This is actually what I did, but with web application and services. I tried app development in the one of my first few projects but finally gave up for web apps because it allows faster trial and error ( mainly I can push changes in UI and UX faster to a wider audience ). My take away is that stay away from "hot" topics ( news, game app ) unless you have a solid background because you need a really polish product to compete.
What metrics do you use for web applications and services? I mean with mobile app, you have downloads and ratings. But for web apps, you have no such thing.
