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Vivo Z1 vs Vivo X21i vs Oppo R15 comparison

 Compare Vivo Z1
Vivo Z1
Compare Vivo X21i
Vivo X21i
Compare Oppo R15
Oppo R15
key specs
Display6.26-inch6.28-inch6.28-inch
ProcessorQualcomm Snapdragon 660MediaTek Helio P60 MediaTek Helio P60
Front Camera12-megapixel24-megapixel20-megapixel
Rear Camera13-megapixel12-megapixel16-megapixel
RAM4GB4GB6GB
Storage16GB64GB128GB
Battery Capacity3260mAh3245mAh3450mAh
OSAndroid 8.1 OreoAndroid 8.1Android 8.1
Resolution1080x2280 pixels1080x2280 pixels1080x2280 pixels
general
BrandVivoVivoOppo
ModelZ1X21iR15
Release dateApril 1, 2018May 1, 2018March 1, 2018
Form factorTouchscreenTouchscreenTouchscreen
Dimensions (mm)154.81 x 75.03 x 7.89154.37 x 74.98 x 6.99155.10 x 75.20 x 7.40
Weight (g)149.30159.00175.00
Battery capacity (mAh)326032453450
Removable batteryNo--
ColoursPorcelain Glaze Black, Hyun Screen Red, and Sapphire BlueAurora White, Polar Night, Ruby RedSnow White, Hot Red, Star Purple
display
Screen size (inches)6.266.286.28
TouchscreenYesYesYes
Resolution1080x2280 pixels1080x2280 pixels1080x2280 pixels
hardware
Processor2.2GHz octa-core2GHz octa-core2GHz octa-core
Processor makeQualcomm Snapdragon 660MediaTek Helio P60 (MT6771)MediaTek Helio P60 (MT6771)
RAM4GB4GB6GB
Internal storage16GB64GB128GB
Expandable storageYesYesYes
Expandable storage typemicroSDmicroSDmicroSD
Expandable storage up to (GB)256256256
camera
Rear camera13-megapixel12-megapixel16-megapixel
Rear flashLEDDual LEDLED
Front camera12-megapixel24-megapixel20-megapixel
software
Operating systemAndroid 8.1 OreoAndroid 8.1Android 8.1
SkinFunTouch OSFuntouch OS 4ColorOS 5.0
connectivity
Wi-FiYesYesYes
Wi-Fi standards supported802.11 b/g/n802.11 b/g/n802.11 a/b/g/n/ac
GPSYesYesYes
BluetoothYesYesYes, v 4.20
USB OTGYesYes-
Number of SIMs222
FM-Yes-
Wi-Fi Direct--Yes
sensors
Compass/ MagnetometerYes--
Proximity sensorYesYesYes
AccelerometerYesYesYes
GyroscopeYesYes-
Ambient light sensor-YesYes
sim 1
SIM Type-Nano-SIMNano-SIM
GSM/CDMA-GSMGSM
3G-YesYes
4G/ LTE-YesYes
sim 2
SIM Type-Nano-SIMNano-SIM
GSM/CDMA-GSMGSM
3G-YesYes
4G/ LTE-YesYes
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