Choose a folder. DiskCT maps allocated size in a Treemap, explains hard links, sparse and compressed files, skips cloud placeholders, and reports every blind spot.
DiskCT does one job: show where space is used now, without deciding what you should delete.
See space allocated by the file system instead of treating logical file size as local usage.
Treemap, hierarchical List, Large Files, and File Types, with search, sorting, and drill-down.
Count hard-linked data once and identify sparse, compressed, and cloud-only content.
Permission failures and unreadable metadata are listed clearly, never disguised as empty folders.
Scan file-system metadata and skip cloud-only placeholders instead of reading file contents.
No account, ads, or analytics SDK. Clear the scan index, authorized locations, and settings anytime.
No subscription, ads, or in-app purchases. Core scanning, accurate size reporting, and analysis stay available to everyone.
Click Choose Folder and authorize it in the system panel, or drop a folder directly into DiskCT.
No. The App Store build is sandboxed and accesses only locations you explicitly select and authorize.
DiskCT analyzes metadata and attempts to skip cloud-only placeholders instead of reading file contents to calculate local usage.
No. DiskCT is an analyzer. It does not recommend deletions, select files automatically, or perform bulk cleanup.
No. Paths, scan results, and settings stay on your Mac and can be cleared under Settings > Data.
macOS 14 and later, on both Apple silicon and Intel Macs.