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Wordbook vs WordWeb: catalog facts
Wordbook	WordWeb
Free Free and open source under the GPL-3.0-or-later licence.	Freemium A free version is available, with WordWeb Pro sold separately.
Linux	Windows
Works fully offline Pronunciations through eSpeak	Offers one-click lookup from Windows programs Includes offline definitions and usage examples
English only Linux only	The free version is subject to licensing
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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