Choose a Mac Disk Space Analyzer

The right Mac disk space analyzer depends on the question you are trying to answer. “How much space is left?” needs a disk overview. “Which project is largest?” needs folder totals. “Where is that huge file?” benefits from a tree or visual map.

This comparison is published by DiskTreeSize's developer. Product descriptions were checked against official sources on October 19, 2026. The recommendations below concern workflow, not an independent speed benchmark.

Compare by the result you want

For competitors' current requirements and purchase terms, use the GrandPerspective and DaisyDisk websites. Different editions or distribution channels can have different capabilities. No single app in this table is the best fit for every storage problem.

Start with macOS when you need the overall picture

On macOS 13 or later, open System Settings → General → Storage. This is a useful first stop when you need the available capacity or a category overview. Apple's storage guide covers its built-in options.

If you already know which folder to inspect, select it in Finder and press Command-I to open Get Info. That may answer a one-off question without installing another app.

The next step is different: when one project contains many large subfolders, use a tool that makes those branches easy to compare. For a text-only approach, see the Mac du guide.

Choose DiskTreeSize when folder rows matter

DiskTreeSize is a practical starting point if you used TreeSize on Windows and want to expand folders, compare sizes, and keep a visual map nearby.

Actual screenshot of a prepared demonstration directory, shown with the Chinese interface. The folders and capacities are examples. 实际占用 corresponds to Allocated, and 逻辑大小 to Logical.

Click Choose Location, select Downloads or a project, then click Analyze. Sort by size and expand the largest branch. This lets you distinguish one large export from a directory containing many smaller files.

The free download includes scanning, the tree, size sorting, visual views, name search, and extension statistics. Pro adds Finder navigation, CSV / JSON reports, and confirmed moves to Trash. It requires macOS 12 or later and supports Apple Silicon and Intel Macs.

For size-range filtering, duplicate-content detection, or scheduled jobs, check other tools against your requirements: DiskTreeSize does not provide those features. If you want a closer walkthrough, read TreeSize for Mac.

Choose a map-led app when shapes are easier to read

GrandPerspective focuses on rectangular file maps and offers configurable filters. DaisyDisk uses a circular view for exploring storage. Try the style that makes folder relationships easiest for you to follow; a map preference is a usability choice, not evidence that one tool scans faster.

Compare the same familiar folder when evaluating tools. Check whether you can read its names, follow its largest subfolder, and return to the file's location. You do not need a full-drive scan to decide whether the navigation works for you.

Compare the same scope and size measurement

An app's folder total and macOS's disk-wide storage overview can differ because they cover different locations. Protected folders can also be unreadable.

File length and allocated storage are different measurements. Shared data and sparse files can make them diverge, so a displayed total is not a guaranteed cleanup result. The allocated versus logical size guide explains this with an example.

Start with the built-in tools for a quick total. Choose a tree when you want to compare branches, or a map when you prefer to explore visually. If a tree and map together suit your work, try DiskTreeSize's free analysis on the folder you want to understand.