Clean up your Mac without buying a cleaner app

The “Mac cleaner” market is huge, expensive, and mostly unnecessary. Almost everything the big subscription apps do, you can do with built-in tools. Here’s the free workflow.

The free toolkit

You already have:

• Finder. For sorting by size, kind, date.
• Storage Settings. System Settings > General > Storage.
• Terminal. For the heavy lifting.
• Activity Monitor. For seeing what’s using disk in real-time.
• Time Machine. For backups.

The workflow

1. Open Storage Settings. Note the size of each category. Find your worst offender.
2. Use the "Documents" review screen. System Settings > General > Storage > Documents > "Review Files." Sort by size. Delete what you don't need.
3. Empty Downloads of obvious junk. Sort Downloads by Kind, bin all DMGs and ZIPs.
4. Manage iOS backups. Finder > iPhone > Manage Backups. Wipe old devices.
5. Clear Mail attachments. Mail > Settings > Accounts > Advanced > "Download Attachments: None."
6. Use Terminal for invisible space. du -sh ~/Library/* 2>/dev/null | sort -h | tail -10
7. Empty the Trash. Right-click Dock icon > Empty Trash. Or set auto-empty after 30 days.

What cleaner apps add that you actually want

To be fair, paid cleaners do a few things that are genuinely useful:

• Duplicate detection. The big one. No built-in macOS tool finds duplicates.
• Bundle uninstall. Some can find and remove leftover app data more thoroughly than dragging to Trash.
• Periodic reminders. A nag to do this monthly.

Of those, only duplicate detection actually requires special software. Bundle uninstall you can do manually (search ~/Library for the app name). Periodic reminders are a calendar entry.

What cleaner apps add that you don’t need

• “Junk file” warnings that flag your real files
• “Memory cleaning” that confuses RAM with disk
• Speed boosters that are usually just clearing caches macOS would have cleared itself
• Antivirus add-ons of questionable value on macOS
• Subscription billing for one-time tasks

A reasonable hybrid

The honest answer is: do everything in this checklist for free, and if you really want a duplicate finder, get one that’s a one-time purchase.

Download Dupe is $14.99 once, no subscription. It does one thing — find byte-identical files via SHA-256 hashing and move them to the Trash — and doesn’t pretend to do anything else. No fake junk warnings, no monthly billing, no memory cleaner nonsense. Doesn’t touch system files or app bundles.

If you’re tempted by a $90/year cleaner subscription, the math is straightforward: Dupe at $14.99 is half the cost of two months of those.