Anyway, this is a good program (for the price, which is absolutely free). The tracking is decent (using Stump-based 20×20 gentle adaboost frontal face detector by Rainer Lienhart) , models are in good quality, and this app might receive some more updates (?) in the future too.
*This ONLY work on ARCore compatible phones!*
(Go check if your phone is compatible or not on the official google ARCore website first before downloading this app)
Ps. It's possible for this app to be able to input custom model if you play around with the source file a bit, or there might be some options in future updates