Apps similar to TreeSize include WinDirStat, which is free and open source. Other options are WizTree, Baobab Disk Usage Analyzer, SD Maid SE and Filelight. There's no shortage of Disk Usage Analyzers like TreeSize, with more than 100 alternatives for Windows, Mac, Linux, Android and the web.
Free disk analyzer for Windows scans drives to reveal largest files and folders, displays visual tree with size bars, supports file type labels and minimum-size filtering, offers search and browser-based lookup, and includes safe cleanup features to remove temporary files.
SpaceBrowser scans a folder or volume and displays its contents as a size-proportional treemap, making large files and directories easy to identify.
France
EU
disk-insight is a local-only disk usage viewer for Windows. It reads NTFS Master File Table (MFT) data directly for fast scanning and presents the result as a tree-first view, so you can expand folders and see where storage is used before deciding what to review.
Find what is filling a disk, mark what should go, and remove it — with the volume's free space in view the whole time.
Canada
StorageRadar maps your disk, shows blocked paths instead of hiding them, lets you dry-run cleanup, and compares what changed over time. Scan data stays local, while analytics and diagnostics remain separately controllable in settings.
Thailand
Scans Windows folders from File Explorer, exports hierarchical and flat Excel reports with duplicate detection, reclaimable space analysis, long path and permission audits. Color-coded, multi-sheet output stays local, requires no internet, never transmits data.
ItalyEU
FreeUpDisk is a free disk space analyzer and cleanup tool for Windows and Mac. Its core feature is a treemap visualization: a visual map where every file and folder on your drive is represented as a colored rectangle, with size proportional to how much space it occupies.
Monitor mounted volumes and manage network targets from the menu bar. Reconnect shares, use profiles, and recover offline targets.
Switzerland
Native macOS disk analyzer that scans folders and space, presenting file-type treemaps or ring charts beside a Finder-style outline. It can reveal items, send them to Trash after confirmation, flag caches and build output, and offer an optional read-only JSON CLI.
Canada
A modern disk space analyzer for Windows that visually maps your storage and uses AI to help you quickly find and clean up unnecessary files.
United States
Help you to view at a glance all the folders, files inside them and the space occupied by them on your system
China
This tool enables you to get a usage piechart from your FTP service, showing which directories are taking the most space, and to drill down into those directories to see which are the largest files. Simply double-click on a pie segment to drill down!
Brazil
