Harper, a privacy-first, offline grammar checker, works in every app users open — Mail, Slack, Notes, Pages, Discord, and any macOS text field. Runs locally with sub‑10ms suggestions, no cloud, free & open‑source (Apache‑2.0). Download: https://writewithharper.com/desktop 🚀🖥️ #macOS #writing #opensource
Also available via Brew and Linux, Windows will come soon too