The Best Disk Space Analyzers in 2026
We researched disk space analyzers from official websites, including pricing pages, plan tables and product documentation. Rankings reflect each product’s core storage-analysis job, value for money and verified features for inspecting local files, folders and applications.
Our top picks
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Top ranked
TreeSize#1 of 1049.3/10A broad Windows analyzer with strong free features and tiered automation tools.
Free plan · 14-day trial
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Runner-up
WinDirStat#2 of 1049.1/10A classic Windows analyzer with treemaps, file breakdowns, duplicate detection, and CSV export.
Free plan
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Top-ranked free plan
Filelight#3 of 1049.0/10A free, open-source disk analyzer with strong KDE integrations and ring-based visuals.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 104 tools, best first · page 1 of 3
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Best forWindows power users and administrators
A broad Windows analyzer with strong free features and tiered automation tools.
- External drive scans
- File-type breakdown
- Exportable reports
Free plan · 14-day trial Our TreeSize verdict → Visit TreeSizeFor vendors Sponsor this spot · #1 · $149/mo →9.3/10★★★★★Visit TreeSize -
Best forClassic free Windows disk analysis
A classic Windows analyzer with treemaps, file breakdowns, duplicate detection, and CSV export.
- File-type breakdown
- Exportable reports
- Treemap view
9.1/10★★★★★Visit WinDirStat -
Best forKDE users on Linux or Windows
A free, open-source disk analyzer with strong KDE integrations and ring-based visuals.
- External drive scans
- Treemap view
9.0/10★★★★☆Visit Filelight -
Best forFast, simple Windows space analysis
A focused Windows analyzer with treemaps, duplicate detection, and broad device scanning.
- External drive scans
- File-type breakdown
- Exportable reports
8.9/10★★★★☆Visit WizTree -
Best forEnterprise Windows storage reporting
A mature Windows tool for recurring storage analysis, reporting, duplicates, and permissions.
- External drive scans
- File-type breakdown
- Exportable reports
8.8/10★★★★☆Visit SpaceObServer -
Best forPaid Windows treemap cleanup
A paid Windows analyzer for visual storage mapping and targeted cleanup.
- File-type breakdown
- Treemap view
8.7/10★★★★☆Visit SpaceMonger -
Best forSimple free Mac large-file finding
A free Mac utility for finding large files and folders without extra reporting layers.
8.5/10★★★★☆Try OmniDiskSweeper -
Best forStraightforward free Linux desktop analysis
A free, open-source Linux analyzer for visual folder and filesystem usage.
- External drive scans
- Treemap view
8.3/10★★★★☆Visit site -
Best forWindows reporting and scheduled analysis
A detailed Windows analyzer with scheduled reporting, visualizations, and one-time pricing.
- File-type breakdown
- Exportable reports
- Treemap view
7.9/10★★★★☆Visit FolderSizes -
Best forEnterprise Windows storage reporting
A Windows-focused analyzer for detailed storage reporting, classification, and automation.
- File-type breakdown
- Exportable reports
7.8/10★★★★☆Visit DiskSavvy -
Best forUsers scanning local, network, USB, or removable drives
A desktop disk analyzer with detailed file reports, cleanup tools, and drive scanning.
- External drive scans
- File-type breakdown
- Exportable reports
7.7/10★★★★☆Visit site -
Best forWindows teams needing storage trends
A capable Windows analyzer with strong history tools, but Professional is a paid upgrade.
- Application sizes
- External drive scans
- File-type breakdown
7.6/10★★★★☆Visit SizeTrend -
Best forCross-platform open-source users
A broad, open-source storage analyzer for users who want visual scans and cleanup tools.
- External drive scans
- File-type breakdown
- Exportable reports
7.5/10★★★★☆Visit eDirStat -
Best forFree users needing rich Windows analysis
A feature-rich free analyzer for visualizing, comparing, and monitoring Windows storage.
- Exportable reports
- Treemap view
7.4/10★★★★☆Visit Disk Auditor -
Best forWindows users needing free reports and snapshots
A free, open-source Windows analyzer with detailed visual reports and scan comparisons.
- File-type breakdown
- Exportable reports
- Treemap view
7.3/10★★★★☆Visit Capacitra -
Best forMac users wanting cleanup-focused analysis
A Mac-focused analyzer with deep visibility and confirmation-first cleanup controls.
