Best Disk Analyzer for Mac (2026): DaisyDisk vs Storage Peek vs Free
“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| Disk Inventory X | Rectangular treemap | ~15 sec | Free | Free, reliable | Outdated UI (not updated since 2013) |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)
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)
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)
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
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)
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
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 -aBrowser 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:
- Download Storage Peek ($2.99) →
- Try DaisyDisk ($9.99, free trial) →
- Download Disk Inventory X (Free) →
- Download OmniDiskSweeper (Free) →
- Download GrandPerspective (Free) →
Related guides:
- What’s Taking Up Space on My Mac?
- Mac Storage Management Guide
- Storage Peek vs DaisyDisk: Detailed Comparison
Want instant storage analysis? Download Storage Peek ($2.99) →