And those who have devices with Portrait Mode, there are tools for adjusting depth as well. But the real magic with Darkroom is the curves and color adjustment, which is intuitive and easy enough for anyone to use and understand. You'll have access to the basic photo editing tools like brightness, contrast, vignette, highlights, shadows, and much more, including filter presets. Darkroom also sees every image format, including RAW, so no worries there. It lets you view your photos, and immediately jump into editing mode when you are ready. With Darkroom, you can access your entire Photo Library from the get-go.
It's one of the best little photo editors around, and it's free. My personal favorite among these apps is Darkroom.