This has got to be my absolute favourite photo-editing app. They provide tons of amazing filters and frames that a professional photographer or novice would enjoy.
They also provide a square crop feature which is nice (especially for Instagram users). While also providing little sisters and decor for those who enjoy spicing up their photos a little further. Adjusting exposure, brightness, sharpness, and those type of photograph specifications are made easy with this app.
At the price of $0.99, this is one photo-editing app, you should definitely not pass up. Find it in the App Store here.