Harper

Harper is an open-source, on-device grammar checker designed to provide real-time writing assistance. By operating locally, it offers a privacy-focused approach to proofreading and text correction.

What Harper does

Harper monitors text input to identify and correct errors in grammar, spelling, and capitalization. Because it functions as an on-device tool, it processes text locally rather than relying on external cloud servers, which helps maintain user data privacy while providing immediate feedback during the writing process.

Who it helps

This tool is intended for writers, developers, and privacy-conscious users who require automated proofreading support. It is particularly useful for individuals who prefer open-source software solutions that do not transmit their personal or professional writing to third-party services for analysis.

Notable capabilities

• Real-time grammar checking
• Automated spelling correction
• Capitalization error detection
• Open-source architecture
• On-device processing for enhanced privacy