WhatSize是个可以让您测量 Mac 上任何文件夹、磁盘的大小的简单的OS X工具。您是否曾经想过60 GB、80 GB的硬盘空间全都跑到哪里去了？使用WhatSize，您便可获得硬盘的使用空间概况(包含隐藏的文件夹)。当然您也可使用Finder的Cmd-I， 但WhatSize给您更完整的资料。

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WhatSize 以字节为单位对文件进行快速测量,能细分到文件夹内的各个文件,甚至是Mac OS X中的角角落落,包括被隐藏的文件,缓存文件等.WhatSize将它们按大到小的顺序进行排列,用户检索时一目了然.当然,这前提是你必须认识这些文件 并且确定它们被删除 后不会影响OS X的正常运行。 WhatSize allows you to quickly measure the size in bytes of a given folder and all subfolders and files within it. You would be surprised at how many useless files might be laying around on your hard disks. The files and folders are automatically sorted by size, with the biggest sizes first. WhatSize helps find out what files are taking up all of that space. Then it makes it really easy to remove or move those files. You'd be surprised how many useless files are lying around on your Mac's hard disk. While the app is measuring a folder the user can browse the files within that folder and immediately see the size in bytes. Hidden files, cache files, directories will all show up with their corresponding size. This application is similar to the ancient NeXTSTEP, DarkForest. Once the measuring of a folder has ended the user can also view the information by filtering for particular file sizes or types. The user can also move unwanted files and folder in the corresponding Trash bin similar to the Finder's Delete button.