See what's filling your Mac. Free up what's safe.
StorageJanitor scans your whole disk, explains every big item in plain English, System Data included, and removes only what you choose.
- Free to scan and to remove up to 2 GB in total
- $9.99 once for the full version
- For Apple Silicon Macs
Coming soon: not available to download yet. Prices are what it will cost at launch.
The first screen is an answer.
One scan of the whole internal disk, usually under a minute. Then one figure: how much is safe to delete right now, with one button to free it.
- Only what rebuilds itselfThe figure counts caches, logs and build files. Apps rebuild them when they need them, so nothing of yours is lost.
- More you could freeBelow it come suggestions: device backups, large old files, unused apps, installers and data left by deleted apps. Each has a size and a reason.
- Space macOS doesn't show youLocal Time Machine snapshots and an oversized Spotlight index are shown and explained. The full version fixes them for you.
For any Mac, and for a developer's Mac.
A Mac fills up in two ways: with years of your own things, or with copies your tools keep and never show you. StorageJanitor reads both, and treats them differently.
On any Mac
Most of it is yours: photos, messages, backups, downloads. The app says what each one is and how to make it smaller, and anything you choose to remove goes to the Trash. Only caches are deleted.
- Photos libraryKeep
- Messages and their attachmentsKeep
- iPhone and iPad backupsCheck first
- Downloads and old installersCheck first
- Apps you no longer openCheck first
- Browser cachesSafe to delete
On a developer's Mac
Build files, package caches, containers and models. Much of it rebuilds itself and can be deleted outright. Where deleting the folder would cost you something, the app says so and names the safer command.
- Xcode build filesSafe to delete
- npm, Yarn, pip and uv cachesSafe to delete
- Homebrew downloadsSafe to delete
- node_modules in old projectsCheck first
- Docker's diskCheck first
- AI models from Hugging Face and OllamaCheck first
System Data, opened up.
macOS shows System Data as one grey block with no way in. StorageJanitor splits it into app data, caches, system files and logs, then lists the biggest things on your Mac with what each one is.
- App data22.6 GB
- App caches13.1 GB
- System files9.4 GB
- Logs1.3 GB
System Data46.4 GB
Every gigabyte gets a name.
One bar for the whole disk, sorted into categories. Under it, the biggest things on your Mac, whatever folder they're in.
- The whole disk adds upEvery gigabyte lands in a named category. Space the app couldn't read is shown as such, not hidden.
- Plain names, not folder paths"Chrome cache" and "iPhone backup", with the real path one click away.
- Measured the way Finder measuresSizes are bytes on disk, in decimal GB. The System Data figure is added up from the files themselves, so it won't match System Settings exactly.
Is it safe to delete? Every item gets a verdict.
You shouldn't need to know what a folder is to decide about it. Each item says what it is, why it is or isn't safe to remove, and what happens if you do.
- Safe to delete
- Apps rebuild it, or it was already in your Trash. It is deleted, or moved to the Trash if you'd rather be able to undo it.
- Check first
- You might want it. It only ever moves to the Trash, where you can drag it back out.
- Keep
- Your files, app data and system files. It can't be selected. The one exception: uninstalling an app takes that app's own data to the Trash with it.
- Photos libraryYour photos and videos. StorageJanitor never removes it.Keep48.2 GB
- Messages attachmentsPhotos and files from your conversations. Never removed.Keep7.6 GB
Frees nowMoves to the Trash
Example sizes from a demo scan; yours will differ. Ticking a box here changes nothing on your Mac.
Nothing is removed without you seeing it first.
One button frees everything marked safe. Before it runs, you get the exact list.
- Deleted, or moved to the TrashCaches, logs and what is already in your Trash are deleted. Everything else is moved to the Trash, where you can drag it back out; the space is freed when you empty it.
- Open apps are left aloneIf StorageJanitor can see that an app is open, its files are skipped until you quit it.
- A record of every removalHistory lists what was removed, when, and where it was.
- Clear about what it touchesWhat it removes and what it leaves alone, in plain words.
- Nothing leaves your MacNo account and no telemetry. The only network request is the update check. The sizes from your last few scans are kept on your Mac, so it can show what grew.
How it compares.
