Comparison
A Disk Analyzer Comparison Without the Scoreboard
People comparing disk analyzers, including readers looking at SpaceSniffer alternatives, usually need a clearer view of a drive. This page compares approaches. It does not publish speed tests, star ratings, or a winner.
Updated October 21, 2026. Windows menus can differ by version and by settings on the PC.
| Approach | What you look at | Useful when | Keep in mind |
|---|---|---|---|
| Windows Storage settings | Categories such as installed apps, temporary files, and System & reserved. | You want the supported cleanup screens and a volume summary. | It is not a map of every file path. Labels vary by Windows version. |
| File Explorer | A Size column for files, and Properties for a folder total and size on disk. | You already know which folder to open and you want Windows to count it. | Folder rows often omit a size until you open Properties. The count can take a while. |
| Treemap view | Rectangles whose area follows folder and file size. SpaceSniffer is one published example. | You want the largest areas to stand out before you read a long list. | Color and position need a legend. The picture is only as complete as the scan. |
| Folder tree or size bars | A hierarchical list, sometimes beside a treemap or a bar. | You want exact names and a sort order more than a poster of the drive. | A long tree still hides the shape of the disk until you sort or expand it. |
| NTFS index scan | A file list built from the volume’s file index rather than by opening every folder. | The volume is NTFS and you want a list without walking each directory. | Permissions, the size definition, and non-NTFS disks still matter. This page has no timings. |
| SpaceSanifferDo browser tools | A fixed sample map, a capacity calculator, and a unit converter. | You want to practice the ideas before you use a real scanner. | These tools do not read your computer and they are not a desktop product. |
Built-in Windows views
Storage settings and File Explorer ship with Windows 10 and Windows 11. They are the first SpaceSniffer alternatives for anyone who does not want another program: a category summary, a temporary-files list, and folder Properties. They will not draw a treemap. For many full-drive questions they are enough, especially when the heavy category is apps, temporary files, or a personal library you can open.
Treemap tools, including SpaceSniffer
A treemap disk view draws size as area. SpaceSniffer, published by Umberto Uderzo of Uderzo Software, is a portable freeware example. The developer describes a scan that draws folders and files as rectangles, a single click for detail, a double click to zoom, and filters you type into a filter field. Those are product facts from the developer’s site, not measurements made by SpaceSanifferDo.
Other programs use a treemap, a folder tree, or both. This comparison does not rank them. A layout you can read is more important than a label on a chart, and a fast list is still not a decision about which files to delete.
What changes between approaches
The differences that matter are the root you scanned, the size definition (logical size or allocated size), whether hard links are counted once, and whether the account could open every folder. Two tools can disagree while both are “right” about the question they actually asked. The analyzer guide covers that accounting. The visualizer guide covers how to read area once you have it.
The independent SpaceSniffer guide explains the published treemap, zoom, and filter behavior in more detail. The developer’s own description is on the SpaceSniffer product page at uderzo.it. That site is operated by the developer, not by SpaceSanifferDo. This page does not offer a download.