Find your missing disk space, faster than light
A free disk usage analyser for macOS, Windows and Linux that shows where the space went while it is still looking — including what only turned up last week, which is usually the thing you are hunting for.
Free. macOS 15 or later · Windows 10 or later · Linux
The disk was fine last month
Then something arrived and filled it. Every folder carries four numbers here, not one, so the whole disk can be ranked by what is new rather than by what is merely big — and whatever turned up last week rises straight to the top.
The classic view. Everything ranked by what it occupies right now.
Only what was written in the last 30 days. The answer is usually here.
The slow creep you never notice until the day the disk is full.
Scan, run the build or the sync, scan again, and see exactly what it left behind.
Both the list and the map follow whichever measure you pick, so a folder that looks harmless by total size can become the biggest thing on screen the moment you ask what is new.
About that speed
A home folder of 3.8 million files, measured end to end in under half a minute — and the first results are on screen a second after you press go.
* Measured on an M1 MacBook Pro Max with a 1 TB drive.
What it does
Results while it scans
A partial tree and map are on screen within a second of starting, and sharpen as the walk proceeds. Nothing waits for the end.
A map of the whole disk
Every file drawn in proportion to its size and coloured by kind. Selecting a folder outlines it in place, so drilling down walks the highlight into the same picture rather than replacing it.
Nothing leaves your machine
No account, no tracking. What is on your disk stays a matter between you and your disk.
Honest numbers
Hard links are counted once, and logical size is tracked separately from space actually occupied. On a developer machine those two figures differ enormously.
Sorted by what matters
Folders ranked by size with the size column pinned, so it stays visible however deep the names get. Every file kind aggregated and sortable.
Scriptable
The same engine ships as a command line tool, for scanning, verifying totals and benchmarking your own hardware.
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Questions
Is Disk Space free?
Yes. It is free to download and use, with no account, no subscription and no trial period.
Which versions of macOS does it run on?
macOS 15 or later, on both Apple silicon and Intel Macs. There are Windows and Linux versions as well.
Is there a Windows version?
Yes, for Windows 10 or later. It is called Disk Space ++ there, because the plain name was already taken on the Microsoft Store — it is otherwise the same application. The download is a single file with nothing to install and no runtime to install either, and it counts hard links, sparse files and compressed files the way the disk itself counts them.
Why does it ask for Full Disk Access?
macOS hides folders like Mail, Messages and Photos from apps that have not been granted Full Disk Access. Without it the scan still runs, but those folders are skipped and the totals come out lower than the real figure. The app tells you when the permission is missing.
Does it send anything about my files anywhere?
No. Every measurement stays on your computer. The only network request the app makes is asking the website whether a newer version has been released, which sends nothing but the version and platform it is running.
How long does a scan take?
A home folder of 3.8 million files takes under half a minute on an M1 MacBook Pro Max. Results appear while the scan runs rather than at the end, so the largest folders are usually visible within a second of starting.
How is it different from using du in the terminal?
It reads the same figures — totals are verified byte for byte against du and find — but draws every file in proportion to its size, counts hard links once, and lets you rank folders by what arrived recently rather than only by what is big. A command line tool ships alongside it if you prefer the terminal.
Can it delete files?
It can move a selected file or folder to the Trash, after asking. Nothing is deleted outright, and nothing is removed without you choosing it.
What does “added in the last month” mean?
Every folder carries four figures: its current size, and how many bytes arrived in the last month, the last six months, and since you last scanned that folder. Ranking by one of those shows what has been growing, which is usually what filled the disk.