Darkroom can tweak brightness, contrast, and color temperature—features mobile photo editors have come to expect with any app—but also includes a number of other simple tools. The infinite history makes it easy to eliminate any edits you don’t like and mimics what it is like to work in Adobe Photoshop. The app comes with 12 filters, but also gives you the option to create and save custom filters. One of the handiest features that I found in Darkroom was the ability to save horizontal and vertical photos as squares—eliminating the need to drop a photo into an app like #NoCrop in order to share non-square images to Instagram. It is certainly simple, but it is the kind of feature that could save a lot of time.