- Disk space analyzers by system
- Ten tools that show what's filling your drive
- Your operating system decides most of this list
- The ten, sorted by where they run
- How to read a disk space map without deleting the wrong thing
- Five questions before you pick a disk analyzer
- My advice before you start deleting
- Frequently asked questions
The best WinDirStat alternatives depend on your operating system first. Windows has several treemap and chart tools, Macs have their own map-style analyzers, and Linux users can choose desktop apps or tools that run in a terminal. Ten options follow in no particular order, with the system each one runs on.
Your drive is nearly full and you've no idea why. A disk space analyzer answers that in minutes by showing which folders and files take up the room, usually as a coloured map you can click into. WinDirStat is the classic name for it on Windows, and plenty of people go looking for something else.
WinDirStat itself isn't in this list. The ten tools below are alphabetical and in no particular order, each labelled with the system it runs on, and every description comes from the developer's own website or project page, read as of Nov 2026.
Disk space analyzers by system
| Tool | Type | Good for |
|---|---|---|
| DaisyDisk | Mac disk analyzer | A clickable map of what fills a Mac |
| Disk Inventory X | Free Mac disk usage tool | Free, open source treemaps on a Mac |
| Filelight | KDE disk usage app for Linux | Folders drawn as concentric rings |
| gdu | Terminal disk analyzer | Disk checks from the command line |
| JDiskReport | Java disk report for Windows, Mac and Linux | Charts and tables of folder sizes |
| ncdu | Terminal disk analyzer for servers | Remote servers with no graphical desktop |
| QDirStat | Linux desktop disk analyzer | Tree view, treemap and file type stats |
| SpaceSniffer | Portable Windows treemap tool | A portable treemap of folders and files |
| TreeSize | Windows disk space analyzer | Home PCs through to company storage |
| WizTree | Windows and macOS disk analyzer | Scanning NTFS drives through the Master File Table |
Ten tools that show what's filling your drive
DaisyDisk
Best for: Mac users who want an interactive map of their disk that shows the biggest space users and removes them by drag and drop.
Disk Inventory X
Best for: Mac users after a free disk usage tool released under the GPL, with a layout based on the KDirStat algorithm.
Filelight
Best for: Linux desktop users on KDE who'd like folders shown as concentric rings, with scans of local, remote or removable disks.
gdu
Best for: Command-line users who want a console disk analyzer written in Go, built with SSDs in mind but working on hard drives too.
JDiskReport
Best for: Windows, Mac and Linux users with Java installed who want overview charts and detail tables of what each folder uses.
ncdu
Best for: Admins hunting space hogs on a remote server with no graphical setup, through a text-mode interface that also works on desktops.
QDirStat
Best for: Linux, BSD and macOS users who want a tree view, treemap and details panel, from the author of the original KDirStat.
SpaceSniffer
Best for: Windows users who want portable freeware that draws folders and files as a treemap, with donations welcome.
TreeSize
Best for: Home users and IT admins on Windows who want pie, bar and treemap charts, with a Free edition beside Personal and Professional ones.
WizTree
Best for: Reading NTFS drives on Windows through the Master File Table directly, now also on macOS and free for personal use.
Your operating system decides most of this list
Here's the thing most people don't expect: there isn't one analyzer that suits everyone, because the operating system narrows the choice before features do. WizTree's page says it reads the Master File Table directly from the disk, which it gives as the reason it's quick on NTFS drives, and it says it's now available for macOS as well.
Want AI doing the heavy lifting in your marketing?
I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.
On a Mac, DaisyDisk draws an interactive map of the disk, and Disk Inventory X says it's free and released under the GPL. On Linux, Filelight (from KDE) and QDirStat are desktop tools, while gdu and ncdu run in a terminal, and the latter's page says it's designed for finding space hogs on a remote server where you don't have a full graphical setup.
The ten, sorted by where they run
- Windows. TreeSize, with a Free edition beside its Personal and Professional editions, and SpaceSniffer, a portable treemap tool. The MFT reader above also runs here.
- Mac. The two Mac programs above, one with a clickable map and one free under the GPL.
- Linux desktop. The KDE ring view and the Qt-based tree and treemap tool above.
- Terminal. The two text-mode tools above, which suit servers and anyone happy on the command line.
- Any system with Java. JDiskReport, whose page lists Windows, Mac and Linux and says it needs Java.
How to read a disk space map without deleting the wrong thing
- Big isn't the same as unwanted. Photo libraries, mail archives and virtual machines are often the largest items on a drive, and you probably want to keep them.
- Leave system folders alone. Windows, macOS and Linux all keep large system files that look tempting and break things when they go missing.
- Look for duplicates and old downloads first. The downloads folder, old installers and forgotten backups are the safest places to start.
- Uninstall rather than delete. If a game or app is the problem, remove it through its uninstaller so it doesn't leave pieces behind.
- Back up before a big clear-out. If you're removing a lot at once, copy it somewhere first.
Five questions before you pick a disk analyzer
- Which operating system, and which drive format, am I scanning?
- Do I want a desktop window or a terminal tool?
- Will I scan a remote server as well as my own machine?
- Do I need to export the results, for example for an IT report?
- Does the free edition cover how I'll use it, at home or at work?
If clearing space is the real goal, my list of CCleaner alternatives covers cleanup suites, my guide to freeing up space on Google Drive helps with cloud storage, and if you're moving to a bigger drive, my roundup of disk cloning software covers the copy.
Do you make a disk space analyzer? Tool makers can ask to be considered for a featured place on this list.
My advice before you start deleting
Pick the tool that fits your system first, then use it to look, not to clean. These tools show where your space went, and that's where their job ends. Deleting is still your decision, so start with the obvious leftovers such as old downloads and installers, leave system folders alone, and uninstall big apps through their uninstallers rather than dragging their folders to the bin. You'll often get more space back that way than by hunting down the single largest file on the map.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
What is the best WinDirStat alternative?
It depends on your system. Windows users have several chart and treemap tools to choose from, Mac users have map-style analyzers, and Linux users can pick a desktop app or a terminal tool.
Is there a WinDirStat alternative for Mac?
Yes. Several tools here run on macOS, including map-style Mac analyzers and a Windows analyzer whose page says it's now available for macOS, as of Nov 2026.
What can I use instead of WinDirStat on Linux?
Linux users can choose desktop tools that show folders as rings or treemaps, or terminal tools that run without a graphical setup, which suits servers.
Are there free WinDirStat alternatives?
Several tools here describe themselves as free, open source or free for personal use on their own pages, as of Nov 2026. Check each developer's site for the terms that apply to you.
Why are some disk analyzers quicker than others?
One Windows tool here says it reads the Master File Table directly from NTFS drives instead of walking every folder, which it gives as the reason it's quick.
Is it safe to delete what a disk analyzer shows?
Not always. These tools show what takes up space, not what's safe to remove. Leave system folders alone, uninstall apps through their uninstaller and back up anything you're unsure about.
