Firstly big ups on using an app to monitor calorie consumption! In my experince it really helps...
I found fat secret more user friendly, although dont expect accuracy from its exercise category - I skipped it completely. We all burn calories at diffrent rates and workout at very diffrent intensity so I just dont trust it
As for adjusting your intake on training and non training days :
On non training days your body is in recovery, and is working hard to repair the damage you did in the gym. In order for it to execute this function properly it needs energy, which obviously come from what you throw down the hatch. So IMO no keep your intake stable...
Remember that you want to maintain as much muscle as possible during fat loss, so aim to lose around .5kg a week... Most of my research has shown it to be an ideal number... Adjust your calories as you need to, weekly weigh ins and discipline will help you learn your individual needs, no calculation or formula is a hard and fast rule... Use them as guide lines and do what your body needs.
Im too lazy to post sources but double check the info if you want.
Good luck man!!!