WhatSize is described as 'simple tool that allows the user to quickly measure the size in bytes of a given folder and all subfolders and files within it' and is an app in the OS & Utilities category. There are more than 50 alternatives to WhatSize for a variety of platforms, including Windows, Mac, Linux, BSD and Android. The best alternative is WinDirStat, which is both free and Open Source. Other great apps like WhatSize are WizTree (Free Personal), TreeSize (Paid), Baobab Disk Usage Analyzer (Free, Open Source) and DiskUsage (Free, Open Source).
- Baobab Disk Usage Analyzer is a graphical application to analyse disk usage in any Gnome environment. View 70 alternatives to Baobab Disk Usage Analyzer
- Free • Open Source
- GrandPerspective is a small utility application for Mac that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space. View 65 alternatives to GrandPerspective
- Free Personal • Open Source
- This tool uses a sunburst chart to display the usage of your hard disk or other media. The chart shows all major files and folders from all directory levels at once. View 63 alternatives to Scanner
The program seems to be no longer updated. Last version, 2.13, released in July 2012, is fully working and can be still downloaded from the official website.