Vivo X21 vs Vivo V9 vs Samsung Galaxy A8 (2018) comparison

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ratings
Overall NDTV RatingRead ReviewRead Review--
Design Rating--
Display Rating--
Software Rating--
Performance Rating--
Battery Life Rating--
Camera Rating--
Value for Money Rating--
key specs
Display6.28-inch6.30-inch5.60-inch-
Processor2.2GHz octa-core2.2GHz octa-core1.6GHz octa-core-
Front Camera12-megapixel 24-megapixel 16-megapixel-
Resolution1080x2280 pixels1080x2280 pixels1080x2220 pixels-
RAM6GB4GB4GB-
OSAndroid 8.1Android 8.1Android 7.1.1-
Storage128GB64GB32GB-
Rear Camera12-megapixel + 5-megapixel 16-megapixel + 5-megapixel16-megapixel-
Battery Capacity3200mAh3260mAh3000mAh-
general
Release dateMarch 2018March 2018December 2017-
Launched in IndiaYesYes--
Form factorTouchscreenTouchscreenTouchscreen-
Dimensions (mm)154.50 x 74.80 x 7.40154.80 x 75.00 x 7.90149.20 x 70.60 x 8.40-
Weight (g)156.20150.00172.00-
Battery capacity (mAh)320032603000-
Removable batteryNoNo--
Fast chargingProprietary---
ColoursBlack, GoldPearl Black, GoldBlack, Orchid Grey, Gold, Blue-
SAR value-1.38--
display
Screen size (inches)6.286.305.60-
TouchscreenYesYesYes-
Resolution1080x2280 pixels1080x2280 pixels1080x2220 pixels-
Aspect ratio19:919:9--
hardware
Processor2.2GHz octa-core2.2GHz octa-core1.6GHz octa-core-
Processor makeQualcomm Snapdragon 660Snapdragon 626--
RAM6GB4GB4GB-
Internal storage128GB64GB32GB-
Expandable storageYesYesYes-
Expandable storage typemicroSDmicroSDmicroSD-
Expandable storage up to (GB)256256256-
camera
Rear camera12-megapixel (f/1.8, 1.4-micron) + 5-megapixel (f/2.4)16-megapixel (f/2.0) + 5-megapixel16-megapixel-
Rear autofocusPhase detection autofocusPhase detection autofocus--
Rear flashLEDDual LEDLED-
Front camera12-megapixel (f/2.0)24-megapixel (f/2.0)16-megapixel-
software
Operating systemAndroid 8.1Android 8.1Android 7.1.1-
SkinFunTouch 4.0FunTouch OS 4.0--
connectivity
Wi-FiYesYesYes-
Wi-Fi standards supported802.11 a/b/g/n/ac-802.11 a/b/g/n/ac-
GPSYesYesYes-
BluetoothYes, v 5.00Yes, v 4.20Yes, v 5.00-
NFCNo-Yes-
InfraredNo---
USB OTGYesYes--
Micro-USBYesYes--
Headphones3.5mm3.5mm3.5mm-
FMNoYes--
Number of SIMs22--
sim 1
SIM TypeNano-SIMNano-SIM--
GSM/CDMAGSMGSM--
3GYesYes--
4G/ LTEYesYes--
sim 2
SIM TypeNano-SIMNano-SIM--
GSM/CDMAGSMGSM--
3GYesYes--
4G/ LTEYesYes--
sensors
Fingerprint sensorYesYes--
Compass/ MagnetometerYesYesYes-
Proximity sensorYesYesYes-
AccelerometerYesYesYes-
Ambient light sensorYesYes--
GyroscopeYesYesYes-
Face unlock-Yes--
Barometer--Yes-