It looks. It doesn't touch.
Every folder, including the ones Finder hides.
Scanning Applications31 GB
Scanning simulator runtimes64 GB
Scanning ~/dev27 GB
Scanning Docker20 GB
Nothing moved444 GB found
Where did all your disk space go?
Diskling looks through your Mac, tells you in plain words what's filling it, and gets the space back without breaking anything.
A native Mac app, in the works. Beta invites go out by email.
Diskling
Home –
Space
Clean 38 GB
Apps
Cloud
Guardian
Starting scan…
0 GB used460 GB free
Xcode simulators8 copies of iOS, 6 unused since 2025
Rebuilds when needed64 GBOld project buildsnode_modules in 165 folders
Safe to remove27 GBDockerOld images and build cache
Review first20 GBRechecked: 5 runtimes are still on disk Where?
Your tray is emptyReclaim
"System Data" is not an answer.
macOS lumps hundreds of gigabytes into one gray bar. Keep scrolling.
212 GBwith no explanation
64 GBXcode simulators
27 GBnode_modules
0.8 GBTrae leftovers
20 GBDocker
8 GBnpm cache
2 GBSwap and sleep files
Same disk, same 212 GB. Now every piece has a name, a size, and an honest answer about whether it's safe to clear.
From full to fine,
in six steps
Keep scrolling. This is a whole cleanup in Diskling.
One sentence, not a pie chart
The biggest cause first, with the owners behind it.
Xcode simulators use 64 GB. You haven't opened 6 of the 8 since 2025.
node_modules, 165 folders27 GB
Trae leftovers0.8 GB
Docker20 GB
Ask about anything
What it is, who made it, what happens if it goes.
Why? · Xcode simulatorsCopies of iOS that Xcode uses to test apps. Each is 7 to 8 GB.If removed: Xcode downloads them again when you need one.Rebuilds when neededOwner: Xcode 27.0
Safe things, one tap
Anything that can't come back on its own waits for you.
Xcode simulators
Rebuilds48 GBTrae leftovers
Safe0.8 GBnpm cache
Safe8 GBDocker images
Review20 GBCleaned the right way
Each tool's own command, shown to you before it runs.
# Xcode simulators$ xcrun simctl runtime delete 34EF0938…$ xcrun simctl runtime delete 19CF029A…+ 4 more# npm cache$ npm cache clean --force# Trae leftovers → Trash
Space back. Then it keeps watch.
Undo or restore. A ring in the menu bar warns you early.
17 GB back
Free now33 GB
At this rate, full in about5 months
Biggest grower this weekDocker, +6 GB
Tap a folder.
Get a straight answer.
The folders that quietly fill a Mac, explained the way Diskling explains yours.
Tap any folder. I'll tell you what it is.
Why I'm building Diskling
On September 29, at 2:38 in the afternoon, my MacBook stopped responding for a minute and a half, then restarted on its own. The crash log had three words buried in it: LOW swap space.
The disk was 97% full, and System Settings said most of it was "System Data". Even Obsidian slowed down, because iCloud had moved 581 of my 583 notes off the Mac to make room.
An hour of Terminal commands later, I found eight copies of iOS that Xcode had kept for testing. 64 GB, not 186. Good disk tools showed me where the space went. None told me what it was, or how to remove it safely.
So I'm building the app I wanted that afternoon.
Shameem RezaMaking Diskling, in public
panic-full-2026-09-29-143851.panic14:38:51
panic(cpu 2 caller 0xfffffe0051bef250):
watchdog timeout: no checkins from watchdogd in 92 seconds
Compressor Info: 9% of compressed pages limit (OK)
and 70% of segments limit (OK) with 13 swapfiles and LOW swap space
$ df -h /System/Volumes/Data
Size Used Avail Capacity
460Gi 405Gi 16Gi 97%
$ du -sh /Library/Developer/CoreSimulator
186G /Library/Developer/CoreSimulator
# what is Volumes/? is it safe? how do I remove it?
diskling › Xcode simulators use 64 GB.
diskling › 6 of 8 unused since 2025. Xcode can download them again.
One app for the whole job
Finding space, cleaning it, uninstalling apps, and keeping watch usually takes three or four apps. Diskling does it in one window.
Rules that stay on
A cleanup app you can't trust is worse than a full disk. These aren't settings. Try turning one off.
Nothing is deleted outright
Files go to the Trash, and every cleanup has a way back.
You see the command first
When Xcode or Docker has its own cleanup tool, Diskling uses it and shows you what will run.
Your stuff is off limits
Documents, your Photos library, and chat histories are never suggested.
Nothing risky is picked for you
Anything that can't come back on its own is marked "Review first".
Your files stay on your Mac
No account, no tracking, no uploads.
No scare tactics
No "speed up your Mac" tricks and no red warnings. Just your disk, explained.