Harper Language Server Automattic Inc.

developer-tools english-language grammar-checker rust webassembly

Use this command to install Harper Language Server:

winget install --id=Automattic.harper-ls -e

Harper Language Server is an offline grammar checker built using Rust, designed to provide fast, privacy-first writing support. It adheres to the Language Server Protocol (LSP), enabling seamless integration with text editors and IDEs.

Key Features:

Real-Time Grammar Checking: Instantly highlights grammatical errors and provides suggestions for improvement.
Multi-Language Support: Capable of analyzing and correcting text in multiple languages.
Distraction-Free Writing: Designed to keep writers focused while maintaining high accuracy.
High Performance: Built with Rust for speed and efficiency, ensuring minimal impact on system resources.
Winget Installation: Available via winget for easy setup.

Audience & Benefit: Ideal for writers, content creators, and professionals who prioritize privacy and need reliable grammar assistance. Harper Language Server empowers users to produce clear, error-free text without compromising their data security or workflow efficiency.

Harper

NPM Version Downloads Obsidian Plugin Downloads

Harper is an English grammar checker designed to be just right. I created it after years of dealing with the shortcomings of the competition.

Grammarly was too expensive and too overbearing. Its suggestions lacked context, and were often just plain wrong. Not to mention: it's a privacy nightmare. Everything you write with Grammarly is sent to their servers. Their privacy policy claims they don't sell the data, but that doesn't mean they don't use it to train large language models and god knows what else. Not only that, but the round-trip-time of the network request makes revising your work all the more tedious.

LanguageTool is great, if you have gigabytes of RAM to spare and are willing to download the ~16GB n-gram dataset. Besides the memory requirements, I found LanguageTool too slow: it would take several seconds to lint even a moderate-size document.

That's why I created Harper: it is the grammar checker that fits my needs. Not only does it take milliseconds to lint a document, take less than 1/50th of LanguageTool's memory footprint, but it is also completely private.

Harper is even small enough to load via WebAssembly.

Language Support

Harper currently only supports English, but the core is extensible to support other languages, so we welcome contributions that allow for other language support.

Performance Issues

We consider long lint times bugs. If you encounter any significant performance issues, please create an issue on the topic.

If you find a fix to any performance issue, we would appreciate the contribution. Just please make sure to read

Harper Language Server Automattic Inc.

README

Harper

Language Support

Performance Issues

Links

Huge Thanks