7 best TreeSize alternatives for PC in 2026 (disk space tools, ranked)

TreeSize is a competent disk-space mapper that most Windows users try when a C: drive fills up faster than expected. It scans the folder tree, colors the biggest offenders, and integrates with the Windows shell so a right-click on a folder starts a scan. Where TreeSize alternatives come in is the ceiling of the free tier and the platform reach. TreeSize Free scans slower than the fastest competitors, the file-content filters and treemap views live behind the Personal and Professional licenses, and there is no macOS or Linux client at all.

The picks below cover the fastest MFT-based scanner, the classic open-source treemap, the paid tools that add cleanup automation, and the Mac and Linux equivalents. Each is judged on scan speed, treemap quality, cleanup features, and cross-platform support.

Quick comparison

Why people leave TreeSize

The free version scans, but not as fast as the fastest picks below. On a modern NTFS drive, WizTree reads the Master File Table directly and returns the whole tree in a few seconds. TreeSize crawls the tree file by file, which is fine on a small volume and slow on a large one. The treemap view sits in the paid Personal tier, so anyone comparing directory sizes visually has to buy in. Content-based filters like “files older than a year” or “files larger than one gigabyte with a specific extension” also live in the paid tier. And TreeSize does not run on macOS or Linux at all. Users on r/Windows10 and the Ten Forums point out that TreeSize is honest about its free tier’s scope, but the scope is narrow enough that the alternatives below serve most cases better.

The alternatives

WizTree, fastest scans on NTFS

WizTree is the pick when the goal is a scan that finishes before the coffee is poured. On NTFS volumes the tool reads the MFT directly, which turns a multi-minute crawl into a few seconds. The interface offers a treemap, a file-size list, and a filter box. Portable mode ships in the ZIP.

Where it falls short: NTFS-only for the fast path. FAT32 or exFAT scans use the slower traversal. Windows only.

Pricing: Free for home use, paid for commercial licenses.

Download: WizTree

Bottom line: For a fast full-drive scan on Windows, WizTree is the default.

WinDirStat, classic open-source treemap

WinDirStat is the tool most guides recommend for its treemap. Each file is a cushion sized by disk use and colored by file type. Slow on large drives, since it traverses the tree file by file, but the visualization is the reference.

Where it falls short: Slow scans, small maintenance team, and the UI has not been redesigned in years.

Pricing: Free.

Download: WinDirStat

Bottom line: For the classic treemap look, WinDirStat is still the shortest path.

SpaceSniffer, live animated treemap

SpaceSniffer animates the treemap as the scan progresses, so a big folder is obvious before the scan finishes. The filter box supports content queries like size, extension, and age. The tool is a single portable executable.

Where it falls short: No shell integration, no scheduled scans, and development pace has slowed.

Pricing: Free.

Download: SpaceSniffer

Bottom line: SpaceSniffer wins on visualization when the drive is large enough that the scan takes minutes.

Disk Inventory X, free Mac treemap

Disk Inventory X is the Mac port of WinDirStat’s visualization. It runs on modern macOS and continues to be the free go-to for a treemap on a Mac.

Where it falls short: Scan speed is not competitive with modern tools, and the UI shows its age.

Pricing: Free.

Download: Disk Inventory X

Bottom line: For a free treemap on macOS, Disk Inventory X still fits.

GrandPerspective, modern Mac treemap

GrandPerspective is actively maintained and does the same treemap trick with a more modern feel. It runs on current macOS releases, supports the newer file systems, and exposes filters for extension, age, and size.

Where it falls short: No cleanup automation. It shows the space, it does not free it.

Pricing: Free from the developer, small paid version on the App Store to support the project.

Download: GrandPerspective

Bottom line: For a modern free Mac treemap, GrandPerspective is the pick.

ncdu, terminal-first

ncdu is the tool sysadmins run over SSH when a server disk fills up. It scans, sorts, and lets you delete entries from the keyboard. Runs on Linux and macOS from Homebrew.

Where it falls short: No GUI, no treemap. This is a terminal tool.

Pricing: Free.

Download: ncdu

Bottom line: For a headless server or a quick terminal session on macOS, ncdu is the tool.

Filelight, KDE-native treemap

Filelight is the KDE tool that draws the used space as concentric radial segments. On a Linux desktop it is the friendliest way to see where the disk went. Ships in every major distro.

Where it falls short: KDE-focused, though it runs fine on GNOME with the KDE runtime installed.

Pricing: Free.

Download: Filelight

Bottom line: For Linux desktop users, Filelight is the friendliest visualization.

How to choose

Pick WizTree on Windows for the fastest scan when NTFS is involved. Pick WinDirStat when the treemap look is what you want, or when NTFS is not the file system. Pick SpaceSniffer when a live view of a slow scan is helpful. Pick GrandPerspective or Disk Inventory X on macOS depending on whether you want a modern build. Pick ncdu when a terminal or an SSH session is the tool. Pick Filelight when the desktop is Linux and radial is what you want. Stay on TreeSize when you already own a Professional license and the shell integration plus scheduled scans are part of your daily workflow, since the paid tier is competitive with everything above.

FAQ

Which disk analyzer is fastest?

WizTree is the community reference for speed on NTFS thanks to the direct MFT read. On other file systems the traversal-based tools are all in the same ballpark.

Is TreeSize free enough for personal use?

For a one-off scan of a home PC, yes. For repeat scans, treemap views, and scheduled cleanup, the paid tier or an alternative is a better fit.

Is there a TreeSize for Mac?

No. Grand Perspective and Disk Inventory X are the direct free swaps on macOS.

Can WinDirStat be run on a Mac?

Not directly. Disk Inventory X is the Mac port of the same idea. GrandPerspective is the modern maintained option.

Can these tools find duplicate files?

TreeSize Professional includes a duplicate scanner. WizTree and WinDirStat can sort by size, which finds candidates, but a dedicated duplicate finder like dupeGuru is the correct tool.