No, CHIGEE Display does not have built-in APP. It operates by mirroring your phone's content to CHIGEE Display using Bluetooth and Wi-Fi, primarily through CarPlay / Android Auto / HiCar. In theory, if your phone's APP supports CarPlay / Android Auto / HiCar, you can use that app on device.
Please note, for safety reasons and in compliance with regulations for motorcycle use of CarPlay and Android Auto, video software is not allowed for mirroring. You cannot use video apps like YouTube or Netflix on CHIGEE Display.