DaisyDisk vs GrandPerspective vs OmniDiskSweeper

“Your disk is almost full.”

You delete a few files. The warning returns next week. Your 512 GB Mac has 3 GB free. Where did the other 509 GB go?

Built-in macOS Storage Management shows categories (“System Data: 150 GB”), but not which files. You need a disk analyzer to visualize space usage and find what to delete.

Here’s an honest roundup of the best Mac disk space analyzers in 2026: free and paid, fast and polished.

Quick Comparison Table

App	Visualization	Scan Speed (500GB)	Pricing	Best Feature	Limitation
Storage Peek	Rectangular treemap	~10 sec	$2.99	Fastest scanning, menu bar widget	No saved scans
DaisyDisk	Circular sunburst	~20 sec	$9.99	Beautiful design, saved scans	Slower, costs $10
Disk Inventory X	Rectangular treemap	~15 sec	Free	Free, reliable	Outdated UI (not updated since 2013)
OmniDiskSweeper	List view	~25 sec	Free	Simple list, free	No treemap, slower
GrandPerspective	Rectangular treemap	~30 sec	Free	Free, customizable	Slow, clunky navigation

The Apps: Detailed Reviews

1. Storage Peek: Best for Speed + Affordable

What it does:

Scans entire drive in ~10 seconds (multi-threaded, SSD-optimized)
Rectangular treemap (size = rectangle area)
Click to drill down, right-click to delete or reveal in Finder
Menu bar widget (shows storage at a glance)
Color-coded by file type (videos, images, apps, documents)
Admin mode for system folders

Why it’s great:

✅ Fastest scanning (2-3x faster than competitors)
✅ Completely free (no ads, no paid upgrades)
✅ Menu bar widget (monitor storage without opening app)
✅ Instant navigation (no animations, just instant drill-down)
✅ Lightweight (<30 MB RAM)

Limitations:

❌ No saved scans (can’t compare before/after)
❌ No export reports
❌ Minimal design (functional, not polished)

Best for:

Users who want fast analysis at an affordable price
Developers who scan frequently (Xcode cache, npm, Docker)
Anyone who values speed > aesthetics

Pricing: $2.99 (one-time purchase on Mac App Store)

Download Storage Peek →

2. DaisyDisk: Best for Design + Polish

What it does:

Circular sunburst visualization (iconic design)
Smooth zoom animations when navigating
Save scan results (compare storage over time)
Quick Look file preview (press Space)
Delete or “Collect” files (stage for deletion, review, then delete batch)
Export HTML reports
Admin mode for system files

Why it’s great:

✅ Gorgeous design (Apple Design Award winner)
✅ Smooth animations feel premium
✅ Saved scans (see what changed over time)
✅ Quick Look preview (see file contents before deleting)
✅ Active development (regular updates)

Limitations:

❌ Slower scanning (~20 seconds vs. 10 seconds)
❌ Costs $9.99 (competitors are free)
❌ No menu bar widget

Best for:

Users who want the most polished experience
Power users who want saved scans and reports
Users who don’t mind paying $10 for premium UX

Pricing: $9.99 (one-time purchase)

Buy DaisyDisk →

3. Disk Inventory X: Best Free Treemap (Classic)

What it does:

Classic rectangular treemap visualization
Fast scanning (similar to Storage Peek)
Shows file info panel (size, type, path)
Reveal in Finder or delete files

Why it’s great:

✅ Completely free (open source)
✅ Fast scanning (multi-threaded)
✅ Treemap is space-efficient
✅ Reliable (used by thousands since 2005)

Limitations:

❌ Not updated since 2013 (still works on modern macOS, but outdated)
❌ No Dark Mode support
❌ No menu bar widget
❌ Clunky UI (feels like 2010 software)

Best for:

Budget users who want a free treemap tool
Users who don’t care about modern design
Tried-and-true classic (if it ain’t broke, don’t fix it)

Pricing: Free (open source)

Download Disk Inventory X →

4. OmniDiskSweeper: Best Free List View

What it does:

List-based view (folders sorted by size, largest first)
Shows folder hierarchy (expand folders to see contents)
Quick reveal in Finder or delete
No treemap (just a list)

Why it’s great:

✅ Completely free (by Omni Group)
✅ Simple, no-nonsense interface
✅ Fast enough for most users
✅ Reliable and well-maintained

Limitations:

❌ No treemap visualization (list only)
❌ Slower than modern analyzers (~25 seconds)
❌ No menu bar widget
❌ Single-threaded scanning (not optimized for modern Macs)

Best for:

Users who prefer list view over treemaps
Budget users who want a free tool
Quick one-off cleanup (not frequent use)

Pricing: Free

Download OmniDiskSweeper →

5. GrandPerspective: Best Free Open Source Treemap

What it does:

Rectangular treemap visualization
Multiple color schemes (by file type, folder, etc.)
Filter by file size/type
Customizable display

Why it’s great:

✅ Free and open source
✅ Customizable color schemes
✅ Active development (still updated)

Limitations:

❌ Slow scanning (~30 seconds for 500 GB)
❌ Clunky navigation (harder to drill down than DaisyDisk or Storage Peek)
❌ No menu bar widget
❌ Outdated UI (functional but not modern)

Best for:

Open-source advocates
Users who want customizable color schemes
Budget users who want a free treemap tool

Pricing: Free (open source)

Download GrandPerspective →

Feature-by-Feature Comparison

Scanning Speed

Why it matters: When disk is full, you need answers now.

