SpaceSniffer is a freeware computer disk space analyser from Uderzo Software for Microsoft Windows platforms. It uses a treemap to visualise disk usage.

A typical treemap produced by SpaceSniffer
Developer(s)Uderzo Software
Initial releaseApril 18, 2009 (2009-04-18)
Stable release / October 2, 2016 (2016-10-02)
Operating systemMicrosoft Windows
Size1.6 MiB
Available inEnglish
TypeDisc space analyser


Developed by Uderzo Software (run by Umberto Uderzo) in Italy, SpaceSniffer was first released in 2009.[1]


SpaceSniffer comes in a single edition that runs on the Windows operating platform (from Windows 2000).[2] The executable file can be simply copied without requiring any other installation process.[3]

It is free for all uses, but donations are suggested.[2] No source code is available.

Notable features include:

  • A treemap represents how disk capacity is allocated.[4]
  • Filters (based on file name, age, size, etc.) enable the user to focus the visualisation on files and folders of interest.[4]
  • User-chosen colours can be associated to different file types.[5]
  • NTFS Alternate Data Streams are supported.[5]


The application has been reviewed favourably by editors and users.[3][5] PCWorld concluded its review by pronouncing it a “recommended download”[2] and called it “a very well made program that is simple, intuitive, elegant, and very useful”.[4]

Reviewers and users have noted that the treemap presentation “can be a bit overwhelming at times” or “cluttered and more complex than necessary” but concluded that it was “effective”.[3]

Similar programs



  1. Lee Matthews (2009-04-23). "Space Sniffer is a drive space analyzer with a dash of eye candy". Download Squad. Retrieved 2011-09-16.
  2. Ian Harac (2011-01-31). "SpaceSniffer (editorial review)". PCWorld. Retrieved 2011-09-16.
  3. "SpaceSniffer (CNET editors' review)". CNET/ 2010-01-04. Retrieved 2011-09-16.
  4. "SpaceSniffer: explore a "treemap" representation of your file and folder sizes". 2009-04-24. Retrieved 2011-09-16.
  5. "SpaceSniffer — analyze disk space usage". SnapFiles. 2011. Retrieved 2011-09-16.
  6. Bernhard. "Background and history". WinDirStat website. Retrieved 1 Apr 2015.
  7. "KDirStat". Retrieved 1 Apr 2015.
  8. "Disk Inventory X". Retrieved 1 Apr 2015. The layout algorithm is based on KDirStat. The idea to develop this program came to me when a fellow of mine showed me his creation WinDirStat.

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