Free · open source · Windows
SpaceSharp turns a drive into a map you can fly into. Every file is a box sized by what it takes up, so the biggest boxes are the answer. Filter in plain words, see what is safe to clear, and send it to the Recycle Bin without leaving the map.
v2.1 · MIT · no telemetry · all downloads
Try it here
A faithful mockup of SpaceSharp with sample data. Hover the boxes, open the scenes, get a feel for it before you download anything.
What it does
SpaceSharp reads the NTFS master file table directly instead of walking folders one by one. It asks for administrator rights once, through the normal Windows prompt, and a 1 TB drive is on screen before you have found the mouse. Other file systems get a parallel folder walk.
Type what you are looking for. The map keeps its layout and dims everything else, so you see where the matches are, not just that they exist. A drawer with checkboxes and sliders writes the same filter for you.
Windows.old, caches, the Recycle Bin, old Downloads: one checkbox per row and one Recycle button.
Shading, light direction, title bars and grid are sliders with a live preview. A palette creator makes new ones from a base color or by hex.
Opens with yesterday's map. Color by change shows what grew, shrank or appeared.
Size and share, where the space is inside, donuts by type and by age, and a callout when one thing holds most of a folder.
Fourteen categories with a legend, so a drive full of game assets looks different from one full of photos.
Everything goes to the Recycle Bin, never straight to deletion, and the map updates without a rescan.
Insights
One click swaps the map for cards that say what is scanned, free and safe to clear, which types take the space, how old it all is, and what changed. Every row is a click back to the map.
Compared
The difference is what you can do once you see it.
| Feature | SpaceSharp | WizTree | WinDirStat | SpaceMonger |
|---|---|---|---|---|
| Reads the NTFS file table for fast scans | Yes, as administrator | Yes | No | No |
| Zoomable map you fly into | Yes | No | No | Yes |
| Filter in plain words | Yes | Name search | No | No |
| Says what is safe to clear | Yes | No | No | No |
| Inspect with shares, type and age breakdown | Yes | Basic | Basic | No |
| Saves scans and shows what changed | Yes | Export only | No | No |
| Dark mode | Yes | No | No | No |
| Open source | MIT | No | GPL | Abandoned |
| Price | Free | Free for home use | Free | Was paid |
As of October 2026, from each product's own documentation. Corrections welcome on GitHub.
In plain words
SpaceSharp is a free disk space analyzer for Windows. It scans a drive and draws it as a treemap: every folder is a frame, every file is a box, and the size of each box is the space it takes up. The biggest boxes are where your disk space went, which is the whole point. You zoom into a folder by double-clicking it, go back up with Backspace, and read the name and size of anything under the mouse.
On NTFS drives the scan reads the master file table directly, so a 1 TB disk is on screen in a couple of seconds rather than minutes. The filter takes plain words such as videos over 500MB older than 1 year and dims everything else, so you see where the matches are without losing the map. The Insights view turns the same scan into numbers: space by file type, when files were last changed, the largest folders and files, what changed since the last scan, and a list of places that are usually safe to clear, such as Windows.old, caches and the Recycle Bin, with one button to send them there.
If you have used WinDirStat, WizTree, TreeSize or SpaceMonger, SpaceSharp sits in the same family and was built in the spirit of SpaceMonger: a zoomable map you fly into, with a modern dark interface, fifteen palettes, a light theme, and cleanup that only ever goes to the Recycle Bin. It is open source under the MIT License, has no telemetry and no accounts, and comes as a portable exe, a Setup.exe that updates itself, an MSI, or, once the package clears review, winget install ClearanceClarence.SpaceSharp. It speaks English, Norwegian and Arabic.
Download
For 64-bit Windows 10 and 11. Windows on ARM runs them through x64 emulation.
One-click install to your profile, no admin rights, updates itself.
Download SetupOne file, no install, no admin, no updates. The simplest thing that works. Put it on a USB stick.
Download the exeA regular installer where you choose the folder and whether it is for you or everyone. Updates itself.
Download the MSI32-bit Windows: Setup, MSI or exe. Every release lists a SHA256SUMS.txt you can check a download against. The downloads are not code-signed yet, so SmartScreen may ask once: choose More info, then Run anyway. Release notes for every version are on GitHub Releases.
Questions
The README on GitHub has the long ones.
No telemetry, no accounts, no network use except the update check, which only asks GitHub for the latest release and only when you installed with the installer. The source is public, and SECURITY.md in the repository says exactly what the app reads, writes and deletes.
Reading the NTFS file table means opening the drive itself rather than its folders, and Windows only allows that for administrators. SpaceSharp asks once through the normal Windows prompt, a small elevated helper reads the table and hands the map back, and the helper exits. Say no and the normal scan runs instead.
It looks at names only: Windows.old, the Recycle Bin, Temp folders, package caches, browser and shader caches, Windows Update downloads, and Downloads not touched in a year. Show selects them on the map; Recycle sends them to the Recycle Bin after the usual confirmation; Empty empties the bin through Windows; Review selects old downloads so you decide. Hibernation and paging files get a How to, never a button.
Files go to the Recycle Bin, never straight to deletion, and the map updates to show the space as free. Protected system folders are read-only unless you run as administrator, and even then the app never touches files by itself.
The map counts file contents. Explorer's used space also includes the file system's own structures, shadow copies and space reserved by Windows. Hard-linked data such as WinSxS can be counted once here, which Explorer's folder sizes do not do.
In your profile's local app data, one file per drive plus the previous one for comparison. Settings › Scanning sets how long they are kept, deletes them all in one click, and can stop the last scan from reopening at startup.
English, Norwegian and Arabic, following Windows by default. Arabic mirrors the whole window for right-to-left reading. Translations are machine-made and read over; corrections are welcome through CONTRIBUTING.md.
Windows 10 or 11. The portable exe and the installers carry their own .NET runtime, so nothing else needs installing. The Small build on the release page is for people who already have the .NET Desktop Runtime.
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