Oppo A3s vs Asus ZenFone 4 vs Asus ZenFone 4 Max comparison

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key specs
Display6.20-inch5.50-inch5.50-inch-
Processor1.8GHz octa-core-quad-core-
Front Camera8-megapixel 8-megapixel8-megapixel-
Resolution720x1520 pixels1080x1920 pixels1080x1920 pixels-
RAM2GB4GB4GB-
OSAndroid 8.1 OreoAndroid 7.0Android 7.0-
Storage16GB64GB64GB-
Rear Camera13-megapixel + 2-megapixel 12-megapixel13-megapixel-
Battery Capacity4230mAh3300mAh5000mAh-
general
Form factorTouchscreenTouchscreenTouchscreen-
Dimensions (mm)156.20 x 75.60 x 8.20155.40 x 75.20 x 7.50154.00 x 76.90 x 8.90-
Weight (g)168.00165.00181.00-
Battery capacity (mAh)423033005000-
ColoursRed, Dark PurpleMoonlight White, Mint Green, Midnight BlackBlack, Gold, Pink-
Release date-August 2017July 2017-
Removable battery-NoNo-
Alternate names--ZC554KL-
display
Screen size (inches)6.205.505.50-
TouchscreenYesYesYes-
Resolution720x1520 pixels1080x1920 pixels1080x1920 pixels-
Aspect ratio19:9---
hardware
Processor1.8GHz octa-core-quad-core-
Processor makeSnapdragon 450Qualcomm Snapdragon 630Qualcomm Snapdragon 425-
RAM2GB4GB4GB-
Internal storage16GB64GB64GB-
Expandable storageYesYesYes-
Expandable storage typemicroSDmicroSDmicroSD-
Expandable storage up to (GB)256200256-
camera
Rear camera13-megapixel (f/2.2) + 2-megapixel (f/2.4)12-megapixel13-megapixel-
Rear autofocusYes---
Rear flashLEDLEDLED-
Front camera8-megapixel (f/2.2)8-megapixel8-megapixel-
software
Operating systemAndroid 8.1 OreoAndroid 7.0Android 7.0-
SkinColorOS 5.1ZenUI 4.0ZenUI-
connectivity
Wi-FiYesYesYes-
GPSYesYesYes-
BluetoothYes, v 4.20Yes, v 5.00Yes-
Micro-USBYes---
Headphones3.5mmYes3.5mm-
Wi-Fi standards supported-802.11 a/b/g/n/ac--
NFC-YesNo-
Infrared-NoNo-
USB OTG-NoNo-
FM-YesYes-
Number of SIMs-22-
sensors
Compass/ MagnetometerYesYesNo-
Proximity sensorYesYesYes-
AccelerometerYesYesYes-
Ambient light sensor-YesYes-
Gyroscope-YesYes-
Barometer-NoNo-
Temperature sensor-NoNo-
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-