Alternatives to SpaceSniffer
Shows disk usage as a treemap you click into, so the biggest folders and files are immediately obvious. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
SpaceSniffer
Shows disk usage as a treemap you click into, so the biggest folders and files are immediately obvious.
Replacements
Listings that take over the same core job as SpaceSniffer.
WinDirStat
Draws your whole drive as a treemap, so a single 40 GB file is a huge rectangle you cannot miss.
WinDirStat is open source under GPL-2.0 and adds duplicate finding by hash and saved scans, with installers for x64, ARM64 and x86.
WizTree
Finds what is eating a Windows disk in seconds by reading the NTFS master file table directly.
WizTree reads the NTFS master file table for scans in seconds and pairs a treemap with a sorted list, but commercial use needs a paid licence.
TreeSize Free
Shows which folders are eating a Windows drive, ranked largest first, without a scan that takes all afternoon.
TreeSize Free shows a size-sorted folder tree instead of a treemap, is free for commercial use and integrates with the Explorer right-click menu.
Filelight
Shows disk usage as concentric rings you can click into.
Filelight is open source and runs on Windows and Linux, using a concentric ring chart instead of a treemap, and pulls in KDE libraries.
gdu
Find large directories with a terminal disk-usage analyzer.
gdu is an open source terminal analyzer for Windows, macOS and Linux, trading the visual treemap for a text interface with parallel scans.
Dust
See which directories consume space in a compact terminal tree.
Dust is an Apache-2.0 command-line tool that prints a compact tree with size bars, running on Windows, macOS and Linux.
dua-cli
Explore disk usage and remove unwanted files in the terminal.
dua-cli moves disk usage browsing to the terminal with optional deletion and is open source across Windows, macOS and Linux.
Also worth comparing
These listings name SpaceSniffer as their own alternative, so the relationship runs both ways.
DiskSavvy
A Windows disk space analyzer that classifies files on local disks, network shares and NAS devices.
SpaceSniffer is free, portable Windows freeware with a live-updating treemap, but it lacks DiskSavvy's file classification reports and command-line utility.
FolderSizes
A Windows disk space analyzer that reports folder sizes and finds large, old and duplicate files.
SpaceSniffer is free portable Windows freeware showing a live treemap, without FolderSizes' scheduled reports, trend snapshots or export formats.
Similar software
Related functionality, not a direct replacement.
DaisyDisk
Interactive sunburst map of disk usage for macOS.
GrandPerspective
Treemap view of disk usage on macOS.
ncdu
A disk usage analyser with a text interface, built for finding what is filling a remote server you can only reach over SSH.
duf
Shows disk usage and free space in a readable coloured table.
Wise Disk Cleaner
A free Windows tool that removes junk files, wipes browser traces and defragments disks.
Microsoft PC Manager
Microsoft's free Windows app for cleaning up storage, managing pop-ups and running quick system checkups.
