App for Directory Theme and the others?

Has anyone already built an app for Directorypress or any other theme yet??

I have a long established directory and the traffic is more mobile and tablet by a long way now!
Desktop viewings are so low I am going to have to modify my site to be even more mobile friendly.
However, an app would be great!

Another major issue with not having an app is the very limited space on the mobile version for ads.
I have used sidebars on both sides for a long time to promote listing events and don’t know what we can do to get more usable ad space?

Any advice or development would be much appreciated. Thank you John Warden