App	500 GB SSD Scan Time	Multi-Threaded	SSD-Optimized
Storage Peek	~10 seconds	✅	✅
Disk Inventory X	~15 seconds	✅	⚠️
DaisyDisk	~20 seconds	⚠️	✅
OmniDiskSweeper	~25 seconds	❌	❌
GrandPerspective	~30 seconds	❌	❌

Winner: Storage Peek (fastest by 2-3x)

Visualization Style

App	Visualization	Pros	Cons
Storage Peek	Rectangular treemap	Space-efficient, instant navigation	No animations
DaisyDisk	Circular sunburst	Beautiful, smooth animations	Wasted space in center
Disk Inventory X	Rectangular treemap	Space-efficient, classic	Outdated look
OmniDiskSweeper	List view	Simple, familiar	No visual hierarchy
GrandPerspective	Rectangular treemap	Customizable colors	Cluttered

Winner: Tie: Treemap (Storage Peek, Disk Inventory X) for efficiency, Sunburst (DaisyDisk) for beauty, List (OmniDiskSweeper) for simplicity

User Experience

App	Navigation Speed	Menu Bar Widget	Delete from App	Quick Look Preview
Storage Peek	Instant	✅	✅	❌
DaisyDisk	Animated (~0.5s)	❌	✅	✅
Disk Inventory X	Instant	❌	✅	❌
OmniDiskSweeper	Instant	❌	✅	❌
GrandPerspective	Slow	❌	❌	❌

Winner: Storage Peek (menu bar widget + instant navigation) / DaisyDisk (Quick Look preview)

Advanced Features

App	Saved Scans	Export Reports	Admin Mode	Color Coding
Storage Peek	❌	❌	✅	✅
DaisyDisk	✅	✅ (HTML)	✅	✅
Disk Inventory X	❌	❌	⚠️	✅
OmniDiskSweeper	❌	❌	✅	❌
GrandPerspective	❌	❌	⚠️	✅

Winner: DaisyDisk (only app with saved scans + export)

Pricing & Value

App	Price	Value Rating	Best For
Storage Peek	$2.99	⭐⭐⭐⭐⭐	Fast + affordable
DaisyDisk	$9.99	⭐⭐⭐⭐	Worth $10 if you value design
Disk Inventory X	Free	⭐⭐⭐⭐	Free + reliable (but outdated)
OmniDiskSweeper	Free	⭐⭐⭐	Free list view
GrandPerspective	Free	⭐⭐⭐	Free open source

Best value: Storage Peek (fastest + $3) / Disk Inventory X (tried-and-true free)

Which App Should You Choose?

Choose Storage Peek if:

✅ You want the fastest scanning (10 seconds vs. 20-30 seconds)
✅ You want instant navigation (no animations, just instant)
✅ You want a menu bar widget (monitor storage without opening app)
✅ You want affordable ($3 vs. $10)
✅ You scan frequently (developers cleaning Xcode, npm, Docker)

Download Storage Peek ($2.99) →

Choose DaisyDisk if:

✅ You want the most polished experience (animations, design, attention to detail)
✅ You want saved scans (compare before/after cleanup)
✅ You want Quick Look preview (see file contents before deleting)
✅ You want export reports (HTML export for documentation)
✅ You don’t mind paying $9.99

Buy DaisyDisk ($9.99) →

Choose Disk Inventory X if:

✅ You want free treemap (no cost)
✅ You don’t care about modern design (it works, who cares how it looks)
✅ You want reliable and fast (proven since 2005)
✅ You don’t need Dark Mode or menu bar widgets

Download Disk Inventory X (Free) →

Choose OmniDiskSweeper if:

✅ You prefer list view over treemaps
✅ You want free and simple
✅ You do cleanup once in a while (not frequently)
✅ You trust Omni Group (reputable Mac developer)

Download OmniDiskSweeper (Free) →

Choose GrandPerspective if:

✅ You want open source (inspect code, trust transparency)
✅ You want customizable color schemes
✅ You want free treemap and don’t mind slow scanning
✅ You’re an open-source advocate

Download GrandPerspective (Free) →

My Honest Recommendation

For most users:

Start with Storage Peek ($3): Fastest, menu bar widget, affordable
If you want polish: Upgrade to DaisyDisk ($10): Beautiful design, saved scans

For developers:

Use Storage Peek: Fastest scanning = better workflow when cleaning Xcode, npm, Docker frequently

For budget users:

Storage Peek ($3) or Disk Inventory X (free): Both work well, Storage Peek is faster

For power users:

Use both: Storage Peek for quick daily checks (menu bar widget), DaisyDisk for thorough cleanup (saved scans)

Avoid “Mac Cleaner” Scams

Apps to avoid:

CleanMyMac X ($30-90/year subscription): Overpriced, does what free disk analyzers + manual cleanup do
MacKeeper: Historically scammy, aggressive pop-ups
CCleaner for Mac: Desktop version is fine, but subscription is overpriced

Why avoid?

