Harper is a free Chrome add-on designed to enhance your writing by providing instant grammar checks while maintaining your privacy. Unlike traditional grammar tools that may compromise user data, Harper operates entirely within your browser, ensuring that your text remains confidential. This tool supports four English dialects—American, British, Canadian, and Australian—making it versatile for various writing styles. It also boasts a clutter-free interface, eliminating interruptions from ads or subscription prompts, allowing users to focus solely on their writing.

The extension is particularly beneficial for writers and developers alike, as it efficiently identifies awkward phrasing and typos without altering the original syntax, making it ideal for technical documentation. Built with an open-source, Rust-powered framework, Harper invites users to inspect and adapt the code to suit their needs. This lightweight tool serves as a reliable companion for anyone seeking to refine their prose without sacrificing privacy.