Acorn is described as 'Photo editor built for the rest of us. With a simple interface and tools for adding everything from text, shapes, and effects, you can make the perfect picture in seconds and minutes, not hours and days' and is a popular Image Editor in the photos & graphics category. There are more than 100 alternatives to Acorn for a variety of platforms, including Windows, Mac, Web-based, iPhone and Android apps. The best Acorn alternative is GIMP, which is both free and Open Source. Other great apps like Acorn are Krita, Adobe Photoshop, Paint.NET and Affinity Photo.