TidyMacWhat’s in your Mac’s System Data? Free explainer
Run one command, paste the result, and see every big folder explained. Runs entirely in your browser.
1. Run this in Terminal
du -sh ~/Library/* ~/Library/Application\ Support/* ~/.[!.]* 2>/dev/null | sort -rh | head -402. Paste the result
Skip the Terminal next time
TidyMac measures all of this (and protected folders) in about 20 seconds, explains each part, and cleans only what’s safe.
Questions
Does this upload my folder list?
No. Everything runs in your browser. Nothing you paste is sent anywhere.
Why does du say “Operation not permitted”?
macOS protects some folders. Give Terminal Full Disk Access in System Settings › Privacy & Security › Full Disk Access, then run the command again.
Is “Safe” a guarantee?
The labels follow TidyMac’s library: Safe means macOS or the app recreates it. Always read the linked explanation, quit the app first, and move things to the Trash rather than deleting them outright.