Harper

Harper is an English grammar checker that runs entirely on your device, so nothing you write is sent to a server. It is written in Rust, takes milliseconds to check a document and is small enough to run in the browser through WebAssembly. It is developed under Automattic.

Harper uses less than 1/50th of LanguageTool's memory, according to the project, and treats slow checks as bugs. It works in Obsidian, in code editors through its language server (harper-ls) and in the browser. It currently supports English, with a core designed to add other languages.

Harper gives you grammar checking without sending your writing to anyone, and it is fast enough to use everywhere. It is Apache-licensed.

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Automattic/harper

• GrammarlyCloud-based writing assistant with grammar and style checks.
• LanguageToolNo. 178Grammar and style checker for many languages.
• ProWritingAidGrammar checker and style editor for writers.

See every open-source alternative to Grammarly in the collection.