This disappointing application promises to reveal both folder and file sizes, but its poor design and trial limitations make it less useful than standard features found in Windows Explorer. Folder Size Viewer's unappealing, multipane interface displays your folders in a tree list, but it doesn't automatically read the contents of selected folders as Windows Explorer does. We're disappointed that users must individually open each folder before the program can actually reveal its memory expenditures in the second pane. Oddly, this section only shows individual files and their sizes unless you choose the option to include nested folders. Considering this application's name and promised functionality, this doesn't make any sense. The third section is apparently designed to visually display the biggest files or subfolders in a directory, but the prominent Unregistered Version watermark covers much of the information with the demo version, and size is not included. No other features or functionality are offered. With the host of more effective programs available, including some freeware options, users shouldn't have any problem finding a better and less costly alternative to determine folder size.