A native macOS disk-usage analyzer that displays file and folder sizes in a treemap.
FreeOpen source
SpaceSniffer
A portable Windows disk-usage analyzer with a nested treemap, filters and text-report features.
About SpaceSniffer
SpaceSniffer is a portable Windows disk-usage analyzer. After a scan, it shows folders and files as a nested treemap, where larger rectangles represent larger items, so users can see where most of the space on a drive is used. Clicking an element shows its contents, and double-clicking zooms it to fill the view.
The tool supports filtering by file type, file size, and file date, and these filters can be combined. Files can be marked with four tag colors to track which items have been reviewed. Results can be exported as a text report, and the report layout can be customized. The homepage describes SpaceSniffer as freeware and says donations are welcome.
Key features
- Treemap view that sizes folders and files by their disk usage
- Click to inspect an element's contents; double-click to zoom in
- Filter field for file types, such as *.jpg, with exclusion using a leading pipe
- Filters by file size and file age, such as >1mb or >2years
- Four tag colors for marking examined files, with tag-based filtering
- Embedded export module for textual reports with customizable layout
Best for: Windows users who need to find which folders and files are using the most space on a disk and want a portable tool that does not need installation.
Good for
- Free to use, according to the homepage
- Portable application, as described on the homepage
- Treemap layout gives a visual overview of where large items are stored
SpaceSniffer at a glance
- Category
- Software & Utilities › System Utilities
- Type
- Online tool
- Pricing
- Free
- Open source
- Not stated
- Last checked
- Oct 9, 2026 · Online when checked
- Listed
- Oct 9, 2026
SpaceSniffer alternatives
Tools and sites you could use instead, ranked by how closely they match.
GNOME’s Disk Usage Analyzer, also called Baobab, shows folder usage in a tree and graphical views.
FreeOpen source
Popular in System Utilities
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SpaceSniffer FAQ
How can I exclude certain file types from the view?
Type a starting pipe before the file type in the filter field, for example |*.jpg, and press enter. The view then shows everything except JPEG files.
How can I find old files?
Type a condition such as >2years in the filter field. The view updates to show files that match the age condition.
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