FontGoggles

FontGoggles is a macOS desktop application that lets users preview and compare fonts across a wide range of formats, including TrueType, OpenType, variable fonts, color fonts, TrueType collections, Web Open Font Format files, UFOs, designspace files, and TTX. It focuses on text behavior, providing accurate shaping through HarfBuzz and allowing OpenType features to be toggled on or off. Users can open multiple fonts at once, explore design spaces, and see changes reflected instantly when source files are edited on disk.

The interface supports vertical text layout, scaling of sample text, baseline adjustments, and a dark or light mode. Files can be dragged onto the application or opened from the dock, and a Unicode picker facilitates character selection. Project files can be saved for later reference, and the tool can launch external editors for further font editing.

FontGoggles is free, open‑source, and distributed via direct download or Homebrew cask. It is aimed at type designers, developers, and anyone needing to inspect, compare, or debug complex and variable fonts quickly and interactively.