- Application sizes
- File-type breakdown
- Exportable reports
7.2/10★★★★☆Visit StorageRadar -
Best forFree cross-platform desktop analysis
A capable free analyzer for Linux and macOS users who need visual storage insight.
- Application sizes
- File-type breakdown
- Treemap view
7.1/10★★★★☆Visit QDirStat -
Best forMac users wanting free duplicate analysis
A free Mac analyzer for visual storage breakdowns, duplicates, large files, and scan changes.
- External drive scans
- File-type breakdown
- Exportable reports
7.0/10★★★★☆Visit Flare Scan -
Best forOpen-source Mac users wanting scan history
A free, open-source Mac analyzer with scan history and detailed storage views.
- Application sizes
- File-type breakdown
- Treemap view
6.9/10★★★☆☆Visit Neodisk -
Best forWindows users wanting filesystem-level detail
A free Windows analyzer for detailed filesystem scans, visual reports, duplicates, and cleanup.
- File-type breakdown
- Treemap view
6.8/10★★★☆☆Visit DiskMap -
Best forCross-platform users exploring files and installed apps
A local, open-source analyzer with treemaps, filters, and Windows app sizing.
- Application sizes
- File-type breakdown
- Treemap view
6.7/10★★★☆☆Visit DiskScope -
Best forCross-platform users wanting a simple treemap
A free, open-source disk analyzer with clear visual breakdowns across three desktop platforms.
- File-type breakdown
- Treemap view
6.6/10★★★☆☆Visit Drive Sonar -
Best forPortable free Windows treemap analysis
A free, portable Windows treemap analyzer for finding large files and folders.
- File-type breakdown
- Exportable reports
- Treemap view
6.5/10★★★☆☆Visit SpaceSniffer -
Best forTechnical users needing remote terminal workflows
A focused open-source choice for remote, terminal-based disk analysis and cleanup.
- Exportable reports
- Treemap view
6.4/10★★★☆☆Visit ccdu -
Best forUsers cataloging and comparing files across drives
A focused desktop catalog for comparing, searching, and checking files across drives.
- External drive scans
- Treemap view
6.3/10★★★☆☆Visit Drive Atlas -
Best forPrivacy-focused Mac storage analysis
A focused, open-source Mac analyzer for visual storage review and cleanup planning.
- External drive scans
- Exportable reports
- Treemap view
6.2/10★★★☆☆Visit Radix -
Best forMac users wanting guided cleanup
A free Mac cleanup tool with visual storage maps, duplicate detection, and staged deletion.
- External drive scans
- File-type breakdown
- Treemap view
6.1/10★★★☆☆Visit Spacie -
Best forPolished Mac cloud and disk mapping
A polished Mac disk mapper with cloud scans and a $9.99 lifetime license.
- External drive scans
- Treemap view
6.0/10★★★☆☆Visit DaisyDisk -
Best forMac users wanting low-cost cleanup assistance
A low-cost Mac analyzer with visual storage mapping and focused cleanup features.
- Application sizes
- Treemap view
5.9/10★★★☆☆Visit DiskAtlas -
Best forMac users wanting open-source APFS-aware analysis
A focused, open-source Mac analyzer with strong APFS-aware visualization.
- File-type breakdown
- Treemap view
5.8/10★★★☆☆Visit AppleTree -
Best forUsers needing affordable Mac and Windows coverage
Affordable cross-platform disk mapping with useful cleanup and cloud-drive analysis.
- External drive scans
- Treemap view
5.7/10★★★☆☆Visit LumaDisk -
Best forFree macOS and Windows visual analysis
A free macOS and Windows analyzer for visual storage breakdowns and file cleanup.
- Application sizes
- File-type breakdown
- Exportable reports
5.6/10★★★☆☆Visit DiskLens -
Best forUsers wanting a free treemap on major desktop OSes
A visual disk analyzer with a proportional treemap, scan controls, and cleanup actions.
- Treemap view
5.5/10★★★☆☆Visit SpaceBrowser -
Best forCross-platform users wanting a lightweight treemap
An open-source desktop tool for exploring directory sizes in a color-coded treemap.
- File-type breakdown
- Exportable reports
- Treemap view
5.4/10★★★☆☆Visit dumap -
Best forCross-platform users wanting a minimal treemap tool
A focused, open-source treemap analyzer with live scanning across three operating systems.
