When you’re running a Macbook Air or Pro with an SSD in it, you’re probably concerned about space on your drive. You can easily sort files in the Finder by size to see what you might want to delete or at least put on an external drive, but sometimes it’s nicer to visualize your data in a different way.
That’s where apps like GrandPerspective come in. This one is simple to use, works well, and is entirely free. It helps you see your data as an image, and then you can decide what to do with your files from there.