OmniDiskSweeper is a

freeware Freeware is software, most often proprietary, that is distributed at no monetary cost to the end user. There is no agreed-upon set of rights, license, or EULA that defines ''freeware'' unambiguously; every publisher defines its own rules for the f ...

disk space analyzer A disk utility is a utility program that allows a user to perform various functions on a computer disk, such as disk partitioning and logical volume management, as well as multiple smaller tasks such as changing drive letters and other mount poi ...

utility for

macOS macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and lapt ...

developed by

The Omni Group The Omni Group is an American software company that develops software for the macOS, iOS, and watchOS platforms. The Omni Group was informally founded as a NEXTSTEP consulting company in 1989 by Wil Shipley, who immediately brought on Ken Case ...

, which

recursively Recursion (adjective: ''recursive'') occurs when a thing is defined in terms of itself or of its type. Recursion is used in a variety of disciplines ranging from linguistics to logic. The most common application of recursion is in mathematics ...

searches a filesystem and displays entries sorted and color-coded by size, from largest to smallest. Alternatives include DaisyDisk and GrandPerspective. Its interface presents a column view similar to the macOS Finder. OmniDiskSweeper supports internal and external drives, and network volumes. It warns users when selecting files that are required by

or by installed applications, though this only works for applications installed with macOS's Installer utility, based on BOM files. The program was first released in April 2001 as

shareware Shareware is a type of proprietary software that is initially shared by the owner for trial use at little or no cost. Often the software has limited functionality or incomplete documentation until the user sends payment to the software developer ...

. Early versions required payment to delete files, though users could also delete them manually through the Finder. The Omni Group relicensed it as freeware in 2009, stating a need to refocus on their other programs. Specialist outlets ''MacGeneration'' and ''Macworld'' describe it as a basic tool, useful to find large but unused files. ''The Register'' gave it a rating of 70/100, and included it in their 2010 selection of free essential Mac apps.

References

D MacOS-only proprietary software Disk usage analysis software {{mac-software-stub