- Treemap view
5.3/10★★★☆☆Visit SpaceMan -
Best forWindows users scanning shared storage
A Windows-focused analyzer with broad scan coverage, charts, exports, and automation.
- External drive scans
- Exportable reports
5.2/10★★★☆☆Visit Folder Size -
Best forCross-platform users scanning remote filesystems
A cross-platform analyzer with unusually capable remote filesystem scanning.
- External drive scans
5.1/10★★★☆☆Visit Space Wizard -
Best forMac users reviewing app and developer storage
A Mac disk analyzer with file-type categories and app-focused browsing on its paid tier.
- Application sizes
- File-type breakdown
5.0/10★★☆☆☆Visit OverClean -
Best forMac users needing cleanup beyond analysis
A focused Mac cleanup utility with broad scanning and a $29 one-time entry price.
- External drive scans
- File-type breakdown
4.9/10★★☆☆☆Visit Disk Xray -
Best forFast cross-platform treemap scanning
A focused, free analyzer for quickly finding large directories and files.
- File-type breakdown
- Treemap view
4.8/10★★☆☆☆Visit rsdirstat -
Best forMac users wanting broad cleanup and drive scanning
A one-time-purchase Mac analyzer with broad scan views and cleanup review tools.
- Application sizes
- External drive scans
- File-type breakdown
4.7/10★★☆☆☆Visit SpareDisk -
Best forMac users wanting a simple free treemap
A focused, free Mac treemap analyzer for finding large folders and files.
- External drive scans
- Exportable reports
- Treemap view
4.6/10★★☆☆☆Visit SpaceMap -
Best forCross-platform users wanting visual, read-only scans
A free, open-source directory scanner for visualizing storage use across Windows, macOS, and Linux.
- Exportable reports
- Treemap view
4.5/10★★☆☆☆Visit duvis -
Best forMac users wanting open-source cleanup review
A focused, free Mac utility for locating large files and reviewing cleanup candidates.
- External drive scans
- File-type breakdown
4.4/10★★☆☆☆Visit StorageScope -
Best forOpen-source users wanting cleanup features
A cross-platform analyzer with strong visualization, duplicate finding, and cleanup tools.
- Treemap view
4.3/10★★☆☆☆Visit DiskPilot -
Best forFree users wanting cross-platform scan snapshots
A free, open-source filesystem analyzer for comparing scans across Windows, macOS, and Linux.
- Exportable reports
4.2/10★★☆☆☆Visit RaDisk -
Best forWindows users who want AI-assisted cleanup suggestions
A Windows analyzer that pairs visual disk scans with AI directory analysis and cleanup.
- Exportable reports
4.1/10★★☆☆☆Visit DiskBrain -
Best forFree terminal or browser analysis everywhere
A free, open-source analyzer for detailed local storage inspection across five platforms.
- External drive scans
- Exportable reports
- Treemap view
4.0/10★★☆☆☆Visit gdu -
Best forMac users wanting a free open-source disk map
A free macOS disk analyzer with a treemap, folder tree, and file-type breakdown.
- File-type breakdown
- Treemap view
3.9/10★★☆☆☆Try MacStorageAtlas -
Best forMac users wanting fast free storage scans
A fast local Mac scanner with live visual analysis and one-click cleanup.
