FontDoctor
FontDoctor is a font management and diagnostic utility from Extensis that helps users organize, validate and troubleshoot font installations on macOS. It scans font libraries for corrupted files, duplicate entries, missing font families and installation conflicts, then offers repair and cleanup tools to resolve issues. The app was particularly popular among graphic designers, typographers and publishing professionals who maintained large or complex font collections and needed reliable tools to keep their font systems running smoothly.
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1 suggestionFontDoctor has been discontinued by Extensis and is no longer supported by the developer, with no native Apple Silicon build ever released. The Intel-only app continues to run under Rosetta 2 today, but Apple will remove Rosetta in macOS 28 (September 2028), at which point FontDoctor will stop launching entirely on newer Macs. You should begin transitioning to an actively maintained font management tool now. Font Book, included free with macOS, provides basic font organization and validation for most users. For more advanced font management, professional designers often use Font File Browser or Font Manager (by Linotype), both of which offer native Apple Silicon support and active development. If you have critical font data or organizational metadata in FontDoctor, export or document it before migration becomes urgent.
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