Is it safe to use a storage cleaner on a Mac?

It depends on what it deletes and whether you can get it back. Peekaboo only moves files to the Trash, skips files that live only in iCloud, never offers folders a running app is using, and lets you undo any cleanup.

How much space will I get back?

It varies with the Mac. Each Clean Up card and cache shows its size before you do anything, so you know the number first.

Does it clean System Data?

The reclaimable parts: app caches, developer data, local Time Machine snapshots (with permanent removal turned on) and, on macOS 27 with Apple silicon, the Apple Intelligence models.

Is there a subscription?

No. Peekaboo is a one-time purchase per Mac, with every feature free for 14 days first.

Peekaboo · Storage cleaner

Free up space on your Mac, and keep the undo button

Most cleaners ask you to trust a big number. Peekaboo shows what each gigabyte is, explains what removing it means, and records every cleanup so you can put it back.

Download free trial14 days free · macOS 14+ · Updated November 2, 2026

What it does

See where the space went: Space Map draws the disk as a map you can click into; Disk Usage lists every folder by size, plus the space macOS frees on its own and the Apple Intelligence models filed under System Data.
Your files first: Clean Up gathers duplicates, forgotten downloads, old installers, old screenshots, big old videos and unused apps, each with what it’s worth.
Caches, explained: App caches and developer data, such as Xcode build files and simulators, are listed folder by folder. The ones with consequences you’d notice are marked Check First.
Every cleanup can be undone: Cleanups go to the Trash and are recorded as sessions. Put the last one back with ⌥⌘Z, or any earlier one from the Undo history. Nothing is removed for good unless you turn that on.

How to use it

1Open Space Map to see what’s large.⇧⌘M
2Open Clean Up and review each card before anything moves.⇧⌘K
3Changed your mind? Put the last cleanup back.⌥⌘Z

When another app fits better

Peekaboo doesn’t scan for malware or update your apps; a maintenance suite such as CleanMyMac does both. If you only want a picture of your disk and nothing else, a free visualiser like GrandPerspective will do.

Questions

Is it safe to use a storage cleaner on a Mac?: It depends on what it deletes and whether you can get it back. Peekaboo only moves files to the Trash, skips files that live only in iCloud, never offers folders a running app is using, and lets you undo any cleanup.
How much space will I get back?: It varies with the Mac. Each Clean Up card and cache shows its size before you do anything, so you know the number first.
Does it clean System Data?: The reclaimable parts: app caches, developer data, local Time Machine snapshots (with permanent removal turned on) and, on macOS 27 with Apple silicon, the Apple Intelligence models.
Is there a subscription?: No. Peekaboo is a one-time purchase per Mac, with every feature free for 14 days first.