macOS Settings → General → Storage shows "System Data" as a grey blob. For AI-tool users, that blob is usually:

1. Model caches — ~/.cache/huggingface, ~/.ollama, ~/.cache/lm-studio (see each guide)
2. Editor caches — Cursor / VS Code Application Support dirs
3. Agent transcripts — ~/.claude/projects
4. npm spill — ~/.npm/_npx, pip cache
5. Docker.raw sparse file (Docker Desktop)
6. Xcode-ish leftovers if you build native stuff: ~/Library/Developer/CoreSimulator, DerivedData

Measure like a pro

sudo du -xsh ~/* 2>/dev/null | sort -h | tail -15
du -sh ~/.cache/* 2>/dev/null | sort -h

One-click alternatives

Don't want to touch the terminal? These do it safely (paid):

Sponsored links. We only list tools we'd run ourselves.

FAQ