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 Pro | Samsung Galaxy A31 | Oppo Reno2 Z | Oppo A91 | |
 Prices |  Prices |  |  | |
| Model alias | Redmi Note9 Pro Red Rice Note 9 Pro Red Rice Note9 Pro | SM-A315F | Reno 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.
| Width | 76.68 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 |
| Height | 165.75 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 |
| Thickness | 8.8 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 |
| Weight | 209 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 |
| Volume | 111.85 cm³ 6.79 in³ | 100.15 cm³ 6.08 in³ | 106.33 cm³ 6.46 in³ | 92.77 cm³ 5.63 in³ |
| Colors | Glacier 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 materials | Glass Plastic | Plastic | Aluminium 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 type | Nano-SIM | Nano-SIM | Nano-SIM Nano-SIM / microSD | Nano-SIM Nano-SIM / microSD |
| Number of SIM cards | 2 | 2 | 2 | 2 |
| Features | 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) | 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.
| GSM | 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) | GSM 850 MHz (B5) GSM 900 MHz (B8) GSM 1800 MHz (B3) GSM 1900 MHz (B2) |
| CDMA | CDMA 800 MHz (BC0) | - | - | CDMA 800 MHz (BC0) |
| W-CDMA | W-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) | - | - |
| LTE | LTE-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 technologies | UMTS 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 10 | ColorOS 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.
| SoC | Qualcomm Snapdragon 720G | MediaTek Helio G70 | MediaTek Helio P90 (MT6779) | MediaTek Helio P70 (MT6771V/CT) |
| Process technology | 8 nm | 12 nm | 12 nm | 12 nm |
| CPU | 2x 2.3 GHz Kryo 465, 6x 1.8 GHz Kryo 465 | 2x 2.0 GHz Cortex-A75, 6x 1.7 GHz Cortex-A55 | 2x 2.2 GHz ARM Cortex-A75, 6x 2.0 GHz ARM Cortex-A55 | 4x 2.1 GHz ARM Cortex-A73, 4x 2.0 GHz ARM Cortex-A53 |
| CPU bits | 64 bit | 64 bit | 64 bit | 64 bit |
| Instruction set | ARMv8.2-A | ARMv8.2-A | ARMv8-A | ARMv8-A |
| CPU cores | 8 | 8 | 8 | 8 |
| CPU frequency | 2300 MHz | 2000 MHz | 2200 MHz | 2100 MHz |
| GPU | Qualcomm Adreno 618 | ARM Mali-G52 2EEMC2 | IMG 9XM-HP8 (PowerVR GM9446) | ARM Mali-G72 MP3 |
| GPU cores | - | - | - | 3 |
| GPU frequency | 750 MHz | 820 MHz | 970 MHz | 900 MHz |
| RAM capacity | 6 GB | 4 GB 6 GB | 8 GB | 8 GB |
| RAM type | LPDDR4X | LPDDR4X | LPDDR4X | LPDDR4X |
| RAM channels | Double channel | Double channel | Double channel | Double channel |
| RAM frequency | 2133 MHz | - | 1866 MHz | 1866 MHz |
| - | - | Game Boost 2.0 | Game Boost 2.0 |
Storage
Every mobile device has a built-in storage (internal memory) with a fixed capacity.
| Storage | 64 GB 128 GB | 64 GB 128 GB | 256 GB | 128 GB |
| UFS 2.1 | eMMC 5.1 | UFS 2.1 | - |
Memory cards
Memory cards are used in mobile devices for expanding their external storage capacity.
| Types | microSD 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/technology | IPS | Super AMOLED | AMOLED | AMOLED |
| Diagonal size | 6.67 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 |
| Width | 2.74 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 |
| Height | 6.08 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 ratio | 2.222:1 | 2.222:1 | 2.222:1 | 2.222:1 |
| Resolution | 1080 x 2400 pixels | 1080 x 2400 pixels | 1080 x 2400 pixels | 1080 x 2400 pixels |
| Pixel density | 395 ppi 155 ppcm | 411 ppi 161 ppcm | 405 ppi 159 ppcm | 411 ppi 161 ppcm |
| Color depth | 24 bit 16777216 colors | 24 bit 16777216 colors | 24 bit 16777216 colors | 24 bit 16777216 colors |
| Display area | 84.78 % | 85.2 % | 83.44 % | 84.49 % |
| Other features | Capacitive 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.
| Sensors | Proximity 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 sensor | In-display fingerprint sensor | In-display fingerprint sensor | In-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 type | CMOS | - | CMOS BSI | - |
| Sensor format | - | - | 1/2" | - |
| Pixel size | 0.8 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 | - |
| Aperture | f/1.79 | f/2 | f/1.7 | f/1.8 |
| Focal length and 35 mm equivalent | - | - | 4.73 mm | - |
| Number of lenses | 6 | - | 6 | - |
| Flash type | LED | LED | Dual LED | Dual LED |
| Image resolution | 64 MP | 8000 x 6000 pixels 48 MP | 8000 x 6000 pixels 48 MP | 8000 x 6000 pixels 48 MP |
| Video resolution | 3840 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 FPS | 30 fps | 30 fps | 30 fps | 30 fps |
| Features | Autofocus 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 model | OmniVision OV16A1Q | - | Samsung S5K3P9SP | - |
| Sensor type | - | - | ISOCELL | - |
| Sensor format | - | - | 1/3.1" | - |
| Pixel size | 1 µm 0.001000 mm | - | 1 µm 0.001000 mm | - |
| Aperture | f/2 | f/2.2 | f/2 | f/2 |
| Field of view | - | - | 79 ° | - |
| Number of lenses | - | - | 5 | - |
| Image resolution | 4608 x 3456 pixels 15.93 MP | 20 MP | 4608 x 3456 pixels 15.93 MP | 4608 x 3456 pixels 15.93 MP |
| Video resolution | 1920 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 FPS | 30 fps | 30 fps | 30 fps | 30 fps |
| Features | Face 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.
| Speaker | Loudspeaker 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.
| Radio | Yes | Yes | No | Yes |
Tracking/Positioning
Information about the positioning and navigation technologies supported by the device.
| Tracking/Positioning | GPS 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-Fi | 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 | 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.
| Version | 5.0 | 5.0 | 5.0 | 5.0 |
| Features | A2DP 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 type | USB Type-C | USB Type-C | USB Type-C | USB Type-C |
| Version | 2.0 | 2.0 | 2.0 | 2.0 |
| Features | Charging 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 jack | Yes | Yes | Yes | Yes |
Connectivity
Information about other important connectivity technologies supported by the devices.
| Connectivity | Computer 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.
| Browser | HTML 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/codecs | AAC 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/codecs | 3GPP 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.
| Capacity | 5020 mAh | 5000 mAh | 4000 mAh | 4025 mAh |
| Type | Li-Ion | Li-Ion | Li-Polymer | Li-Polymer |
| Charger output power | 5 V / 6 A | 5 V / 2 A 9 V / 1.67 A | 5 V / 4 A | 5 V / 4 A |
| Quick charge technology | - | - | VOOC 3.0 | VOOC 3.0 |
| Features | Fast 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 features | P2i splash-proof nano-coating | - | SAR: India head - 1.183 W/kg India body - 0.780 W/kg | - |
| Xiaomi Redmi Note 9 Pro | Samsung Galaxy A31 | Oppo Reno2 Z | Oppo A91 |