Best Disk Space Analyzers in 2026
Finding what uses disk space starts with inspecting folders, files, and drives in a way that suits your system. Compared on application sizes, desktop platforms, exportable reports, external drive scans, file-type breakdown, free plan, paid from, scan scope, and treemap view, these tools offer several angles for reviewing storage. TreeSize and FolderSizes head the ranking, followed by WizTree, with QDirStat and gdu also near the top. Check whether external drives are in scope, how file types are summarized, and whether a treemap or exportable report fits the way you investigate space use.
84 disk space analyzers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Desktop platforms | |
|---|---|---|---|---|---|---|---|---|
| 1 |  TreeSize | 7.5 | RecognisedAPIDocumented | Free | Yes | Free | Windows | View |
| 2 | FolderSizes | 7.5 | RecognisedAPIDocumented | Free | Yes | $30one-time | Windows | View |
| 3 | WizTree | 7.5 | RecognisedAPIDocumented | $25/mo | Yes | $25one-time | Windows, macOS | View |
| 4 |  SizeTrend | 7.2 | RecognisedAPIDocumented | Free | Yes | $69.99one-time | windows | View |
| 5 |  QDirStat | 7.1 | RecognisedAPIDocumented | Free | Yes | — | Linux, BSD, Unix-like systems; macOS | View |
| 6 |  gdu | 7.1 | RecognisedAPIDocumented | Free | Yes | — | Linux, macOS, Windows | View |
| 7 |  StorageRadar | 7.1 | RecognisedAPIDocumented | $9.99/mo | Yes | $9.99one-time | macos | View |
| 8 |  Folder Size | 7.1 | RecognisedAPIDocumented | $24.95/mo | Yes | $24.95one-time | windows | View |
| 9 | Capacitra | 7.0 | RecognisedAPIDocumented | Free | Yes | — | windows | View |
| 10 | Disk Auditor | 7.0 | RecognisedAPIDocumented | Free | Yes | — | Windows | View |
| 11 |  Flare Scan | 7.0 | RecognisedAPIDocumented | Free | Yes | — | macos | View |
| 12 | eDirStat | 7.0 | RecognisedAPIDocumented | Free | Yes | — | windows, macos, linux | View |
| 13 |  Spacie | 6.9 | RecognisedAPIDocumented | Free | Yes | — | macos | View |
| 14 | DiskAtlas | 6.9 | RecognisedAPIDocumented | $5/mo | Yes | $5one-time | macos | View |
| 15 |  DiskMap | 6.8 | RecognisedAPIDocumented | Free | Yes | — | windows | View |
| 16 |  LumaDisk | 6.8 | RecognisedAPIDocumented | $6.89/mo | Yes | $6.89one-time | macOS, Windows | View |
| 17 |  Space Wizard | 6.8 | RecognisedAPIDocumented | Free | Yes | — | Windows, macOS, Linux | View |
| 18 |  SpaceObServer | 6.7 | RecognisedAPIDocumented | — | No | — | windows | View |
| 19 |  TreeLens | 6.7 | RecognisedAPIDocumented | Free | Yes | — | windows | View |
| 20 |  SpaceSniffer | 6.7 | RecognisedAPIDocumented | Free | Yes | — | windows | View |
| 21 |  WinDirStat | 6.7 | RecognisedAPIDocumented | Free | Yes | — | Windows | View |
| 22 |  winTrim | 6.7 | RecognisedAPIDocumented | Free | Yes | — | windows, macos, linux | View |
| 23 | DiskMapper | 6.7 | RecognisedAPIDocumented | Free | Yes | — | macos | View |
| 24 |  DiskSavvy | 6.6 | RecognisedAPIDocumented | $250/mo | No | — | Windows | View |
| 25 | Neodisk | 6.6 | RecognisedAPIDocumented | Free | Yes | — | macOS | View |
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which disk space analyzer is ranked first on Inferse?
TreeSize is ranked #1 of 84 with a score of 7.5. FolderSizes is second and WizTree third.
How many of these have a free plan?
23 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, DiskAtlas has the lowest first paid tier we found: $5/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.