These days there is an App for everything and I have used quite a few apps so far. I use apps for banking, for playing games, for watching movies just to name a few. I have even created a design for an app to help new writers starting out in the industry find jobs where they can gain experience and make their mark as writers.
I have only tested one creative app and I really liked it. The app is called Sketch Master and it allows you to transform a photo into a sketch that looks more like a cartoon character. I was not allowed to use it for any of my projects because my professor advice against it. They wanted the student to use their own creative skill to which I can appreciate. I think it was a great idea and it works really well. It gives the option of doing the picture in color or black and white.