Kid Charlemagne
I am the Very Model of a Modern Moderator
It's hands down the best DM app out there for running 5th Ed.
If I could do some of the encounter building on my PC, or if they had a desktop version, I'd be a very happy camper. I'm not a fan of doing a lot of data input on mobile devices. However, this is the app that I use - and I've gone through almost all the options out there, including building my own Excel initiative tracker.