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Open-source alternatives to TreeSize Personal and Professional

TreeSize Personal and Professional does 5 jobs: see what uses disk space down to file level, find the largest files, find and remove duplicate files, export disk usage reports (Excel, scheduled scans and exports. Most projects replace one or two of them, so pick the job you actually need.

Quick answer

Facts checked 21 Oct 2026

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.

Compare Czkawka and Krokiet, WinDirStat with TreeSize Personal and Professional →Jobs covered, cost, GitHub activity and star growth, side by side.

2 projects

Czkawka and Krokiet

qarmin/czkawka

Fast Rust app that finds duplicates, big files, empty folders, temporary files and similar images or videos to free space.

Replaces Find the largest files + Find and remove duplicate files (partly) Not: see what uses disk space down to file level, export disk usage reports (Excel, scheduled scans and exports

Use it instead of paying for TreeSize Personal and Professional?

Personal use: Confirmed: Yes
For a business: Partial: Partly Commercial use with conditions: Free to use at work; GPL conditions apply if you distribute a modified Krokiet app

Runs locally: Confirmed: Yes
Commercial use: Partial: Conditions · MIT AND GPL-3.0-only
Paid services: Confirmed: None required
Hardware: Unknown: Unknown
Setup: Confirmed: Easy

Compare 7 of 8 facts sourced · checked today GitHub ↗ View details

WinDirStat

windirstat/windirstat

Disk usage analyser for Windows with treemaps, largest-file and duplicate finders, CSV/JSON exports and cleanup tools.

Replaces See what uses disk space down to file level + Find the largest files + Find and remove duplicate files + Export disk usage reports (Excel (partly) Not: scheduled scans and exports

Use it instead of paying for TreeSize Personal and Professional?

Personal use: Confirmed: Yes
For a business: Partial: Partly Commercial use with conditions: Free to use at work; GPL conditions apply if you distribute modified versions

Runs locally: Confirmed: Yes
Commercial use: Partial: Conditions · GPL-3.0-or-later
Paid services: Confirmed: None required
Hardware: Unknown: Unknown
Setup: Confirmed: Easy

Compare 7 of 8 facts sourced · checked today GitHub ↗ View details

Common questions about TreeSize Personal and Professional alternatives

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.