See what's eating your disk
A fast, open-source disk space analyzer for macOS. Scan your drive in seconds and explore storage usage with an interactive sunburst chart.
The fastest way to analyze disk space on macOS
Wondering what's taking up space on your Mac? OwlDisk is a free, open-source storage analyzer that scans your entire drive and shows exactly where your disk space is going. Works on macOS Monterey, Ventura, Sonoma, and Sequoia.
Blazing Fast
Parallel scanning with 64 concurrent goroutines. Scans a full 500 GB disk in seconds.
Interactive Visualization
Sunburst chart with 3 levels of depth. Click to drill down, click center to go back up.
Accurate Sizes
Reports the same numbers as macOS Finder and About This Mac, including purgeable space.
Quick Cleanup
Drag files and folders to the trash zone to free up space without leaving the app.
Privacy First
Runs entirely on your machine. No data leaves your computer. Fully open source.
Native Performance
Universal binary for Apple Silicon and Intel. No Electron, no web views — native macOS app.
Built with
Modern tools for a native experience