See what is using space
Compare folder and file sizes in a treemap, sunburst, or ranked list to understand what is taking up space on your Mac.
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Mac Disk Space HelperA friendly way to understand Mac storageA small Mac utility
Mac disk space full?
See what’s using it.
When you see a Mac storage full or startup disk full warning, it can be hard to know where to begin. Mac Disk Space Helper scans folders you choose and shows which folders and files are using space, so you can decide what to review. It reads your files without moving or deleting them.
macOS 15 (Sequoia)+ Read-only scans
A clearer picture
Find what is taking up space on your Mac.
Choose what to review
Bring large files, installers, and archives into view. You decide what deserves a closer look and what, if anything, to do next.
Scan folders you choose
Start with a folder you select in macOS, from a personal folder to a connected drive.
You stay in control
A safe first step when you need to free up space on your Mac.
Mac Disk Space Helper scans only the folders you choose and shows the sizes of the folders and files inside. This can help you understand a Mac disk space full warning and decide what may be worth reviewing.
The app is read-only: it does not delete or move files, and it does not automatically free up space. You stay in control of any changes you choose to make in Finder.
Folders and scan results stay on your Mac.
A note on full-drive scans
Some scans take longer.
Scanning a whole drive can take several minutes. macOS may prevent access to some items; the scan reports how many items it couldn’t read. Keep an external drive connected until its scan finishes.
A few useful answers
Frequently asked questions.
Will this app automatically free up space on my Mac?
No. It helps you see what is using space in folders you choose, but it does not remove or move files. You decide what to review and what action to take.
Which Macs can run it?
Mac Disk Space Helper requires macOS 15 (Sequoia) or later.
What can I do when my Mac startup disk is full?
Start by understanding which folders and files are using space. Mac Disk Space Helper can scan folders you select and help you spot items to review. It cannot resolve every storage issue by itself.
Can I scan an entire drive?
Yes. The app warns that a full-drive scan can take several minutes. Items macOS won’t allow it to read are skipped and counted in the scan result.
Can I scan an external drive?
Yes. Select the external drive or a folder on it, and keep it connected until the scan is complete.
Need a little guidance?
Mac storage help, in plain English.
Read practical guides to storage warnings, large files, System Data, and making room safely.