harper
Developed by Automattic
Harper is an open-source, lightweight, and privacy-first English grammar checker developed by Automattic. Running entirely locally to guarantee absolute privacy, Harper lints documents in milliseconds while using less than 1/50th of LanguageTool's memory footprint. It is small enough to run in-browser via WebAssembly and integrates seamlessly with popular editors such as VS Code, Neovim, Obsidian, Zed, and Helix through its dedicated language server.
- Privacy-First Local Execution
- Millisecond-Level Performance
- Ultra-Low Memory Footprint
- LSP & Multi-Editor Integration
- WebAssembly Support
webdesktop