- External drive scans
3.8/10★★☆☆☆Visit OpenDisk
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Desktop platforms | Treemap view | File-type breakdown | Score |
|---|---|---|---|---|---|---|---|
| 1 | TreeSize | Yes | Windows | Yes | Yes | 9.3 | |
| 2 | WinDirStat | Yes | Free | Windows | Yes | Yes | 9.1 |
| 3 | Filelight | Yes | Free | Linux, Windows | Yes | 9.0 | |
| 4 | WizTree | Yes | Windows, macOS | Yes | Yes | 8.9 | |
| 5 | SpaceObServer | No | windows | Yes | Yes | 8.8 | |
| 6 | SpaceMonger | Windows | Yes | Yes | 8.7 | ||
| 7 | OmniDiskSweeper | Yes | Free | macos | 8.5 | ||
| 8 | Disk Usage Analyzer | Yes | Free | Linux | Yes | No | 8.3 |
| 9 | FolderSizes | Yes | $30 one-time | Windows | Yes | Yes | 7.9 |
| 10 | DiskSavvy | Windows | Yes | 7.8 | |||
| 11 | Disk Analyzer Pro | Yes | windows, macos | Yes | 7.7 | ||
| 12 | SizeTrend | Yes | $69.99 one-time | windows | Yes | 7.6 | |
| 13 | eDirStat | Yes | Free | windows, macos, linux | Yes | Yes | 7.5 |
| 14 | Disk Auditor | Yes | Free | Windows | Yes | 7.4 | |
| 15 | Capacitra | Yes | Free | windows | Yes | Yes | 7.3 |
| 16 | StorageRadar | Yes | $9.99 one-time | macos | Yes | Yes | 7.2 |
| 17 | QDirStat | Yes | Free | Linux, BSD, Unix-like systems; macOS | Yes | Yes | 7.1 |
| 18 | Flare Scan | Yes | Free | macos | Yes | Yes | 7.0 |
| 19 | Neodisk | Yes | Free | macOS | Yes | Yes | 6.9 |
| 20 | DiskMap | Yes | Free | windows | Yes | Yes | 6.8 |
| 21 | DiskScope | Yes | Free | windows, macos, linux | Yes | Yes | 6.7 |
| 22 | Drive Sonar | Free | windows, macos, linux | Yes | Yes | 6.6 | |
| 23 | SpaceSniffer | Yes | Free | windows | Yes | Yes | 6.5 |
| 24 | ccdu | Yes | Free | linux, macos | Yes | 6.4 | |
| 25 | Drive Atlas | Yes | $20 one-time | windows, linux | Yes | 6.3 | |
| 26 | Radix | Yes | Free | macos | Yes | 6.2 | |
| 27 | Spacie | Yes | Free | macos | Yes | Yes | 6.1 |
| 28 | DaisyDisk | No | $9.99 one-time | macos | Yes | 6.0 | |
| 29 | DiskAtlas | Yes | $5 one-time | macos | Yes | 5.9 | |
| 30 | AppleTree | Yes | macos | Yes | Yes | 5.8 | |
| 31 | LumaDisk | Yes | $6.89 one-time | macOS, Windows | Yes | 5.7 | |
| 32 | DiskLens | Yes | Free | macOS, Windows | No | Yes | 5.6 |
| 33 | SpaceBrowser | Yes | Free | Windows, Linux, macOS | Yes | 5.5 | |
| 34 | dumap | Free | windows, macos, linux | Yes | Yes | 5.4 | |
| 35 | SpaceMan | Free | windows, macos, linux | Yes | 5.3 | ||
| 36 | Folder Size | Yes | $24.95 one-time | windows | 5.2 | ||
| 37 | Space Wizard | Yes | Windows, macOS, Linux | No | No | 5.1 | |
| 38 | OverClean | Yes | $9.99 one-time | macos | Yes | 5.0 | |
| 39 | Disk Xray | $29/user one-time | macos | Yes | 4.9 | ||
| 40 | rsdirstat | Yes | Free | macos, linux, windows | Yes | Yes | 4.8 |
| 41 | SpareDisk | No | $4.99 one-time | macos | Yes | Yes | 4.7 |
| 42 | SpaceMap | Yes | macos | Yes | No | 4.6 | |
| 43 | duvis | Yes | Free | windows, macos, linux | Yes | 4.5 | |
| 44 | StorageScope | Yes | Free | macos | Yes | 4.4 | |
| 45 | DiskPilot | Yes | Free | windows, macos, linux | Yes | 4.3 | |
| 46 | RaDisk | Yes | Free | windows, macos, linux | 4.2 | ||
| 47 | DiskBrain | Yes | $23.99/yr | windows | 4.1 | ||
| 48 | gdu | Yes | Free | Linux, macOS, Windows | Yes | No | 4.0 |
| 49 | MacStorageAtlas | Yes | Free | macos | Yes | Yes | 3.9 |
| 50 | OpenDisk | Yes | Free | macos | 3.8 |
Head-to-head All 28 comparisons →
- TreeSize vs WinDirStat
- TreeSize vs Filelight
- TreeSize vs WizTree
- TreeSize vs SpaceObServer
- TreeSize vs SpaceMonger
- TreeSize vs OmniDiskSweeper
- TreeSize vs Disk Usage Analyzer
- WinDirStat vs Filelight
- WinDirStat vs WizTree
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How we rank disk space analyzers
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update