High Quality Content by WIKIPEDIA articles! Compact Pro is a software data compression utility for archiving and compressing files on the Apple Macintosh platform. It was a major competitor to StuffIt in the early 1990s, producing smaller archives in less time, as well as being distributed via shareware which greatly helped its popularity. StuffIt 3.0 "fought back" with an even more powerful compression algorithm, a shareware version called StuffIt Lite with most of the same features, including self-extracting archive creation, and the freeware StuffIt Expander which could decompress StuffIt archives and CompactPro archives. Compact Pro maintained a niche among loyal users and as a preparation tool for Cyclos`s "Smaller Installer" delivery package (which was notably used by Ambrosia Software), but disappeared from the market by the late 1990s. It is no longer supported.