Rensa
Mac›Disk cleanerCompletely free

See where your space went

Rensa measures your disk, explains what is using it and helps you free space without breaking anything. No subscription, no account, nothing leaves your Mac.

Coming soon to the Mac App Store See how it works

macOS 26 or later · Free, with every feature · No ads

Rensa's overview: a bar showing what uses the disk, and what can be freed grouped into developer junk, caches, old installers and logs.

What it does

Every gigabyte, explained

macOS shows a grey bar called System Data. Rensa shows what is actually in it, what is safe to remove and what isn't.

Space map

A sunburst or treemap of your whole disk. Click into any folder to see what fills it.

Can be freed

Caches, logs, old installers and developer junk, grouped and sized. Only what rebuilds itself is suggested.

Developer cleanup

Xcode DerivedData, old device support, simulator caches, npm and Gradle caches, and node_modules in projects you've left.

Cloud files

Free the local copies of iCloud Drive, OneDrive and Dropbox files. They stay in the cloud and download again when you open them.

Apps and leftovers

Every app with the data it keeps. Uninstall properly, or find what removed apps left behind.

Duplicates

Files with exactly the same content, compared byte for byte. The oldest copy is always kept.

What grew

Rensa keeps a tiny summary after every scan, so next week you can see which folders suddenly grew.

Plain explanations

Every file says what it is and who uses it, like "Hugging Face model" or "Build output in a project", before you decide.

Space map

Find the folder that ate your disk

Rensa reads the names and sizes of millions of files in a minute or two, counts hard links once and never downloads cloud-only files to measure them. Click a ring to zoom in, and see what each item is in the inspector.

The space map: a colourful sunburst of folders, with a list of the largest items beside it.

Safety

Built so nothing breaks

A cleaner is only useful if you can trust it. Every removal passes a safety check right before it happens.

  • Everything goes to the TrashNothing is deleted. Put anything back from Recently Removed with one click.
  • Never system filesmacOS, other users' files, your Photos library and app-managed data like Mail are always left alone.
  • Whole things onlyA piece of an app, an AI model or a git repository can't be removed on its own, so nothing is left half-broken.
  • Cloud files are freed, not deletedMoving a cloud file to the Trash would delete it everywhere. Rensa only removes the local copy.
  • Checked again before removalIf a file changed after the scan, Rensa keeps it and asks you to scan again.
A cleanup list where each file has labels for what it is, who uses it and whether it is safe to remove.

Price

Completely free. Really.

Every feature, for everyone. No subscription, no in-app purchases, no ads and no account. Rensa has no network code at all, so nothing about your files can leave your Mac.

No subscriptionNo trackingNo accountMade in Sweden