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Filelight vs Folder Size: catalog facts
Filelight	Folder Size
Free Free and open source under the GPL.	Freemium Free to use, with a paid registered edition available.
Windows, Linux	Windows
The ring chart makes the biggest space consumers immediately obvious Scans remote and network locations as well as local disks	Bar and pie charts of disk usage Works on network shares and NAS devices
Pulls in KDE libraries on non-KDE desktops	Windows only Some functions tied to the paid registered edition
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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