Unfold

Jacob looked at macOS Quick Look—your built-in file preview feature that 99 percent of Mac users ignore—and said "what if it actually worked for everything?" And honestly, that's the kind of obvious idea that makes you slap your forehead.

Unfold extends Quick Look to preview folders, archives, source code, Markdown, Mermaid diagrams, and ebooks right in Finder. No opening apps, no waiting. ZIP, RAR, TAR files instantly. Source code with syntax highlighting and line numbers so you can actually read that messy repo before cloning. Markdown renders with a table of contents. Mermaid diagrams actually render as diagrams instead of garbage text. It supports 240 file extensions and works in Spotlight, Finder, and third-party file managers.

For $10 lifetime—yes, ten dollars—you get it on three devices. That's less than a fancy coffee. If you're a developer, designer, or anyone who lives in Finder, this is one of those tiny utilities that makes your Mac feel like it finally arrived in 2024. macOS 14 Sonoma or later required.