Private Grammar Checker - Harper is a subscription-based tool designed for users who prioritize privacy while writing. This application operates entirely offline, ensuring that no data is sent to the internet, thus eliminating concerns about tracking or ads. It provides real-time grammar and spelling suggestions, making it a valuable resource for writers, developers, and anyone looking for a streamlined writing experience. With support for various English dialects, including American, British, Canadian, and Australian, Harper caters to a wide audience.

The application is particularly beneficial for those who work with Markdown or technical documentation. Harper's open-source nature allows users to inspect and contribute to its development, promoting transparency. Built in Rust for optimal performance, it offers fast and efficient feedback without the clutter of popups or unnecessary features. Overall, Harper stands out as a user-friendly, privacy-centric grammar checker that meets the needs of diverse writing styles.