Open Source C# Disk Space Analyzers

Sadeaner is a powerful and efficient tool for cleaning your PC. It offers a wide range of useful functions, such as the ability to remove unnecessary files and folders, free up valuable disk space, and improve the overall performance of your system. This makes it an excellent choice for gamers, as it can help to free up resources and improve the performance of games. Additionally, Sadeaner will also include advanced features such as a registry cleaner, startup manager, and browser cleaner, which can help to keep your system running smoothly and efficiently.

Are you tired of being unable to find what is using up precious hard disk space? Find that huge folder that you didn't know it was there. Select drive and press start to go through directories manually. Click the refresh button to calculate folder size, double-click to the folder name, or press "+" button to see sub folders. Deleting a folder is possible by clicking the bin button next to the folder. Increase the maximum number of folders when required. (Using more than 10 is recommended for large folders such as Program Files).

DiskGeek scans your drives and shows exactly what's eating your space, with a sortable list view and a treemap view. It finds exact duplicates (SHA-256) and near-duplicate / visually similar images using perceptual hashing, with full-text search across scan results and batch rename. Snapshot comparison shows what changed between scans over time, and scheduled, unattended scans can run from the command line for ongoing monitoring. Includes NTFS permission auditing plus CSV/HTML export. No installer bloat, no bundled offers, no telemetry, no Pro tier or upsells — 100% free. Requires Windows 10 or 11 (64-bit). Self-contained installer bundles .NET 8, ~32 MB download.

Osenpa Disk Analyzer is a free Windows disk space analyzer that helps you understand what is taking up storage on your PC. Scan all drives or inspect a single drive, then review the largest folders and files in a clean visual tree with size bars, file type labels, search, and minimum-size filtering. The app includes browser-based lookup for unfamiliar files or folders, Free Space Now cleanup for temporary files, cache locations, and the Recycle Bin, plus safeguards for protected system locations. It runs locally, does not read file contents, and supports light and dark themes with multilingual interface/search support.

Little Disk Cleaner is a open source program written in C# that removes any unneeded files to free up extra hard drive space and make windows run faster.

c² flux is an ultra-fast Windows disk space analyzer. Its high-speed scanning engine reads NTFS metadata directly from the Master File Table (MFT) and uses native Windows NT directory APIs as a fallback, avoiding slower file-by-file access whenever possible. Results are shown in sortable tree, table, pie and bar chart views and can be saved, loaded, exported or copied to the clipboard.

AtlayaView is a fast, fully local disk space visualizer for Windows. It scans one or more drives and displays used storage as a cushion treemap, making large folders and files easy to spot at a glance. Rendering is powered by a native Rust module for speed, with an automatic managed C# fallback if the native library isn't available. AtlayaView is a portable, single-file, offline tool — no cloud connection, no telemetry. It includes an optional self-updater that checks the project's own release feed and can update itself in place. Features include per-extension color profiles with an exclusive focus view, a searchable extension checklist, multi-drive scanning, and a UI available in German, English, French, Italian, and Spanish. Website: https://atlaya.capecter.com/atlayaview/ Source: https://github.com/Morfyuum/AtlayaView

List the sizes of files and folders on your computer.

The application checks each drive for free space and compares them with the threshold values designated by the user. If they are below threshold, it sends out mail to the designated addresses. Application includes two projects; a configuration form and a windows service. Service triggers every hour and sends mail if the conditions are met.

GUI is little broken - the list of duplicates is not relayeble, but this bug not affected main functionality.

On the surface, Double File may look like WinDirStat (from which it borrows code) or similar graphical drive utilization utilities: e.g. the second assembly 'Volume Treemap'. However, Double File is project-based: it saves file checksums in directory listings you store locally. It facilitates planning and transitioning between computers and operating systems: snapshot your drive and safely archive it. Listings can be searched when volumes are off site. Can read any volume mounted in Windows Explorer, including Linux and Mac volumes. Supports long path names.