Best Yoga App for iOS

What's the best yoga app to use for doing yoga at home?

I've seen a lot of people on reddit recommend Down Dog

I've also see a new app called MeeZee Workouts which organizes YouTube videos, including several 30 day challenges, what day you're on with them, etc. MeeZee Workouts

What do you use?

There are a lot of apps online. I would still recommend a certified teacher for a beginner.