SpaceSniffer vs TreeSize (2026): which should you pick?

Pick SpaceSniffer if

• Fits if you want to see at a glance which folders are using your disk
• Works for people who prefer a portable program with typed filters

Look elsewhere if

• Skip it if you use a Mac or Linux, as no other platform is named
• Too light for you if you want it to clean up junk, since it only reports
• Watch out: the site lists no system requirements
• Watch out: downloads are linked through a mirror called dAppCDN, not hosted on the vendor's own page

Pick TreeSize if

• Fits if you need to find what fills a Windows drive
• Works for IT staff who want scheduled storage reports

Look elsewhere if

• Skip it if you use Mac or Linux, as it is Windows only
• Not for you if you want free at work, as the free edition is for private use only
• Tight if you need duplicate search, since that needs Personal at 20.40 EUR a year
• Watch out: prices are in euros and may differ by region

SpaceSniffer

• It analyzes and reports; the vendor's pages describe no cleanup or deletion tools beyond the Windows file menu.
• The vendor's pages are short and the site lists no system requirements; the Windows context menu support points to Windows only.
• Downloads are linked through a mirror called dAppCDN rather than hosted on the vendor's own page.

TreeSize

• Windows only; the editions page lists Windows desktop editions.
• Prices are shown in euros on the site and may differ by region; the free edition is limited to private use.
• Duplicate search and usage comparison need a paid edition.

SpaceSniffer

Treemap view

Folders and files appear as blocks sized by how much space they use. One click opens a block for detail and a double click zooms to it.

Filter field

Type criteria such as *.jpg, >2years or a color tag to limit the view; a leading pipe excludes matches. Filters can be combined.

Color tags

Mark files red, yellow, green or blue with keyboard shortcuts to keep track of what was examined, and filter by tag.

Live scanning

You can navigate while the scan runs, and the view updates if the file system changes during a scan.

Export module

Produces text reports of the result, and the layout of the report can be customized.

TreeSize

Usage charts

Shows disk use as treemap, pie and bar charts, with a folder breakdown in an Explorer-style view.

Large and duplicate files

Personal and above filter the largest files and search for duplicates.

Many scan targets

Scans local drives, mapped network shares, and cloud or remote targets such as S3, Azure and SharePoint.

Reports and exports

Exports results to PDF, Excel, HTML or CSV, and can send scheduled reports by email.

On-premise only

The vendor says all editions run on-premise and no data leaves the PC.

Portable use

Select editions can run from a USB drive without installation.

SpaceSniffer

• SpaceSniffer$0

  Freeware for personal and commercial use; donations are optional.

TreeSize

• TreeSize Free0 EUR

  Home use only (non-commercial). Treemap chart and PDF reports of disk usage.

• TreeSize Personal20.40 EUR

  per user / year, billed annually

  Adds top-largest-file filter, duplicate search and usage comparison. 14-day trial; a perpetual option exists.

• TreeSize ProfessionalFrom 41.00 EUR

  per user / year, billed annually

  Adds command-line and task scheduler options and custom PDF, Excel and HTML exports. 14-day trial.

• TreeSize Consultant240.00 EUR

  per user / year, billed annually

  Portable licence usable across multiple client systems. 14-day trial.