First I have to but times about the two negative reviews express.
First, it is easy to enter or change its weekly budget. Just under Settings and the upper right corner to enter the desired amount. Actually just as easy it is to add a category. If you are in the categories simple options and "Add Category" finished.
In the other negative review it is not about the app itself but only to the first favorable review. I have to say that it bothers me in any way, that this app is in English. If you have a little English knowledge, to get I think with this app well clear. Furthermore, one can add its own categories and it's in half in German;) Also under "Settings" then "Edit Favorites" ......
So I find this app easy to use when one has a little bit to busy. I find the app very simply structured and none Falls complicated. The 3 permissions are okay, what is now really very little for apps.
The memory consumption is really low. One can easily check in to his task manager.
So I can recommend this app definitely and yet she's free.
