First off, I like the concept and design of this app. All of the people complaining about a pay wall or subscription price have obviously never developed an app. You've put in a lot of hard work into this app and thinking outside of the box. Keep up the good work!
I like the idea of the categories screen, but the categories are in a mixed order. It would be nice to have the categories alphabetized, for instance, scrolling all the way to the bottom for the Weather category, opposed to the Weather category being mixed in the middle with the other categories randomly. Basically, a sorting option for the app categories would be excellent.