Expensive subscriptions ($30-90/year)
Overpromise (“Clean 50 GB with one click!”)
Do what you can do manually (clear caches, delete large files)
Some are borderline malware (aggressive upselling)

Better approach:

Use free disk analyzer (Storage Peek, Disk Inventory X)
Manually delete caches/large files (see cleanup guide below)
Use AppCleaner (free) to fully uninstall apps

Quick Cleanup Guide

Once you’ve found what’s using space, here’s what to delete safely:

Developer Files (20-100 GB)

# Xcode Derived Data
rm -rf ~/Library/Developer/Xcode/DerivedData

# npm/yarn cache
npm cache clean --force
yarn cache clean

# Homebrew cache
brew cleanup

# Docker images
docker system prune -a

Browser Caches (5-20 GB)

Safari: Develop → Empty Caches
Chrome: Settings → Clear browsing data → Cached images/files
Firefox: Preferences → Clear Data

Application Caches (10-50 GB)

# Spotify
rm -rf ~/Library/Caches/com.spotify.client

# Slack
rm -rf ~/Library/Application\ Support/Slack/Cache

# All caches (nuclear option)
rm -rf ~/Library/Caches/*

iOS Backups (10-100 GB)

# Location:
~/Library/Application Support/MobileSync/Backup/

# Delete old backups (keep most recent)

Time Machine Snapshots (10-50 GB)

# List snapshots
tmutil listlocalsnapshots /

# Delete specific snapshot
tmutil deletelocalsnapshots [date]

Downloads Folder (5-50 GB)

Sort by size (Cmd + J → Arrange by Size)
Delete old installers (.dmg files)
Delete archives (.zip files after extracting)

FAQ

Is DaisyDisk worth $10?

Depends on priorities.

You’re paying for:

Beautiful design + smooth animations
Saved scans (compare before/after)
Quick Look preview
Export reports

Worth it if: You value design quality and use disk analyzer regularly.

Not worth it if: You just need to find large files once in a while (Storage Peek at $3 does this).

Why is Storage Peek faster than DaisyDisk?

Technical reasons:

Multi-threaded scanning: Storage Peek uses all CPU cores (8-12 threads). DaisyDisk uses fewer threads to avoid UI jank during animations.
No animations during scan: Storage Peek shows a progress bar. DaisyDisk renders sunburst while scanning (adds overhead).
SSD-optimized: Storage Peek uses parallel directory traversal (fast on SSDs). DaisyDisk uses sequential traversal (safer but slower).

Trade-off: DaisyDisk prioritizes smooth animations over scan speed.

Can I trust these apps to delete files safely?

Yes, they use macOS Trash.

Select file → “Move to Trash” or “Delete”
File moves to Trash (not permanently deleted)
You can restore from Trash if you deleted wrong file
Empty Trash manually when ready

Safety tip: Don’t blindly delete large files in /System/ or /Library/. Check what they are first.

What is “System Data” and why is it huge?

System Data (formerly “Other”) includes:

macOS system files and caches
iOS device backups (~/Library/Application Support/MobileSync/Backup/)
Time Machine local snapshots
Spotlight index
App caches (browser, Slack, Spotify, etc.)

Normal size: 20-50 GB Bloated size: 100-200+ GB (indicates old backups or excessive caches)

Solution: Use disk analyzer to drill down into System Data and identify specific files.

Do these apps work on external drives?

Yes, all of them.

How to scan external drive:

Storage Peek: Click “Choose Folder” → Select external drive
DaisyDisk: Click drive icon → Select external drive
Disk Inventory X: File → Open Volume → Select external drive

Can I use these apps to find duplicate files?

No, these are disk space analyzers, not duplicate finders.

For duplicates, use:

Gemini 2 (paid, $19.95): Best duplicate finder
dupeGuru (free, open source): Free alternative
fdupes (Terminal: brew install fdupes)

Conclusion

Best disk space analyzer for Mac depends on your priorities:

Priority	Winner
Fastest scanning	Storage Peek (10 sec)
Best design	DaisyDisk (Apple Design Award)
Menu bar widget	Storage Peek (unique feature)
Saved scans	DaisyDisk (unique feature)
Affordable + fast	Storage Peek ($3)
Free + reliable	Disk Inventory X (classic)
List view	OmniDiskSweeper
Open source	GrandPerspective

My recommendation:

Affordable + fast: Storage Peek ($3)
Polished + worth $10: DaisyDisk
Use both: Storage Peek for daily checks, DaisyDisk for deep cleanup

Try them all and pick what fits your workflow:

Related guides:

Want instant storage analysis? Download Storage Peek ($2.99) →