Polarr is described as 'From high-precision light and color tools, to advanced clarity and dehaze settings, to the ability to create and save your own filters. Polarr is the ideal photo editor for bloggers, students, and photo professionals alike' and is a well-known app in the Photos & Graphics category. There are more than 100 alternatives to Polarr for a variety of platforms, including Windows, Mac, Online / Web-based, iPhone and iPad. The best alternative is GIMP, which is both free and Open Source. Other great apps like Polarr are Adobe Photoshop (Paid), Affinity Photo (Paid), Photopea (Free) and darktable (Free, Open Source).
darktable is a virtual lighttable and darkroom for photographers: it manages your digital negatives in a database and lets you view them through a zoomable lighttable. it also enables you to develop raw images and enhance them.
Pixlr® makes it easy to transform everyday images into stunning works of art. Whether you’re applying a quick fix to your photos or adding your personal touch with effects, overlays, or borders, Pixlr has everything you need to make your moments beautiful.