Acorn is a raster graphic editor for macOS developed by August Mueller of Flying Meat Inc, based out of Mukilteo, Washington, United States. Acorn was first released on September 10, 2007 and was built upon the framework of a previous image editing application of Flying Meat Inc., FlySketch.
Acorn makes extensive use of Apple's Core Image framework for its image processing. The native file format of Acorn is .acorn. Acorn combines vector drawing with bitmap editing, and has been described as an alternative to Photoshop. Key features of Acorn include image filters, a custom color picker, a brush designer, and image editing tools such as crop, erase, paint, select, pan, zoom, move, clone, smudge, dodge, and burn.
Major Features Layers-based editing Layer masks and blending modes Multi-layer screenshots Nondestructive stackable filters Curves and levels Multi-stop live gradients Scriptable Automator support Built in brush designer to create custom brushes Photoshop brush import Vector shapes, Bézier pen tool, and text tools Shape processor Circle text tool RAW image import Multiple selection tools including quick mask and magic wand Smart layer export Web export Guides, grids, rulers, and snapping Native support for Apple's retina displays Color profile management Deep color image support Documentation online and in ePub format Runs on Metal 2
Version history Version Initial Release DateOS Compatibility Notable Features 1.0 - 1.5.5 September 10, 200710.4 - 10.10 Initial release; brush designer, fancy crop, open and save JPEG 2000 images 2.0 - 2.6.5 September 13, 2009 10.6 - 10.10 Layered screenshots, rulers, RAW image support, 64-bit support, touchup tools, JSTalk scripting support, AppleScript support, layer groups, guides and snapping, layer masks, WebP 3.0 - 3.5.2 April 12, 2011 10.6 - 10.10 Layer styles, quick mask, instant alpha, live multi-stop gradients, new filters, add/subtract points on Bézier curves, full screen support, autosave and versions, retina canvas support, smart layer export, web export scaling, new blending modes 4.0 - 4.5.7 May 2, 2013 10.8 - 10.12 Nondestructive stackable filters, curves adjustment, vector line join style, multi-layer selection, save selection with file, CMYK support when saving as JPEG and TIFF, editable image depth, sharing support, soft eraser, live font updates, live blending updates, share extension for Photos 5.0 - 5.6 August 20, 2015 10.10+ Shape processor, nondestructive curves and levels, improved PDF import, Photoshop brush import, image metadata editing, basic SVG support, deep color image support, circle text tool, new color picker, improved color management 6.0 - 6.3.3 July 10, 2017 10.11+ Text on a path, clone tool works across layers and images, new Web Export features, smart layer export settings palette, new Bézier tools, color profiles, make shape from selection 7.0 March 17, 202110.14+ Support for Mac computers with Apple silicon, tabbed document interface, new Export window, animated GIF export, perspective fix and crop tool, new color picker, Spotlight-like command bar 8.0 December 16, 202414+
Reviews and awards
Houston Chronicle Acorn 4 review The 25 Best Alternatives to Photoshop Macworld Editor's Choice Award 2009 Mac App Store Best Apps of 2013 Mac App Store Best Apps of 2015 50 Mac Essentials #46 Acorn 5: Tom's Mac Software Pick Clash of the Image Editors: Acorn vs Pixelmator Acorn 4 Macworld Review Acorn 4 The Verge Review 16 Essential Photo Editor Apps
See also Comparison of raster graphics editors Image editing
References
External links Official Webpage