How to Check Mac Storage and Free Space
Smart fan control, thermal monitoring, storage scanner, and junk cleaner. One native macOS app. No subscription.
The 'About This Mac' storage view lies to you
Well, not lies exactly. But it groups everything into vague categories like "System Data" and "Other" that tell you nothing useful. I had 120GB of "System Data" once. What was it? Old Time Machine snapshots, iOS device backups, and Xcode simulators. You'd never know that from Apple's built-in tool. DaisyDisk shows you a sunburst chart which looks pretty but costs $10 and only does storage. BreezeKit gives you the same information plus 11 other tools.
Where your storage actually goes
On a developer's Mac: ~/Library/Developer (Xcode stuff) is usually 20-60GB. node_modules scattered across projects: 5-20GB. Docker images: 10-40GB. On a regular user's Mac: Photos library, iMovie projects, and Downloads folder are the usual suspects. BreezeKit's Storage section scans your entire disk and shows top-level folders sorted by size, with percentage bars. Takes about 30 seconds for a 500GB SSD.
The biggest files you forgot about
BreezeKit also finds your biggest individual files — that 8GB screen recording from last month, the .dmg installer you never deleted, the zip file you downloaded and extracted but kept both copies. It categorizes files by type: videos, archives, disk images, documents, developer files. You can filter by category and sort by size. I found a 14GB Parallels VM backup I completely forgot existed.
Actually freeing the space
Once you identify what's eating your disk, BreezeKit lets you open any file or folder in Finder with one click. It won't auto-delete your files — that's too dangerous for a storage scanner. But it shows you exactly what to delete and how much you'll recover. Combined with the Clean section (which handles caches and junk automatically), you can typically recover 20-50GB on a Mac that's been used for a year or more.
BreezeKit — Your Mac, running cooler
Monitor every sensor, control your fans, clean junk, and track battery health. One app. No subscription.
Download Free — $10 one-time