Skyro

I've known Soham Mondal, the developer, for several years now and have seen literally every iteration. The amount of attention he's paid to every detail of the app is amazing, and there's a reason the pro version of the app was featured on Google Play as well. He's also done a great job of using Play Store's Alpha/Beta community.

The image and timeline features really make this app worthwhile, but the beautiful ui is a nice plus :).

+1 for use on a tablet...usually apps just upscale images + it looks horrible, these guys actually cared it seems.. nice one