LanguageToolCheck spelling, grammar and writing style in documents and browser text fields.
Basic plan free (browser extension/web editor); Premium adds more checks, paraphrasing and longer texts. Core engine LGPL and self-hostable.
AI writing assistants, grammar checking & clarity linting
Free alternatives to Grammarly Premium
Find a free app for the parts of Grammarly Premium you actually use.
Compare the free allowance and limitations on each app’s page. These are workflow alternatives, rather than identical copies.
Free options
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HarperCheck grammar locally in your editor, browser or command line.
Everything (Apache-2.0).