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36MB to download the full app. It takes up 66MB on my disk. Photoshop CC takes up 1.1GB, that’s 20 times as much – quite a contrast.

I wonder what takes up that much space in Photoshop. I suspect the brush files, iirc those take up quite some space. I can imagine Pixelmator uses much more native / vertex images, like those you can create using PaintCode [1], which generates a bit of native Objective C code to produce the image you draw in that app. Paintcode is a great way to reduce the size of your app's downloaded content, btw.

[1] http://www.paintcodeapp.com/

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