# Open-source alternatives to TreeSize Personal and Professional

> We track 2 open-source alternatives to TreeSize Personal and Professional, but none currently has confirmed commercial use, local running and no paid services together. None of the 2 projects we track covers all 5 TreeSize Personal and Professional jobs, so most people combine two or more.

TreeSize Personal and Professional: JAM Software's disk space analyser for Windows. The free edition, for private non-commercial use, shows space down to file level with a treemap and PDF reports. Personal adds duplicate file search, Excel, CSV, HTML and SQLite exports and disk usage history. Professional adds scheduled scans and exports, command-line use, portable install and server shares. Pricing: Personal 20.40 EUR per user per year; Professional from 41 EUR per user per year; Free edition for private, non-commercial use (checked 2026-10-21). Facts checked 2026-10-21.

## Projects

| Project | Use it instead? | Jobs | Runs locally | Commercial use | Paid services | Hardware |
|---|---|---|---|---|---|---|
| [Czkawka and Krokiet](https://repoquarry.dev/projects/czkawka) | Personal use: Yes. Business: Partly (Commercial use with conditions: Free to use at work; GPL conditions apply if you distribute a modified Krokiet app). | duplicate-file-finder, largest-file-finder, junk-file-cleanup | Yes, desktop and command-line app with no internet access | Free to use at work; GPL conditions apply if you distribute a modified Krokiet app | None; free with no ads | Not documented; similar-video search needs ffmpeg |
| [WinDirStat](https://repoquarry.dev/projects/windirstat) | Personal use: Yes. Business: Partly (Commercial use with conditions: Free to use at work; GPL conditions apply if you distribute modified versions). | disk-usage-analysis, largest-file-finder, duplicate-file-finder, disk-usage-reports | Yes, Windows desktop app; scans local drives, folders, network shares and MTP devices | Free to use at work; GPL conditions apply if you distribute modified versions | None; no account or paid edition | Not documented |

## Common questions

### Is there a free, open-source alternative to TreeSize Personal and Professional?

Yes. WinDirStat and Czkawka and Krokiet are free to download and run on your own computer without paid API keys. Each covers only part of what TreeSize Personal and Professional does, so check which job you need.

### Can I do see what uses disk space down to file level locally without a TreeSize Personal and Professional subscription?

Yes, with WinDirStat (GPL-3.0-or-later). Check the hardware notes and licence conditions on each page before you start.

### Can I do find the largest files locally without a TreeSize Personal and Professional subscription?

Yes, with WinDirStat (GPL-3.0-or-later) and Czkawka and Krokiet (MIT AND GPL-3.0-only). Check the hardware notes and licence conditions on each page before you start.

### Which TreeSize Personal and Professional alternatives can I use commercially?

With conditions: Czkawka and Krokiet and WinDirStat. This is not legal advice; read each licence.

### Does any open-source project replace all of TreeSize Personal and Professional?

Not as of 2026-10-21. See what uses disk space down to file level, find the largest files, find and remove duplicate files, export disk usage reports (Excel and scheduled scans and exports are covered by different projects.

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Source: RepoQuarry (https://repoquarry.dev/alternatives/treesize). Data licence: CC BY 4.0. Quotes are from project documentation and belong to their authors.