Open Source C++ Disk Space Analyzers

WinDirStat (Windows Directory Statistics) is a disk usage statistics viewer and cleanup tool for Windows. On start up, WinDirStat reads the whole directory tree once and then presents it in three useful views. The official download location and collaboration platform for WinDirStat has moved to GitHub: https://github.com/windirstat/windirstat Downloads and source code provided on SourceForge may not always be up to date. They are primarily used for disaster recovery purposes.

Qt-based directory statistics: KDirStat without any KDE -- from the author of the original KDirStat. QDirStat is a graphical application to shows where your disk space has gone and to help you to clean it up. This is a Qt-only port of the old Qt3/KDE3-based KDirStat, now based on the latest Qt 5. It does not need any KDE libs or infrastructure. It runs on every X11-based desktop on Linux, BSD and other Unix-like systems and of course in a Docker container.

Bytopsy is a free, open-source disk space analyzer and PC optimization tool for Windows, designed to help users understand, manage, and reclaim storage space safely. Built with native C++20, it combines interactive disk usage visualization, intelligent junk file cleanup, duplicate file detection, application and startup management, driver updates, and disk health monitoring in one lightweight, portable solution. With support for developer environments, AI model caches, WSL, Docker, and gaming platforms, Bytopsy goes beyond traditional disk cleaners. It offers both a modern graphical interface and a powerful command-line tool, prioritizing user control, transparency, and data safety. No ads, no telemetry, no unnecessary dependencies — just powerful Windows storage management, completely free.

A simple version Disk Space Analyzer, functionality like WinDirStat (Windows Directory Statistics), SpaceSniffer, visualize file size as blocks. This program write with Win32 API, targeting light, fast, simple, include net mapped drive, reading disk usage statistics and show in block viewer.

KDirStat (for KDE Directory Statistics) is a KDE program that sums up disk usage for direcory trees - very much like the Unix 'du' command. It also provides cleanup facilities to reclaim disk space.