Plain-language explanations
Everything, explained.
Pick anything on your Mac to see what it is, where it came from, when you last opened it and what grew this week, written for people, not engineers.
Finally understand what's on your Mac.
Diskly explains every file, folder and gigabyte in plain words, even System Data. Then it helps you safely clear only what you don't need.
Free during early access · macOS 14 Sonoma or later · Apple silicon
The problem
“System Data: 98 GB.”
Your Mac never says what that means.
Storage settings show a grey bar and a number. Cleaner apps show a big Clean button. Neither tells you what's actually there, so you either delete blindly, or you're too worried to delete anything at all.
1
Diskly explains.
Every part of your storage gets a name and a plain-language explanation: what it is, which app it belongs to, and whether it's safe to remove.
2
It stays honest.
No scary warnings, no “junk” counters, no one-click cleaning. Diskly suggests something only when it's sure, and always tells you why.
3
You decide.
Nothing is deleted until you choose it and confirm. Even then, you can take it back with Undo.
Works right inside Finder
Wondering about a folder? Just ask.
Right-click any folder or file in Finder and choose Explain with Diskly. Diskly opens it, measures what's inside and tells you what each thing is, without you hunting for it first. You can also drop a folder on Diskly's icon in the Dock.
node_modules
System Data, demystified
See the whole picture.
The rings break your used space into the parts that make it up: macOS itself, your files, your apps, and the caches, backups and developer files hiding in System Data. Click any part to look inside, as deep as you like.
Suggestions
Advice you can trust.
Caches apps rebuild by themselves. Installers for apps you already have. Archives you've already unpacked. Diskly only suggests what it's sure about, and explains each one.
Collector
Decide first. Then act, with Undo.
Tick what you've decided to remove, anywhere in Diskly. When you're ready, delete it all together and the space is freed straight away. If you change your mind, Undo is right there.
Safety first
You can't break your Mac by accident.
Understanding only helps if acting on it is safe. Diskly draws hard lines around what it will touch, and shows its work.
Looking changes nothing
Scanning only reads. Nothing is deleted unless you choose it and confirm.
Protected stays protected
macOS, your Library, hidden settings, standard folders and app libraries like Photos are never offered for deletion.
Checked again, right before
Every item is re-checked the moment it's deleted. If its app is open, or it changed, it's skipped.
Undo, every time
Each delete waits a few seconds, so you can take it back with one click or ⌘Z. And once you confirm, it's never lost halfway, even if Diskly quits.
A record of everything
Recently Deleted lists what was removed, from where, and how much space it freed.
Private by design
Diskly works entirely on your Mac. No account, no tracking, and nothing about your files ever leaves your computer.
Stay in the know
Your Mac, no longer a black box.
- What grewSee what changed since last week, and where.
- Big and forgottenLarge files you haven't opened in over a year.
- LeftoversData still here from apps you've already deleted.
- DuplicatesIdentical files, with one copy always kept.
- UninstallerRemoves an app along with what it left in your Library.
- SearchFind any file by name and see where it sits.
- Menu barFree space at a glance, with a heads-up before you run out.
- Move, don't deleteSend big files to an external drive, with Move Back if you change your mind.
- Feels like a Mac appQuick Look, Open With, drag and drop, keyboard shortcuts, VoiceOver and dark mode.
Beta
Help shape Diskly.
Join the beta and get Diskly Pro free for life, plus an email whenever a new version is ready. Non-technical testers are especially welcome.
Pricing
Understanding is free.
See and understand everything on your Mac at no cost, forever. Pro adds the tools to act on it safely. Diskly is free during early access, and Pro will include a 7-day free trial.
Diskly
Free
Understand your Mac. Forever.
- Plain-language explanations
- System Data, broken down
- Overview rings and folder maps
- What grew and big, forgotten files
- Search
- Explain with Diskly, in Finder
Launch price
Diskly Pro
$14 $19
Act on it safely. One-time purchase, no subscription.
- Everything in Free
- Collector, delete with Undo
- Suggestions you can trust
- Uninstaller and leftovers
- Duplicates
- Menu bar warnings
During early access, Pro features are included free.
Questions
Good to know.
How is Diskly different from a Mac cleaner?
Cleaners want you to press one button and trust them. Diskly does the opposite: it explains what everything is, suggests only what it's sure is safe, and leaves the decision to you. Many people use it just to understand their Mac and never delete a thing.
What is “System Data”?
It's macOS's catch-all for everything that isn't an app or a regular document: app caches, developer files, iPhone backups, local Time Machine snapshots, logs and more. Diskly measures the places known to fill it up, explains each one, and shows how to free it properly.
Is Diskly safe to use?
Yes. Scanning only reads. Diskly never offers to delete macOS, your Library, hidden settings, standard folders or app libraries like Photos. Everything you delete is re-checked first, and you get a few seconds to undo.
Why does Diskly ask for Full Disk Access?
Some places, like Mail and app containers, are protected by macOS. With Full Disk Access, Diskly can measure and explain them too. It's optional: without it, Diskly simply skips those places and never shows a stream of permission prompts.
Does deleting go to the Trash?
No. Deleted items are removed straight away, so the space is freed immediately, but only after a short Undo window. Recently Deleted keeps a record of what was removed.
Does Diskly collect any data?
No. There's no account, no analytics and no network access. Your files and their names never leave your Mac.
How do I install Diskly?
Open the downloaded file and drag Diskly into your Applications folder, then open it from there. Running it from Applications is also what adds Explain with Diskly to Finder's right-click menu (under Quick Actions or Services).
The first time you open it, macOS asks whether you're sure you want to open an app downloaded from the internet. It asks this for every downloaded app, so click Open. Diskly is signed and notarized by Apple. macOS then asks permission for your Desktop, Documents and Downloads folders, which Diskly needs in order to measure them. Nothing is changed unless you confirm it.
Which Macs does it run on?
Apple silicon Macs (M1 and later) on macOS 14 Sonoma or later. The download is arm64-only — not a universal binary — so Intel Macs aren't supported yet.
Know your Mac.
Diskly explains. You decide.
Free during early access · macOS 14 or later · Apple silicon