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Harper vs Linguix: catalog facts
Harper	Linguix
Free Free and open source.	Freemium Free to start, with team features offered on top.
macOS, Web, Browser extension, Command line	Web, Browser extension
All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS	Works on websites across browsers through an extension Grammar and spell checking in seven languages with automatic detection
English only Rule-based checks do not rewrite text the way AI assistants do	Needs an account to use Text is processed by an online service
Downloadable app, Web application, Browser extension	Web application, Browser extension
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
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 26, 2026

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