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Artha vs WordWeb: catalog facts
Artha	WordWeb
Free Free and open source under GPL-2.0.	Freemium A free version is available, with WordWeb Pro sold separately.
Windows, Linux	Windows
Looks up selected text with a configurable hotkey Works offline using WordNet	Offers one-click lookup from Windows programs Includes offline definitions and usage examples
English thesaurus only	The free version is subject to licensing
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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