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Vivo X21 vs Redmi Note 5 Pro vs Mi A1 vs Lenovo K8 Note comparison

 Compare Vivo X21
Vivo X21
Compare Redmi Note 5 Pro
Redmi Note 5 Pro
Compare Mi A1
Mi A1
Compare Lenovo K8 Note
Lenovo K8 Note
ratings
Overall NDTV RatingRead ReviewRead ReviewRead ReviewRead Review
Design Rating
Display Rating
Software Rating
Performance Rating
Battery Life Rating
Camera Rating
Value for Money Rating
key specs
Display6.28-inch5.99-inch5.50-inch5.50-inch
ProcessorQualcomm Snapdragon 660Qualcomm Snapdragon 636Qualcomm Snapdragon 625MediaTek Helio X23
Front Camera12-megapixel 20-megapixel 5-megapixel13-megapixel
Rear Camera12-megapixel + 5-megapixel 12-megapixel + 5-megapixel 12-megapixel13-megapixel
RAM6GB4GB4GB3GB
Storage128GB64GB64GB32GB
Battery Capacity3200mAh4000mAh3080mAh4000mAh
OSAndroid 8.1Android 7.1.1Android 7.1.2Android 7.1.1
Resolution1080x2280 pixels1080x2160 pixels1080x1920 pixels1080x1920 pixels
general
BrandVivoXiaomiXiaomiLenovo
ModelX21Redmi Note 5 ProMi A1K8 Note
Release dateMarch 1, 2018February 1, 2018September 1, 2017August 1, 2017
Launched in IndiaYesYesYes-
Form factorTouchscreenTouchscreenTouchscreenTouchscreen
Dimensions (mm)154.50 x 74.80 x 7.40158.60 x 75.40 x 8.05155.40 x 75.80 x 7.30154.50 x 75.90 x 8.50
Weight (g)156.20181.00165.00180.00
Battery capacity (mAh)3200400030804000
Removable batteryNoNoNoNo
Fast chargingProprietary---
ColoursBlack, GoldBlack, Gold, Lake Blue, Rose GoldRose Gold, Gold, BlackFine Gold, Venom Black
Body type-Metal--
SAR value-1.19--
display
Screen size (inches)6.285.995.505.50
TouchscreenYesYesYesYes
Resolution1080x2280 pixels1080x2160 pixels1080x1920 pixels1080x1920 pixels
Aspect ratio19:918:916:9-
Protection type-Gorilla Glass--
Pixels per inch (PPI)---441
hardware
Processor2.2GHz octa-core1.8GHz octa-core2GHz octa-core1.4GHz deca-core
Processor makeQualcomm Snapdragon 660Qualcomm Snapdragon 636Qualcomm Snapdragon 625MediaTek Helio X23 (MT6797D)
RAM6GB4GB4GB3GB
Internal storage128GB64GB64GB32GB
Expandable storageYesYesYesYes
Expandable storage typemicroSDmicroSDmicroSDmicroSD
Expandable storage up to (GB)256128128128
camera
Rear camera12-megapixel (f/1.8, 1.4-micron) + 5-megapixel (f/2.4)12-megapixel (f/2.2, 1.25-micron) + 5-megapixel (f/2.0, 1.12-micron)12-megapixel13-megapixel
Rear autofocusPhase detection autofocusPhase detection autofocus--
Rear flashLEDLEDDual LEDDual LED
Front camera12-megapixel (f/2.0)20-megapixel (f/2.2, 1.0-micron)5-megapixel13-megapixel
Front flash-LED-LED
software
Operating systemAndroid 8.1Android 7.1.1Android 7.1.2Android 7.1.1
SkinFunTouch 4.0MIUI 9--
connectivity
Wi-FiYesYesYesYes
Wi-Fi standards supported802.11 a/b/g/n/ac802.11 b/g/n/ac802.11 a/b/g/n/ac802.11 a/b/g/n/ac
GPSYesYesYesYes
BluetoothYes, v 5.00Yes, v 5.00Yes, v 4.20Yes, v 4.10
NFCNoNoNoNo
InfraredNoNoYesNo
USB OTGYesYesYesYes
Micro-USBYesYes--
Headphones3.5mm3.5mm3.5mm3.5mm
FMNoYesNoYes
Number of SIMs2222
Wi-Fi Direct-YesNoNo
Mobile High-Definition Link (MHL)-NoNoNo
USB Type-C--Yes-
sim 1
SIM TypeNano-SIMNano-SIMNano-SIMNano-SIM
GSM/CDMAGSMGSMGSMGSM
3GYesYesYesYes
4G/ LTEYesYesYesYes
sim 2
SIM TypeNano-SIMNano-SIMNano-SIMNano-SIM
GSM/CDMAGSMGSMGSMGSM
3GYesYesYesYes
4G/ LTEYesYesYesYes
sensors
Fingerprint sensorYesYesYes-
Compass/ MagnetometerYesYesYesYes
Proximity sensorYesYesYesYes
AccelerometerYesYesYesYes
Ambient light sensorYesYesYesYes
GyroscopeYesYesYesYes
Face unlock-Yes--
3D face recognition-No--
Barometer-NoNoNo
Temperature sensor-NoNoNo
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