
0.544 ft
6.526 in
159.3 mm
15.93 cm
0.523 ft
6.272 in
161.8 mm
16.18 cm
0.531 ft
6.37 in
160.2 mm
16.02 cm
0.526 ft
6.307 in
Thickness8.8 mm
0.88 cm
0.029 ft
0.346 in
8.6 mm
0.86 cm
0.028 ft
0.339 in
8.67 mm
0.867 cm
0.028 ft
0.341 in
7.9 mm
0.79 cm
0.026 ft
0.311 in
Weight209 g
0.46 lbs
7.37 oz
185 g
0.41 lbs
6.53 oz
195 g
0.43 lbs
6.88 oz
172 g
0.38 lbs
6.07 oz
Volume111.85 cm³
6.79 in³
100.15 cm³
6.08 in³
106.33 cm³
6.46 in³
92.77 cm³
5.63 in³
ColorsGlacier White
Interstellar Black
Tropical Green
Prism Crush Black
Prism Crush Blue
Prism Crush Red
Prism Crush White
Sky White
Luminous Black
Dark Knight
Modern Bright Red
White-Blue-Purple gradient
Body materialsGlass
Plastic
PlasticAluminium alloy
Glass
Glass
Aluminium alloy

SIM card

The Subscriber Identity Module (SIM) is used in mobile devices for storing data authenticating the subscribers of mobile services.

SIM card typeNano-SIMNano-SIMNano-SIM
Nano-SIM / microSD
Nano-SIM
Nano-SIM / microSD
Number of SIM cards2222
FeaturesDual SIM stand-by (Both cards are active. When one is busy, the other is not active)Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)

Networks

A mobile (cellular) network is a radio system, which allows a large number of mobile devices to communicate with each other.

GSMGSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
GSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
GSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
GSM 850 MHz (B5)
GSM 900 MHz (B8)
GSM 1800 MHz (B3)
GSM 1900 MHz (B2)
CDMACDMA 800 MHz (BC0)--CDMA 800 MHz (BC0)
W-CDMAW-CDMA 850 MHz (B5)
W-CDMA 900 MHz (B8)
W-CDMA 1900 MHz (B2)
W-CDMA 2100 MHz (B1)
-W-CDMA 850 MHz (B5)
W-CDMA 900 MHz (B8)
W-CDMA 2100 MHz (B1)
W-CDMA 850 MHz (B5)
W-CDMA 900 MHz (B8)
W-CDMA 2100 MHz (B1)
TD-SCDMA---TD-SCDMA 1880-1920 MHz
TD-SCDMA 2010-2025 MHz
UMTS-UMTS 850 MHz (B5)
UMTS 900 MHz (B8)
UMTS 1900 MHz (B2)
UMTS 2100 MHz (B1)
--
LTELTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1800 MHz (B3)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)
LTE-TDD 2300 MHz (B40)
LTE-TDD 2500 MHz (B41)
LTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1900 MHz (B25)
LTE-FDD 2100 MHz (B1)
LTE-FDD 2600 MHz (B7)
LTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
LTE-FDD 1800 MHz (B3)
LTE-FDD 2100 MHz (B1)
LTE-TDD 2300 MHz (B40)
LTE-TDD 2500 MHz (B41)
LTE-TDD 2600 MHz (B38)
LTE-FDD 850 MHz (B5)
LTE-FDD 900 MHz (B8)
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)

Mobile network technologies and bandwidth

Communication between devices within mobile networks is realized via various generations of network technologies, which provide different bandwidth.

Mobile network technologiesUMTS
EDGE
GPRS
HSPA+
LTE Cat 12
EV-DO Rev. A
TD-SCDMA
TD-HSDPA
UMTS
EDGE
GPRS
HSPA+
LTE Cat 10
EDGE
GPRS
HSPA+
LTE Cat 13
EV-DO Rev. A
EDGE
GPRS
HSPA+
LTE
TD-SCDMA

Operating system

Operating system is the system software, which manages and controls the functioning of the hardware components of the device.

Operating system (OS)MIUI V11 (Android 10)Android 10ColorOS 6.1 (Android 9.0 Pie)ColorOS 6.1 (Android 9.0 Pie)
User interface (UI)-One UI 2.0--

System on Chip (SoC)

A system on a chip (SoC) includes into a single chip some of the main hardware components of the mobile device.

