Erwin Bonsma

1 Mac app on Kitsmith

GrandPerspective’s own site tells its origin in his own words: "it started purely as a fun coding exercise when I got my first Mac Mini." The site is copyright-signed "Erwin Bonsma" and links to his personal site, which shows a wider creative streak — optical-illusion art and puzzle games — alongside 20+ years of maintaining this one utility.

website

GrandPerspective

Free (or $2.99 via Mac App Store — same app)

A free, open-source disk-usage visualizer using tree maps — 20+ years running from a single developer — also on the Mac App Store for $2.99.

Utilities Screen Open source Homebrew Verified August 30, 2026

260 apps, every one checked by hand against the developer's own site or the Mac App Store — prices, requirements, and claims verified at the source.

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