VSCO Cam is an app I have used for a while. It combine picture taking, editing and sharing just like what instagram does, but it does better. The best of this app is the UI design is so clean and simple. And the photo filters it provides also are really great. I could easily take very professional photo with artistic quality by using this. And fine-tuning capabilities with sliders for every effect help you get the look you want.
You can also import photos one at a time into VSCO for editing. The app lets you share images via conventional means, like Twitter, Instagram, and Facebook, but it desperately wants you to submit your images to the app’s central sharing feature, an online photo gallery called the Grid. The only way to get your own shots into the public Grid is to be selected via a mysterious vetting process, but if all you want to do is make your photos available to friends, you can share a URL for the images you add to your own personal Grid.