A fast, native WinUI 3 disk-usage analyzer for Windows — scan drives, browse folder trees, and explore an interactive extension-colored treemap.
The quickest way to find out what's eating your disk:
- Grab
WinDirectoryStats-vX.Y.Z-win-x64.zipfrom the latest release - Right-click → Extract All…
- Double-click
WinDirectoryStats.exe— that's it. Portable, no installer, no admin rights, and no .NET download required (the runtime is bundled).
First launch? Windows SmartScreen may show "Windows protected your PC" because the app isn't code-signed — click More info → Run anyway.
- 🔍 Non-blocking scans — scan any local drive or folder without freezing the UI, with live progress and a cancel button.
- 🌲 Configurable traversal depth — limit how deep the scan goes before it starts (1–128 levels, default 6); the status reports how many deeper folders were skipped.
- 📁 Lazy folder tree — browse a lazily populated directory tree with sizes, percentages, and item totals; rescan or step up with one click.
- 🏷️ Largest-files view — inspect and filter the biggest files in the selected directory.
- 🎨 Extension statistics — totals, file counts, and percentages per extension, with stable colors per extension.
- 🗺️ Interactive treemap — an extension-colored treemap (custom-built panel) showing at a glance where the space goes; open files, reveal them in Explorer, copy paths, or send them to the Recycle Bin after confirmation.
- 🛡️ Robust traversal — skips reparse points, continues past inaccessible paths, and collects errors for review.
- ⚡ Single instance — launching a second instance restores the first; a folder can also be passed as a command-line argument.
WinDirectoryStats/
├── App.xaml(.cs) # Entry point, single-instance mutex, crash logging
├── MainWindow.xaml(.cs) # Drive picker, scan controls, results tabs, treemap + details layout
├── Controls/
│ └── TreemapPanel.cs # Custom layout panel that draws the interactive extension-colored treemap
├── Services/
│ └── DiskScanner.cs # Cancellable, depth-limited, reparse-point-aware filesystem walker
├── Models/ # DiskItem, DriveOption, ExtensionStat
└── Helpers/ # Extension color palette, human-readable size formatting
Scans run off the UI thread via IProgress<T> reporting; the treemap is a custom Panel subclass laid out with a squarified arrangement, so it scales with the window and stays interactive (click to select, double-click to act).
| Layer | Technology |
|---|---|
| UI framework | WinUI 3 (Windows App SDK 2.4), native Fluent styling |
| Runtime | .NET 8 (net8.0-windows10.0.19041.0) |
| Filesystem scanning | Hand-written cancellable walker (no recursive APIs) |
| Treemap | Custom WinUI 3 Panel — no third-party dependencies |
WinDirectoryStats is an independent project inspired by the interaction model of WinDirStat. It is not affiliated with the WinDirStat team and does not copy the upstream MFC/C++ implementation or branding assets.
- Windows 10 version 1809 (build 17763) or later — Windows 11 recommended
- .NET 8 SDK (for building from source)
- Visual Studio 2022 with the WinUI application development workload (optional, for the IDE experience)
Unpackaged app: WinDirectoryStats runs as a plain
.exe— no MSIX package, no developer mode, no signing certificate required. The Windows App SDK runtime is bundled with the build.
# Restore + build (x64)
dotnet build WinDirectoryStats.csproj -p:Platform=x64
# Run
dotnet run --project WinDirectoryStats.csproj -p:Platform=x64
# Other platforms
dotnet build WinDirectoryStats.csproj -p:Platform=x86
dotnet build WinDirectoryStats.csproj -p:Platform=ARM64
# Self-contained publish (x64)
dotnet publish WinDirectoryStats.csproj -c Release -p:Platform=x64Or open WinDirectoryStats.sln in Visual Studio 2022, pick x64, and press F5.
| Action | How |
|---|---|
| Start a scan | Pick a drive (or browse for a folder) → Scan |
| Scan a specific folder | Pass it as a command-line argument, or use the folder browse button |
| Adjust scan depth | − / + next to the depth counter (1–128 levels) |
| Cancel an active scan | Cancel button |
| Rescan the current location | Rescan button |
| Go up one level | Up button |
| Review scan warnings | Errors button (skipped/inaccessible paths) |
| Act on a file | Right-click in the treemap or lists → open, reveal in Explorer, copy path, or recycle |
- Live treemap updates while scanning — watch the map build in real time
- Duplicate file finder — content-hash based duplicate detection
- Scan history & comparison — snapshot a drive and diff it over time
- Jump-to-folder from treemap zoom — navigate the map like the classic WinDirStat
- Export reports — CSV/JSON export of scan results
- Dark/light theme toggle — follow or override the system theme
- Localization — the UI is currently English-only
Want something on this list sooner? Open an issue (or a PR 😉) and say so — the roadmap is flexible.
Contributions are very welcome — code, bug reports, documentation, and feature ideas all count. It's a small, focused codebase (one window, one scanner, one custom control), so it's easy to find your way around.
- 🐛 Found a bug? Open an issue with your Windows version and steps to reproduce (crash details land in
%LOCALAPPDATA%\WinDirectoryStats\crash.log). - 💡 Have an idea? Open a feature request or lobby for a roadmap item.
- 🔧 Want to hack on it? Fork → branch (
git checkout -b feature/my-feature) → build with the command above → keep the existing style (nullable enabled, small focused classes) → open a PR describing what changed and why.
By contributing, you agree that your contributions will be licensed under the MIT License.
WinDirectoryStats is fully local. It has no telemetry, no analytics, and no network access — it only reads the filesystem locations you ask it to scan. Crash details (if any) are written locally to %LOCALAPPDATA%\WinDirectoryStats\crash.log and never leave your machine.
Released under the MIT License.