Object recognition issue - Unity vs Scanner App

Hi, I am developing an app for recognizing different objects and open a link to a website if the object is detected (no continuous tracking, no augmentation). I have scanned some objects with the vuforia object scanner app. In test mode, objects get recognized really fast and have stable tracking as well. However, in my Unity app, the objects get barely recognized at all. Often it takes really long and is working only from few angles. Tested on OnePlus 3, Samsung Galaxy S6, Samsung Galaxy S7 Scanning the object and recognizing with unity app were under exact same lighting and surrounding conditions. Autofocus is working in my unity app. Please give me any hints on how I can match the recognition performance of the scanner app. Thanks in advance