SoCQualcomm Snapdragon 720GMediaTek Helio G70MediaTek Helio P90 (MT6779)MediaTek Helio P70 (MT6771V/CT)
Process technology8 nm12 nm12 nm12 nm
CPU2x 2.3 GHz Kryo 465, 6x 1.8 GHz Kryo 4652x 2.0 GHz Cortex-A75, 6x 1.7 GHz Cortex-A552x 2.2 GHz ARM Cortex-A75, 6x 2.0 GHz ARM Cortex-A554x 2.1 GHz ARM Cortex-A73, 4x 2.0 GHz ARM Cortex-A53
CPU bits64 bit64 bit64 bit64 bit
Instruction setARMv8.2-AARMv8.2-AARMv8-AARMv8-A
CPU cores8888
CPU frequency2300 MHz2000 MHz2200 MHz2100 MHz
GPUQualcomm Adreno 618ARM Mali-G52 2EEMC2IMG 9XM-HP8 (PowerVR GM9446)ARM Mali-G72 MP3
GPU cores---3
GPU frequency750 MHz820 MHz970 MHz900 MHz
RAM capacity6 GB4 GB
6 GB
8 GB8 GB
RAM typeLPDDR4XLPDDR4XLPDDR4XLPDDR4X
RAM channelsDouble channelDouble channelDouble channelDouble channel
RAM frequency2133 MHz-1866 MHz1866 MHz
--Game Boost 2.0Game Boost 2.0

Storage

Every mobile device has a built-in storage (internal memory) with a fixed capacity.

Storage64 GB
128 GB
64 GB
128 GB
256 GB128 GB
UFS 2.1eMMC 5.1UFS 2.1-

Memory cards

Memory cards are used in mobile devices for expanding their external storage capacity.

TypesmicroSD
microSDHC
microSDXC
microSD
microSDHC
microSDXC
microSD
microSDHC
microSDXC
microSD
microSDHC
microSDXC

Display

The display of a mobile device is characterized by its technology, resolution, pixel density, diagonal length, color depth, etc.

Type/technologyIPSSuper AMOLEDAMOLEDAMOLED
Diagonal size6.67 in
169.42 mm
16.94 cm
6.4 in
162.56 mm
16.26 cm
6.5 in
165.1 mm
16.51 cm
6.4 in
162.56 mm
16.26 cm
Width2.74 in
69.52 mm
6.95 cm
2.63 in
66.71 mm
6.67 cm
2.67 in
67.75 mm
6.78 cm
2.63 in
66.71 mm
6.67 cm
Height6.08 in
154.5 mm
15.45 cm
5.84 in
148.24 mm
14.82 cm
5.93 in
150.56 mm
15.06 cm
5.84 in
148.24 mm
14.82 cm
Aspect ratio2.222:12.222:12.222:12.222:1
Resolution1080 x 2400 pixels1080 x 2400 pixels1080 x 2400 pixels1080 x 2400 pixels
Pixel density395 ppi
155 ppcm
411 ppi
161 ppcm
405 ppi
159 ppcm
411 ppi
161 ppcm
Color depth24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
24 bit
16777216 colors
Display area84.78 %85.2 %83.44 %84.49 %
Other featuresCapacitive
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
Capacitive
Multi-touch
Scratch resistant
2.5D curved glass screen
Corning Gorilla Glass 5
Oleophobic coating
TÜV Rheinland Low Blue Light Certification
1500:1 contrast ratio
450 cd/m² typical brightness
84% NTSC
Infinity-U Display
2.5D curved glass screen
On-cell
2.5D curved glass screen
Corning Gorilla Glass 5
60000:1 contrast ratio
430 cd/m²
-

Sensors

Different sensors measure different physical quantities and convert them into signals recognizable by the mobile device.

SensorsProximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Proximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Hall
Proximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Hall
Proximity
Light
Accelerometer
Compass
Gyroscope
Fingerprint
Gravity
Side-mounted fingerprint sensorIn-display fingerprint sensorIn-display fingerprint sensorIn-display fingerprint sensor

Rear camera

The primary camera of the mobile device is usually placed on its back and can be combined with one or more additional cameras.

