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Writing Tools vs Grammarly: catalog facts
Writing Tools	Grammarly
Free Free and open source; cloud model providers may charge separately.	Freemium Free to sign up, with paid plans for more features.
Windows, macOS, Linux	Web, Browser extension
Works on selected text in any application Supports local LLMs as well as cloud APIs	Grammar, spelling and clarity checks as you type One-click paragraph rewrites and tone suggestions
Needs an API key or a local model set up Output quality depends on the chosen model	Requires an account Text is processed on Grammarly's servers
Downloadable app	Hosted service, Browser extension
Open source	Closed source
License not stated	License not stated
No account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 23, 2026

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