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Grammarly for Microsoft Edge vs Harper: catalog facts
Grammarly for Microsoft Edge	Harper
Freemium The extension is free to install, with paid Grammarly plans for more features.	Free Free and open source.
Browser extension	macOS, Web, Browser extension, Command line
Checks grammar and spelling directly in web pages AI suggestions for rewriting and drafting text	All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS
Text is processed by Grammarly's online service Only covers writing done inside the browser	English only Rule-based checks do not rewrite text the way AI assistants do
Browser extension	Downloadable app, Web application, Browser extension
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 26, 2026

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