Sensor model--Sony IMX586 Exmor RS-
Sensor typeCMOS-CMOS BSI-
Sensor format--1/2"-
Pixel size0.8 µm
0.000800 mm
0.8 µm
0.000800 mm
0.8 µm
0.000800 mm
0.8 µm
0.000800 mm
ISO--100 - 1600-
Aperturef/1.79f/2f/1.7f/1.8
Focal length and 35 mm equivalent--4.73 mm-
Number of lenses6-6-
Flash typeLEDLEDDual LEDDual LED
Image resolution64 MP8000 x 6000 pixels
48 MP
8000 x 6000 pixels
48 MP
8000 x 6000 pixels
48 MP
Video resolution3840 x 2160 pixels
8.29 MP
1920 x 1080 pixels
2.07 MP
3840 x 2160 pixels
8.29 MP
3840 x 2160 pixels
8.29 MP
Video FPS30 fps30 fps30 fps30 fps
FeaturesAutofocus
Digital zoom
Digital image stabilization
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Macro mode
Phase detection autofocus (PDAF)
Autofocus
Continuous shooting
Digital zoom
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Autofocus
Continuous shooting
Digital zoom
Digital image stabilization
Optical image stabilization
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Phase detection autofocus (PDAF)
Autofocus
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Self-timer
Scene mode
Macro mode
Phase detection autofocus (PDAF)
Sony IMX582 versions also available
Pixel size - 1.6 μm (4-in-1 pixel binning)
Secondary rear camera - 8 MP (ultra-wide)
Sensor model - OmniVision OV8856 (#2)
GalaxyCore GC8034 version also available(#2)
Sensor size - 1/4" (#2)
Pixel size - 1.12 μm (#2)
Aperture size - f/2.2 (#2)
Angle of view - 118° (#2)
Focal length (35 mm equivalent) - 13 mm (#2)
Third rear camera - 2MP (depth-sensing)
Sensor model - GalaxyCore GC02M1 (#3)
Sensor size - 1/5" (#3)
Pixel size - 1.75 μm (#3)
Aperture size - f/2.4 (#3)
Fourth rear camera - 5MP (macro)
Sensor model - Samsung S5K5E9 (#4)
Pixel size - 1.12 μm (#4)
2 cm shooting distance (#4)
Secondary rear camera - 8 MP (ultra-wide)
Aperture size - f/2.2 (#2)
Third rear camera - 5 MP (depth-sensing)
Aperture size - f/2.4 (#3)
Fourth rear camera - 5 MP (macro)
Aperture size - f/2.4 (#4)
Pixel size - 1.6 μm (4-in-1 pixel binning)
10x digital zoom
Secondary rear camera - 8 MP Hynix HI846 (ultra-wide)
Sensor size - 1/4" (#2)
Pixel size - 1.12 μm (#2)
Aperture - f/2.2 (#2)
Focal length - 1.66 mm (#2)
5-element lens (#2)
Thord rear camera - 2 MP GalaxyCore GC02M0 (depth-sensing)
Sensor size - 1/5" (#3)
Pixel size - 1.75 μm (#3)
Aperture - f/2.4 (#3)
Focal length - 1.77 mm (#3)
3-element lens (#3)
Fourth rear camera - 2 MP OmniVision OV02A1B (mono)
Sensor size - 1/5" (#4)
Pixel size - 1.75 μm (#4)
Aperture - f/2.4 (#4)
Focal length - 1.77 mm (#4)
3-element lens (#4)
Pixel size - 1.6 μm (4-in-1 pixel binning)
6-element lens
Secondary rear camera - 8 MP (ultra-wide angle)
Angle of view - 119° (#2)
5-element lens (#2)
Third rear camera - 2 MP (macro)
3-element lens (#3)
Fourth rear camera - 2 MP (depth-sensing)
3-element lens (#4)

Front camera

Modern smartphones have one or more front cameras and their positioning has led to various design concepts – pop-up camera, rotating camera, notch, punch hole, under-display camera, etc.

Sensor modelOmniVision OV16A1Q-Samsung S5K3P9SP-
Sensor type--ISOCELL-
Sensor format--1/3.1"-
Pixel size1 µm
0.001000 mm
-1 µm
0.001000 mm
-
Aperturef/2f/2.2f/2f/2
Field of view--79 °-
Number of lenses--5-
Image resolution4608 x 3456 pixels
15.93 MP
20 MP4608 x 3456 pixels
15.93 MP
4608 x 3456 pixels
15.93 MP
Video resolution1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
1920 x 1080 pixels
2.07 MP
Video FPS30 fps30 fps30 fps30 fps
FeaturesFace unlock
HDR
Face detection
Face unlock
HDR
Face unlock-
--Mechanical pop-up front camera-

Audio

Information about the type of speakers and the audio technologies supported by the device.

SpeakerLoudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece
Loudspeaker
Earpiece
Smart PA
Dual microphones with active noise cancellation
1216 linear speaker
Z-axis linear motor
-Active noise cancellation with a dedicated microphone-

Radio

The radio in a mobile device is a built-in FM radio receiver.

RadioYesYesNoYes

Tracking/Positioning

Information about the positioning and navigation technologies supported by the device.

Tracking/PositioningGPS
A-GPS
GLONASS
Galileo
Beidou
NavIC
GPS
A-GPS
GLONASS
BeiDou
GPS
A-GPS
GLONASS
BeiDou
GPS
A-GPS
GLONASS
BeiDou

Wi-Fi

Wi-Fi is a technology that provides wireless data connections between various devices within a short range.

