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TreeSize Free vs Filelight: catalog facts
TreeSize Free	Filelight
Freemium TreeSize Free is free for private and commercial use. TreeSize Personal, Professional and…	Free Free and open source under the GPL.
Windows	Windows, Linux
Reads the NTFS master file table, so scans finish quickly Folder tree sorted by size, updating while it scans	The ring chart makes the biggest space consumers immediately obvious Scans remote and network locations as well as local disks
Windows only and closed source Duplicate search, reports and exports need a paid edition	Pulls in KDE libraries on non-KDE desktops
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.