StuffIt Archive Manager

StuffIt Archive Manager is a file compression and decompression utility for macOS that handles a wide range of archive formats including StuffIt's native .sit and .sitx formats, as well as ZIP, RAR, 7-Zip and other compressed file types. It was widely used in the 1990s and 2000s for sharing files over slow internet connections and remains relevant for users who need to work with legacy StuffIt archives or unusual compression formats. The app provides drag-and-drop extraction, batch processing, and context menu integration.</description> <parameter name="recommendation">StuffIt Archive Manager has not received meaningful updates in many years — the last mention of active development dates back to the early-to-mid 2010s, and there is no evidence of a native Apple Silicon build. The archive utility landscape has shifted dramatically: modern macOS now includes built-in ZIP support (which handles most everyday compression needs), and free, actively maintained alternatives like The Unarchiver and Keka run natively on Apple Silicon and support far more formats than most users will ever encounter. Since you are running a Mac from 2026, you almost certainly have native alternative options already available. StuffIt will continue to work under Rosetta 2 until September 2028, when Apple removes it and the app will stop launching entirely. If you still have StuffIt archives to process, The Unarchiver is the recommended replacement — it is free, lightweight, open-source, actively maintained, and handles legacy StuffIt formats alongside every modern archive type. For most users, macOS's built-in archive tools are sufficient on their own.