Wi-Fi802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
Wi-Fi Display
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
Wi-Fi Display
802.11a
802.11b
802.11g
802.11n
802.11n 5GHz
802.11ac
Dual band
Wi-Fi Hotspot
Wi-Fi Direct
Wi-Fi Display
2x2 MU-MIMO---

Bluetooth

Bluetooth is a standard for secure wireless data transfer between different types of devices over short distances.

Version5.05.05.05.0
FeaturesA2DP
EDR
HID
LE
A2DP
AVRCP
DIP
HFP
HID
HSP
MAP
OPP
PAN
PBAP
HOGP
A2DP
EDR
LE
A2DP
LE

USB

The Universal Serial Bus (USB) is an industry standard that allows different electronic devices to exchange data.

Connector typeUSB Type-CUSB Type-CUSB Type-CUSB Type-C
Version2.02.02.02.0
FeaturesCharging
Mass storage
On-The-Go
Charging
Mass storage
On-The-Go
Charging
Mass storage
On-The-Go
Charging
Mass storage
On-The-Go

Headphone jack

The headphone jack is an audio phone connector, a.k.a. an audio jack. The most widely used one in mobile devices is the 3.5 mm headphone jack.

Headphone jackYesYesYesYes

Connectivity

Information about other important connectivity technologies supported by the devices.

ConnectivityComputer sync
OTA sync
Infrared
Tethering
NFC
VoLTE
ViLTE
VoWiFi
Computer sync
OTA sync
Tethering
NFC
VoLTE
Computer sync
OTA sync
Tethering
VoLTE
Computer sync
Tethering
VoLTE
-Availability of Samsung Pay Service (NFC or MST) may vary by country--

Browser

A web browser is a software application for accessing, fetching, displaying and navigating through information on the World Wide Web.

BrowserHTML
HTML5
CSS 3
HTML
HTML5
CSS 3
HTML
HTML5
CSS 3
HTML
HTML5
CSS 3

Audio file formats/codecs

Mobile devices support various audio file formats and codecs, which respectively store and code/decode digital audio data.

Audio file formats/codecsAAC
AAC+
AMR
AMR-WB
aptX
aptX HD
eAAC+
FLAC
MIDI
MP3
OGG
WMA
WAV
LDAC
AAC
AMR
AMR-WB
eAAC+
FLAC
M4A
MIDI
MP3
OGG
WMA
WAV
AAC
AAC+
AMR
eAAC+
FLAC
MIDI
MP3
OGG
WMA
WAV
APE
AAC
AAC+
AMR
AMR-WB
eAAC+
FLAC
MIDI
MP3
OGG
WMA
WAV

Video file formats/codecs

Mobile devices support various video file formats and codecs, which respectively store and code/decode digital video data.

Video file formats/codecs3GPP
AVI
DivX
H.263
H.264
H.265
MKV
MP4
VC-1
Xvid
3GPP
3GPP2
AVI
Flash Video
H.263
H.264
H.265
MKV
MP4
VC-1
VP8
VP9
WebM
WMV
WMV7
WMV8
Xvid
3GPP
AVI
DivX
Flash Video
MKV
MP4
WebM
WMV
Xvid
3GPP
AVI
DivX
Flash Video
H.263
H.264
MKV
MP4
WebM
WMV
Xvid

Battery

The batteries of mobile devices differ in capacity and technology. They provide the electrical charge needed for the functioning of the devices.

Capacity5020 mAh5000 mAh4000 mAh4025 mAh
TypeLi-IonLi-IonLi-PolymerLi-Polymer
Charger output power5 V / 6 A5 V / 2 A
9 V / 1.67 A
5 V / 4 A5 V / 4 A
Quick charge technology--VOOC 3.0VOOC 3.0
FeaturesFast charging
Non-removable
Fast charging
Non-removable
Fast charging
Non-removable
Fast charging
Non-removable
33W in-box charger---

Specific Absorption Rate (SAR)

The SAR rating shows the amount of electromagnetic radiation absorbed by the human body when using a mobile device, expressed in W/kg.

Head SAR (EU)-0.488 W/kg--
Body SAR (EU)-1.68 W/kg--

Additional features

Some devices have additional features, different from the standard ones above, but equally important and worth mentioning.

Additional featuresP2i splash-proof nano-coating-SAR:
India head - 1.183 W/kg
India body - 0.780 W/kg
-
 Xiaomi Redmi Note 9 ProSamsung Galaxy A31Oppo Reno2 ZOppo A91