The iPhone App VSCOcam has been around for a while, but I guess I'm a little slow at learning about it. It's not for everyone though. There is no community centered around the app so you can't collect "likes" or "followers" - but I kind of "like" that. There's no pressure to like anything. Instead you can focus on taking your own pictures and putting all your energy into building an interesting mobile photography collection.
The app has a built in camera that let's you control the focal point and the exposure point any where on your image independently. And it also contains a large selection of filters that you can purchase within the app.