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System Junk

Clear cache on your Mac. Keep what you need.

System Junk finds the caches, logs, crash reports and temporary files that build up on every Mac, rates each one, and preselects only what apps and macOS rebuild by themselves.

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Free scan No account needed macOS 14 Sonoma or later Apple silicon and Intel

Roomy is a paid app. The free version scans everything and cleans up to 500 MB.

Illustration with example data.

What System Junk finds

Eight kinds of system junk, each in a known location. Every row in the app names the item, what is removed, what stays and where it lives, so you can clean system junk on your Mac without guessing.

  • App caches

    ~/Library/Caches

    Files apps save so they load faster. Each folder is matched to its app, so you see “Slack”, not a bundle ID. Rated Safe, or Review if the app is open or the cache is over 1 GB.

  • Browser caches

    ~/Library/Caches

    Cached web pages, images and scripts from Chrome, Firefox, Safari, Brave, Edge, Arc, Opera and Vivaldi, shown once per browser. Bookmarks, passwords, history, open tabs and logins stay.

  • Sandboxed app caches

    ~/Library/Containers/…/Caches

    Caches inside App Store apps’ containers. Read only when you give Full Disk Access, and only the Caches folder’s contents are removed.

  • Logs

    ~/Library/Logs

    Log files apps write for troubleshooting. Nothing else changes when they go.

  • Crash reports

    ~/Library/Logs/DiagnosticReports

    Reports from apps that crashed or froze. Useful to developers, rarely to you.

  • Old temporary files

    Your temporary folder

    Only files nothing has touched for three days or more. Files apps are using right now stay.

  • Saved window state

    ~/Library/Saved Application State

    Which windows each app had open. Rated Review: apps simply open with fresh windows afterwards.

  • Shared caches and logs

    /Library/Caches, /Library/Logs

    Only the items your user account owns. Everything else there belongs to macOS or an administrator and is skipped. Rated Review.

Never touched

Caches go. Your stuff stays.

Cleaning system junk should never cost you a login or a setting. These are skipped or protected every time.

  • Browser profiles. Bookmarks, passwords, history and cookies live in Application Support, which System Junk never touches.
  • Caches macOS relies on. iCloud sync state, downloads in progress, Home, Family and Find My caches are skipped entirely.
  • Apps that are open. Their caches move to Review with a note to quit the app first, so nothing is pulled out from under it.
  • Unusually large caches. Unknown caches over 1 GB are never preselected. Some apps keep real downloads there, such as offline files.
  • Protected places. macOS system folders, Keychains, iCloud Drive, Mail and Messages are blocked by the safety check, whatever is selected.

How to clear cache on a Mac with Roomy

  1. Open Roomy

    The scan starts by itself. There’s no account to create. For sandboxed apps’ caches, you can give Full Disk Access; it’s optional.

  2. Click System Junk

    Items are grouped into Browser Caches, App Caches, Logs, Crash Reports, Temporary Files and Saved App State, biggest first.

  3. Check any row

    Click ⓘ to see the exact location, size, number of files and whether it is deleted or moved to the Trash.

  4. Choose what goes

    Click Select Safe Only, or tick items yourself. Right-click a row and choose Never Clean This to exclude it for good.

  5. Confirm

    Click Clean Selected… The confirmation lists every item. Each path is checked again right before it is removed.

What is System Data on a Mac?

Open System Settings → General → Storage and you’ll see a bar split into Applications, Documents, Photos and so on, plus a grey segment called System Data. On many Macs it is tens of gigabytes, and macOS doesn’t say what is inside.

System Data is the bucket for everything without its own category. On a typical Mac that includes app and browser caches, log files, crash reports, temporary files, developer data such as Xcode DerivedData and simulators, package manager caches, iPhone and iPad backups, and local Time Machine snapshots. Some of it is macOS itself and has to stay.

How to clear System Data on a Mac safely

The safe parts to clear are the ones that rebuild themselves: caches, logs and temporary files. That is exactly what System Junk preselects. For the rest:

  • Developer cleanup handles Xcode DerivedData, simulator caches and package manager caches.
  • The User Files category lists old downloads, installers and device backups, never preselected.
  • Optimize can ask macOS to thin local Time Machine snapshots.

After a clean, the Storage bar can take a few minutes to update while macOS recalculates. Caches will grow back as you use your apps; that is normal and a sign they are doing their job.

System Junk questions

Is it safe to delete cache files on a Mac?

Caches are copies of data an app can download or rebuild, so removing them doesn’t lose anything you made. The app rebuilds what it needs the next time it runs, which can make that first launch a little slower. Roomy only preselects caches it rates Safe, and leaves caches of open apps for you to review.

Will clearing my browser cache log me out of websites?

No. Roomy removes only the browser’s cache folder: cached pages, images and scripts. Cookies, logins, bookmarks, passwords, history and open tabs are stored in the browser profile, which isn’t touched.

What is System Data on a Mac?

System Data is the category macOS uses for everything that isn’t an app, a document, a photo or another named type. It usually includes caches, logs, temporary files, developer data and local Time Machine snapshots. Some of it is macOS itself and should stay; the rebuildable parts are what System Junk cleans.

Why do caches come back after cleaning?

Because apps use them. Clearing caches is most useful when a cache has grown very large, when an app misbehaves because of stale data, or when you need space now. It isn’t a speed trick, and we don’t present it as one.

Why are some items marked Review instead of Safe?

Review means “usually fine, take a look first”. It is used for caches of apps that are open, macOS caches, unknown caches over 1 GB, saved window state and shared items in /Library. They are never selected automatically.

Are caches deleted or moved to the Trash?

Caches and logs are deleted right away because they rebuild automatically, so moving them to the Trash wouldn’t free any space. If you prefer, turn on “Move everything to the Trash instead of deleting” in Settings.

From the help center

See your system junk.
The scan is free.

Download Roomy, see exactly what is taking up space, and clean up to 500 MB for free. Nothing is removed until you say so.

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Version 1.0.0 5 MB macOS 14 Sonoma or later Apple silicon and Intel