Vivo Y91 vs Xiaomi Redmi 6A vs Xiaomi Redmi 4 Prime vs Xiaomi Redmi Note 4 comparison

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key specs
Display6.22-inch5.45-inch5.00-inch5.50-inch
ProcessorMediaTek Helio P22 MediaTek Helio A22 Qualcomm Snapdragon 625Qualcomm Snapdragon 625
Front Camera8-megapixel 5-megapixel5-megapixel5-megapixel
Rear Camera13-megapixel + 2-megapixel 13-megapixel 13-megapixel13-megapixel
RAM2GB2GB3GB4GB
Storage32MB16GB32GB64GB
Battery Capacity4030mAh3000mAh4100mAh4100mAh
OSAndroid 8.1Android 8.1 OreoAndroid 6.0Android 6.0
Resolution720x1520 pixels720x1440 pixels1080x1920 pixels1080x1920 pixels
general
BrandVivoXiaomiXiaomiXiaomi
ModelY91Redmi 6ARedmi 4 PrimeRedmi Note 4
Release dateJanuary 1, 2019June 1, 2018November 1, 2016August 1, 2016
Launched in IndiaYesYes-Yes
Form factorTouchscreenTouchscreenTouchscreenTouchscreen
Dimensions (mm)155.11 x 75.09 x 8.28147.50 x 71.50 x 8.30141.30 x 69.60 x 8.90151.00 x 76.00 x 8.30
Weight (g)163.50145.00156.00175.00
Battery capacity (mAh)4030300041004100
ColoursStarry Black, Ocean BlueBlue, Gold, Rose Gold, BlackGold, Grey, SilverGold, Grey, Matte Black
Body type-Plastic--
Removable battery-NoNoNo
Wireless charging-No--
display
Screen size (inches)6.225.455.005.50
TouchscreenYesYesYesYes
Resolution720x1520 pixels720x1440 pixels1080x1920 pixels1080x1920 pixels
Aspect ratio-18:9-16:9
Pixels per inch (PPI)-295443401
hardware
Processorocta-core2GHz quad-core (4x2GHz)2GHz octa-core2GHz octa-core
Processor makeMediaTek Helio P22 (MT6762R)MediaTek Helio A22 (MT6761)Qualcomm Snapdragon 625Qualcomm Snapdragon 625
RAM2GB2GB3GB4GB
Internal storage32MB16GB32GB64GB
Expandable storageYesYesYesYes
Expandable storage typemicroSDmicroSDmicroSDmicroSD
Expandable storage up to (GB)256256128128
Dedicated microSD slotYesYes--
camera
Rear camera13-megapixel (f/f/2.2) + 2-megapixel (f/f/2.4)13-megapixel (f/2.2)13-megapixel13-megapixel (f/2.0, 1.12-micron)
Rear flashLEDLEDDual LEDDual LED
Front camera8-megapixel (f/f/1.8)5-megapixel5-megapixel5-megapixel (f/2.0)
Front flashNoNo--
Rear autofocus-Phase detection autofocus-Phase detection autofocus
software
Operating systemAndroid 8.1Android 8.1 OreoAndroid 6.0Android 6.0
SkinFuntouch OS 4.5MIUI 9.6MIUI 8MIUI 8
connectivity
Wi-FiYesYesYesYes
BluetoothYes, v 5.00Yes, v 4.20Yes, v 4.20Yes, v 4.10
NFCNoNoNoNo
Micro-USBYesYes-Yes
Headphones3.5mm3.5mm3.5mm3.5mm
Number of SIMs2222
Active 4G on both SIM cardsYesYes--
Wi-Fi standards supported-802.11 b/g/n802.11 a/b/g/n802.11 a/b/g/n
GPS-YesYesYes
Infrared-NoNoYes
USB OTG-YesNoYes
USB Type-C-No--
FM-YesNoYes
Wi-Fi Direct--NoNo
Mobile High-Definition Link (MHL)--NoNo
sim 1
SIM TypeNano-SIMNano-SIMMicro-SIMMicro-SIM
GSM/CDMAGSMGSMGSMGSM
3GYesYesYesYes
4G/ LTEYesYesYesYes
sim 2
SIM TypeNano-SIMNano-SIMNano-SIMNano-SIM
GSM/CDMAGSMGSMGSMGSM
3GYesYesYesYes
4G/ LTEYesYesYesYes
sensors
Face unlockYesYes--
Fingerprint sensorYesNo-Yes
Compass/ MagnetometerYesYesNoYes
Proximity sensorYesYesYesYes
AccelerometerYesYesYesYes
Ambient light sensorYesYesYesYes
GyroscopeYesNoYesYes
Barometer--NoNo
Temperature sensor--NoNo
ratings
Overall NDTV Rating-Read Review-Read Review
Design Rating--
Display Rating--
Software Rating--
Performance Rating--
Battery Life Rating--
Camera Rating--
Value for Money Rating--

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