Two well-known Mac storage apps, and where StorageJanitor differs. Their columns say only what their own pages say, checked 1 October 2026.
| StorageJanitor | DaisyDisk | CleanMyMac | |
|---|---|---|---|
| Price | Free to scan; $9.99 once for everything | $9.99 once, free trial, up to 5 personal Macs | 7-day free trial; $39.99 a year or $9.99 a month |
| What it is | Storage explainer with safe removal | Visual disk map | All-in-one cleaning, malware and performance suite |
| Says what is safe to delete | Yes, a verdict and a reason on every item | No per-item verdict; system files are protected and you judge the rest | Its listing says it trims outdated caches, broken downloads and logs |
| Subscription | No | No | Yearly or monthly; a one-time purchase is also listed |
Sources: daisydiskapp.com and the US Mac App Store, 1 October 2026.
Free to scan. $9.99 once for everything.
Scanning is free, and so is removing up to 2 GB in total. One price unlocks the rest. No subscription and no account.
Free
$0
See everything on your disk, and try removal.
- Scan the whole disk, with the System Data breakdown
- A verdict and a reason on every item
- The Trash and installer suggestion lists
- Remove up to 2 GB in total, one time, including uninstalling apps
Full version
$9.99once
Everything in Free, and:
- Removal with no limit
- Fixes for snapshots and the Spotlight index
- Every suggestion list: old backups, large old files, unused apps, leftovers, developer files and build folders
- What grew since an earlier scan
- A low-disk warning
Questions.
What does StorageJanitor do?
StorageJanitor is a Mac app that shows what is using your disk, explains each item in plain English (including System Data), says what is safe to delete, and removes only what you choose. Free to scan and to remove up to 2 GB in total; $9.99 once for the full version.
What is System Data on a Mac?
System Data is the label macOS gives to everything it can't sort into another category: app data, caches, logs and system files. StorageJanitor splits it into those parts and lists the biggest items in each. Read the full explanation.
Will it delete my files?
Only what you select. Before anything is removed you see the full list with sizes. Caches, logs and what is already in your Trash are deleted. Everything else goes to the Trash. Items marked Keep, such as your Photos library and Messages history, can't be selected. The one exception: when you uninstall an app, that app's own data goes to the Trash with it.
How do I get something back after removing it?
If it went to the Trash, open the Trash from the Dock and drag it back to where it was; History in the app shows where each item used to be. Caches, logs and items that were already in the Trash are deleted for good and can't be restored. Apps rebuild their caches and logs on their own.
How much does it cost?
Scanning is free, and so is removing up to 2 GB in total. The full version is $9.99, paid once: it removes the limit and adds the fixes for snapshots and the Spotlight index, every suggestion list, what grew since an earlier scan, and the low-disk warning. There is no subscription and no account.
Do I need to be technical to use it?
No. Every item has a plain name, a verdict and a reason, and nothing is removed until you have seen the list.
Does it help with developer tools?
Yes. It recognizes Xcode build files and simulators, Docker, the npm, Yarn, pip, uv and Homebrew caches, node_modules and other build folders, and AI model stores such as Hugging Face and Ollama, each with a verdict. What is safe to delete on a developer's Mac.
How long does a scan take?
Usually under a minute for the whole internal disk.
Which Macs does it work on?
Macs with Apple Silicon (M1 and later). It scans the internal disk; external drives aren't supported.
Why does it ask for Full Disk Access?
macOS keeps some folders private, including Photos, Mail and Messages. With Full Disk Access the app can read their sizes. It never opens the contents of your files, and it still works without the permission; it then shows that space as not checked.
Does it send anything from my Mac?
No. There is no account and no telemetry. The only network request is the check for app updates.
When can I download it?
Soon. StorageJanitor isn't available to download yet, and this page will have the download when it is.
How do I uninstall StorageJanitor?
If you turned on the low-disk warning, turn it off in Settings first. Then drag StorageJanitor from Applications to the Trash. To remove its own files too (the removal history, your license key and the sizes from past scans), delete the folder ~/Library/Application Support/StorageJanitor. One small note stays on the Mac: how much of the free allowance has been used, so that reinstalling doesn't reset it.
How is it different from DaisyDisk and CleanMyMac?
DaisyDisk shows a map of your disk, protects system files and leaves the rest for you to judge. CleanMyMac is an all-in-one suite that also covers malware and performance, sold by subscription or as a one-time purchase that covers one major version. StorageJanitor does one job: it explains each item, gives it a verdict, and removes what you choose, for a one-time price. See vs DaisyDisk and vs CleanMyMac.
See what's filling your Mac.
Scanning is free. Nothing is removed until you've seen the list.
- Free to scan and to remove up to 2 GB in total
- $9.99 once for the full version
- For Apple Silicon Macs
Coming soon: not available to download yet. Prices are what it will cost at launch.