OwlDisk review
A free visual disk scanner for Mac, with directory drill-down and trash deletion.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
OwlDisk is a free, open-source disk space analyzer for macOS, aimed at Mac users who want a visual way to find where storage is going. It can scan an entire disk or a selected folder, then represent usage in an interactive sunburst. Directory-depth drill-down and file and folder size reporting help narrow a scan from a broad view to individual items. The app runs locally on macOS 11 and later, with a universal binary for Apple Silicon and Intel Macs. Its scope is focused on identifying and reviewing disk usage rather than providing a broader set of reporting views.
The scanning and navigation are its central strengths. Parallel disk scanning is paired with the sunburst visualization, while drill-down lets users inspect directories at different depths. OwlDisk also detects when Full Disk Access may limit scan accuracy, a useful signal when interpreting results: access permissions can affect what a scan sees. After identifying unwanted items, users can drag files and folders to the trash. That makes the workflow practical for locating large items and deciding what to remove, though deletion remains a user decision rather than an automated cleanup process.
OwlDisk is open source and free, with no paid plan described; its published scope is a desktop app for macOS, not a cross-platform tool. It has a sunburst rather than a treemap, and the described capabilities do not include verified exports or a file-type breakdown. Documentation is the stated support channel. Choose OwlDisk if a free local scan, visual directory exploration and manual removal fit your Mac workflow. Users who need Windows or Linux support, alternate visualizations, or more reporting breadth should look for a different analyzer.
OwlDisk pros and cons
- Where it wins
- Parallel scanning pairs with an interactive sunburst view.
- Drill down by directory and inspect file and folder sizes.
- Runs locally as a universal Apple Silicon and Intel app.
- Where it doesn't
- Available for macOS only, not Windows or Linux.
- Uses a sunburst rather than a treemap view.
- No verified export or file-type breakdown is described.
OwlDisk fact sheet, pricing and score →
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