Oppo R9 Plus vs Xiaomi Redmi 3 vs Vivo Y51 comparison

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key specs
Display6.00-inch5.00-inch5.00-inch-
Processor1.8GHz octa-core1.2GHz octa-core1.2GHz quad-core-
Front Camera16-megapixel5-megapixel5-megapixel-
Resolution1080x1920 pixels720x1280 pixels540x960 pixels-
RAM4GB2GB2GB-
OSAndroid 5.1AndroidAndroid 5.0.2-
Storage64GB16GB16GB-
Rear Camera16-megapixel13-megapixel8-megapixel-
Battery Capacity4120mAh4100mAh2350mAh-
general
Release dateMarch 2016January 2016November 2015-
Form factorTouchscreenTouchscreenTouchscreen-
Dimensions (mm)163.10 x 80.70 x 7.40139.30 x 69.60 x 8.50143.80 x 71.70 x 7.52-
Weight (g)185.00144.00157.00-
Battery capacity (mAh)412041002350-
Removable batteryNoNoNo-
Colours--White-
display
Screen size (inches)6.005.005.00-
TouchscreenYesYesYes-
Resolution1080x1920 pixels720x1280 pixels540x960 pixels-
Pixels per inch (PPI)367---
hardware
Processor1.8GHz octa-core1.2GHz octa-core1.2GHz quad-core-
Processor makeQualcomm Snapdragon 652 (MSM8976)Qualcomm Snapdragon 616--
RAM4GB2GB2GB-
Internal storage64GB16GB16GB-
Expandable storageYesYesYes-
Expandable storage typemicroSDmicroSDmicroSD-
Expandable storage up to (GB)128128128-
camera
Rear camera16-megapixel13-megapixel8-megapixel-
Rear flashLEDYesLED-
Front camera16-megapixel5-megapixel5-megapixel-
software
Operating systemAndroid 5.1AndroidAndroid 5.0.2-
SkinColorOS 3.0MIUI 7FunTouch OS-
connectivity
Wi-FiYesYesYes-
GPSYesYesYes-
BluetoothYesYes, v 4.10Yes-
NFCNoNoNo-
InfraredNoYesNo-
USB OTGYesYesNo-
Headphones3.5mm3.5mm3.5mm-
FMNoYesYes-
Number of SIMs222-
Wi-Fi standards supported-802.11 b/g/n--
sim 1
SIM TypeMicro-SIMMicro-SIMMicro-SIM-
GSM/CDMAGSMGSMGSM-
3GYesYesYes-
4G/ LTEYesYesYes-
sim 2
SIM TypeMicro-SIMNano-SIMMicro-SIM-
GSM/CDMAGSMGSMGSM-
3GYesYesNo-
4G/ LTEYesYesYes-
sensors
Compass/ MagnetometerNoYesNo-
Proximity sensorYesYesYes-
AccelerometerYesYesYes-
Ambient light sensorYesYesYes-
GyroscopeYesYesYes-
BarometerNoNoNo-
Temperature sensorNoNoNo-