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System Data explainerPaste one Terminal command’s output, get every folder explained.

Explains every part of your Mac’s storage in plain English and cleans only what’s safe. Everything goes to the Trash first.

Works offline. Nothing about your files leaves your Mac.

Storage library

What is System Data?
Time Machine local snapshots
Old iPhone backups on Mac
Is it safe to delete ~/Library/Caches on Mac?
Xcode DerivedData
Ollama and LM Studio models
Can I delete .dmg files after installing on Mac?
All topics →

Guides

How to clear System Data on macOS 27
Turn off Apple Intelligence on macOS 27
Purgeable space on Mac
Check disk space on Mac in Terminal
How to find large files on a Mac
Not enough space to update macOS? Free it fast
Free System Data explainer

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vs CleanMyMac
vs DaisyDisk
vs OmniDiskSweeper
vs macOS Storage settings
What’s this folder?
Glossary

Made for

Developers
256 GB MacBook owners
Privacy-minded Mac users
People who fix a family member’s Mac
People using AI agents
Students

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