Quality filters and presets: This is subjective, obviously, but the best editing apps provide more attractive filters and presets (and a wider range of them) for those who don’t want to spend a ton of time tweaking each photo.If an editing app retains both the individual edit steps and the slider positions for each adjustment, even after being closed and reopened, all the better. Powerful edit-history functionality: You should be able to make changes without permanently changing the source image, and you should be able to move forward and backward through the edit timeline if you change your mind about edits later on.
The best editing apps provide finer granularity without sacrificing usability, make it easier for you to understand the effects of edits with before-and-after comparisons, and maximize your view of the photo without hiding necessary controls.
The best go further to offer stuff like healing brushes, a histogram, curves, split toning, layers and masks, correction for chromatic aberration, and more. Powerful adjustments and great-looking output: Most photo editing apps offer the basics, such as brightness, contrast, and sharpening.