WhatSize review
A focused Mac disk analyzer with cleanup tools, duplicate detection, and a low one-time cost.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
WhatSize is a macOS utility for measuring and managing storage across drives, volumes, folders, and files. It suits Mac users who want to inspect where space is going, find duplicate files, and remove selected categories of disposable data without subscribing to a recurring plan. Its scan results can be viewed in browser, outline, table, and pie-chart formats, with sorting and filtering for narrower inspection. The scope includes applications, files, folders, Time Machine volumes, and mounted or external volumes.
Pricing is straightforward. The Purchase plan costs $14.99 one time and provides a direct license purchase, while the Upgrade plan costs $9.99 one time for existing users. A 30-day trial gives prospective buyers time to evaluate the utility before paying. The paid feature set includes cleaning tools for logs, downloads, caches, unused application translations, and other removable files, along with duplicate-file detection. Administrator-level measurement is available with Full Disk Access, which can extend visibility across the Mac's storage. Users can export selected files and folders as CSV or TSV for further review.
WhatSize also fits workflows that move between Finder, Time Machine, Numbers, and Microsoft Excel. That combination makes it useful for storage audits that need more than a single visual scan, particularly when external volumes or backups are part of the picture. Its focus is narrower than a general Mac maintenance suite: it centers on storage measurement, inspection, and cleanup. Buyers who need a macOS-only disk analyzer with app-size views and a one-time license should consider it. Those requiring Windows support, a free plan, or treemap-based analysis should choose another tool.
WhatSize pros and cons
- Where it wins
- Measures drives, volumes, folders, and files with multiple views
- Finds duplicates and cleans logs, downloads, caches, and translations
- Supports Time Machine, external volumes, CSV, TSV, Numbers, and Excel
- Where it doesn't
- Available only for macOS
- Requires a paid purchase after the 30-day trial
- Offers pie-chart views but no treemap or file-type usage breakdown
WhatSize fact sheet, pricing and score →
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