Apps similar to SquirrelDisk include WinDirStat, which is free and open source. Other options are Double Commander, WizTree, Baobab Disk Usage Analyzer and SD Maid SE. You're spoiled for choice with Disk Usage Analyzers like SquirrelDisk: we list more than 100 alternatives for Windows, Mac, Linux, Android and the web.
Klarity is a disk space analyzer for macOS that shows where your storage went as a treemap: every file and folder is a rectangle sized to scale, so the biggest items are visible at a glance instead of being found one folder at a time.
India
Canada
Monitor mounted volumes and manage network targets from the menu bar. Reconnect shares, use profiles, and recover offline targets.
Switzerland
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
Help you to view at a glance all the folders, files inside them and the space occupied by them on your system
China
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
DiskNebula turns your storage into a living treemap, then uses private on-device AI to explain what is taking up space, what is likely safe to remove, and where to start cleaning up.
Japan
LighterMac opens up the “System Data” your Mac won't explain and tells you, item by item, what each thing is and what happens if you delete it (“Xcode rebuilds it on the next build”, “this may be your only copy”).
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
A native Windows application for quickly analyzing disk usage and finding the files and folders that consume the most space.
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
MacDirStat is a free, open-source disk space analyzer for macOS, inspired by WinDirStat. It scans a drive or folder and draws every file as a color-coded rectangle sized by its disk usage, so the biggest files and folders stand out at a glance.
United States
