Disk Bloom

A free, native macOS disk space visualizer — see where your space went, then clean it up safely.

Disk Bloom is a free alternative to DaisyDisk, GrandPerspective, Disk Inventory X and OmniDiskSweeper, and to cross-platform tools like SquirrelDisk, WinDirStat and WizTree.

Pick a volume or folder, get a fast concurrent scan, then explore an interactive sunburst: hover for size and percentage, click a segment to zoom in (with animated transitions), click the center to go back up, press space to Quick Look a file, and right-click to reveal in Finder, collect for batch deletion, or move to Trash. It never hard-deletes anything.

Features

• Sunburst chart with animated zoom, hover details and breadcrumbs
• Scanner counts what's actually on disk: hardlinked files count once (du semantics), firmlinked directories aren't double-counted, symlinks are never followed, scans stay on one volume — a whole-disk total matches df
• Fast: bulk directory enumeration (getattrlistbulk) with parallel traversal, faster than du on the same tree
• Search the scanned tree, largest results first
• Collector: stage files and folders from anywhere, review the total, move everything to Trash in one step
• Quick Look previews before you delete
• Purgeable space shown per volume
• Multiple windows (⌘N), each with an independent scan
• Administrator scan for folders your user can't read, and guided Full Disk Access setup for protected user data

Requirements

macOS 14 or later. Building needs Xcode and xcodegen.

Build

xcodegen
xcodebuild -project Bloom.xcodeproj -scheme Bloom -configuration Release build

The app lands in build/ (or your derived data path) as Disk Bloom.app. Engine tests: cd Packages/BloomCore && swift test.

Privileged scanning

• "Scan as administrator" runs scans as root. Enable the background helper in the app's Settings (a one-time approval under System Settings → Login Items) and admin scans run through an SMAppService daemon over XPC with no password prompts; the daemon only accepts connections from binaries signed by the same team. Without the helper, the app falls back to a password prompt per scan.
• For everyday scans, grant the app Full Disk Access (System Settings → Privacy & Security). That's what stops macOS's per-folder permission pop-ups; the welcome screen offers it when not granted.

Debug flags

Useful for testing and screenshots:

• --autoscan <dir> — skip the welcome screen and scan a path
• --autofocus <child> / --autotrash <child> / --autocollect <child> / --autosearch <query> — drive the UI
• --report <path> — write the scanned tree as text and exit
• --snapshot <dir> --out <png> — render a chart offscreen to PNG
• --icon <png> — render the app icon artwork