Disk Space Analyzer for Mac
Find large files, delete duplicates, free up storage. Sift draws your whole disk as one map you can read in a second, then lets you take the space back — one folder at a time.
System files and app data macOS keeps private. Counted in your totals, but no app can read or remove them.
What's taking up space on my Mac?
On most Macs the space sits in four places: downloads you never cleared, photo and video libraries, app and developer caches, and the System Data macOS keeps to itself. Sift measures all four in one pass and puts the largest folder first.
Installers for apps you already have, superseded macOS images, zips opened once.
Libraries are packages. Sift measures inside them without breaking them open.
Regenerable by design. Apps rebuild what they need the next time you open them.
The bucket Finder can't name. Sift splits it into what you can remove and what macOS seals.
Free up disk space on Mac without guessing
Every delete is a decision, and a decision needs evidence. Sift gives you the evidence, then stays out of the way.
One pass over the whole volume, measured byte by byte rather than estimated. The list of folders is the progress bar. Scanning and browsing stay free forever.
Every folder sized to scale, three rings deep. Click a slice to go into it, or switch to fixed size bands — 1 GB and up, then everything below folded away.
Nothing is pre-selected and nothing is deleted outright — files go to the Trash, and ⌘Z puts the last move back where it came from.
Duplicate file finder for Mac
Matched byte for byte, not by name — so a renamed copy still gets caught and two different files that happen to share a name never do.
One copy of every file is always kept. Sift never leaves a group empty.
Clear System Data on Mac — and see what “Other” storage really is
When macOS says your storage is full and 60 GB sits under System Data, Finder stops explaining. Sift splits that bucket into rows you can act on: iOS backups, Time Machine local snapshots, developer caches, disk images — and the sealed system files no app is allowed to touch.
Built to be trusted with your whole disk
Sandboxed and Mac App Store notarized
Sift ships only through the Mac App Store, which means it runs in Apple's sandbox and is reviewed and notarized before it reaches you. It can read what you grant it and nothing else. Deletes go to the Trash — never a background process, never a “one-click optimizer” reaching into your system.
Free space in the menu bar, the folders growing fastest this week, and a nudge before you hit the last 10%.
Over 1 GB and untouched for six months, with the date you last opened each one. Nothing pre-selected.
Why deleting 40 GB sometimes frees nothing — iCloud placeholders and local snapshots, told apart from real files.
Sift, DaisyDisk and CleanMyMac
Three apps that overlap without doing the same job. Here is the honest split.
One plan. $19.99 a year.
No tiers, no add-ons, no upsell inside the app. Scanning and browsing your disk are free forever — the yearly plan is for taking the space back.
See everything included →Questions people actually ask
What's taking up space on my Mac?
Usually four things: downloads you never cleared, photo and video libraries, app and developer caches, and System Data. Sift measures every folder on the volume in one pass and sorts by size, so the answer is the first row instead of a guess.
How do I free up disk space on Mac?
Measure first, then remove a few large things rather than many small ones: old installers, exported video, duplicate copies, stale build caches. Send them to the Trash so the decision stays reversible, and empty it when you're sure.
What is System Data on Mac, and can I delete it?
It's what macOS shows for everything it can't file elsewhere: caches, logs, disk images, iOS backups, Time Machine local snapshots, Xcode data. Some of it is safe to remove and some is sealed by macOS. Sift shows which is which — the locked part appears hatched, counted but untouchable.
Does Sift find duplicate files on Mac?
Yes, matched byte for byte rather than by name. Copies are grouped, one copy of every file is always kept, and you choose whether the keeper is the filed copy, the newest or the oldest.
Is it safe? Why does it want full disk access?
To measure a folder Sift has to be allowed to see it. It reads sizes, names, paths and dates — and a file's contents only when you press Space to preview it. It's sandboxed, distributed only through the Mac App Store, and makes no network calls at all.
How much does Sift cost?
$19.99 a year, one plan, Family Sharing included. Scanning and browsing are free forever, so you can see what Sift finds on your own disk before paying anything.