MacStorageAtlas is a native disk usage analyzer for macOS — a free WinDirStat, DaisyDisk, and GrandPerspective alternative for Apple Silicon and Intel Macs. Wondering what is using my disk space on Mac? Scan any folder or volume and see the results as a sortable folder tree and an interactive treemap, so you can find the space hogs and free up gigabytes in seconds.

MacStorageAtlas folder tree and interactive treemap of a scanned folder

Features

🗺️ Tree + treemap

Two synchronized views: a folder tree sorted by size and a proportional treemap where the biggest blocks are the biggest consumers.

⚡ Live progress

Async scanning streams paths, file/folder counts, and bytes as it runs. Hundreds of thousands of files stay responsive — cancel anytime.

📊 By file type & largest files

Dedicated tabs for which file types take the most room and the single biggest files on disk, with counts and full paths.

🧹 Safe cleanup

Reveal any item in Finder or move it to the Trash after a confirmation — nothing is permanently deleted by accident.

☁️ Cloud-aware on-disk size

Measures the space files actually occupy, so undownloaded iCloud/OneDrive/kDrive placeholders count as roughly zero.

⚙️ Configurable scanning

Toggle hidden files, symbolic links, and .app bundle expansion. Preferences and recent locations are remembered.

How it compares

	MacStorageAtlas	DaisyDisk	GrandPerspective	WinDirStat
Platform	macOS (arm64 + x64)	macOS	macOS	Windows
Price	Free & open source	Paid	Free	Free
Treemap view	✅	✅	✅	✅
Folder tree	✅	—	—	✅
File-type breakdown	✅	—	—	✅
Real on-disk size (cloud-aware)	✅	—	—	—

Live progress on huge volumes

Scanning is fully async and streams the current path, file and folder counts, and bytes scanned as it runs — hundreds of thousands of files stay responsive, and a single click cancels while partial results stay visible.

MacStorageAtlas live scan progress overlay showing current path, file and folder counts, and bytes scanned

Answer the two questions that matter

The same scan, two tabs: which kinds of files take up the most room? and what are the single biggest files on disk? — each with counts, sizes, and full paths.

Storage grouped by file extension, with file counts and sizes — Breakdown by file type

List of the largest files on disk with full paths — The single largest files on disk

Note: builds are not code-signed or notarized (no paid Apple Developer account), so Gatekeeper blocks the app on first launch. Right-click the app in /Applications → Open, or run xattr -dr com.apple.quarantine /Applications/MacStorageAtlas.app. Only do this for builds you trust.