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ChatDOC vs LightPDF: catalog facts
ChatDOC	LightPDF
Freemium Pricing details were not in the research; check the site for current plans.	Freemium Free online tools, with a paid Pro plan for full editing and AI features.
Web	Windows, macOS, Android, iOS, Web
Summarizes long PDFs quickly Explains complex passages in plain language	Available on web, desktop and mobile Editing, conversion, OCR and signing in one tool
Documents are uploaded to a hosted service AI answers need checking against the document	Full features require a Pro subscription Online tools send documents to the vendor's servers
Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 24, 2026

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