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Harper | Privacy-First Offline Grammar Checker for Developers & Writers

writewithharper.com

Harper is a blazing-fast, open-source grammar & spell checker that runs entirely on your device, covering US, UK, Canadian, Australian & Indian English—no data ever leaves your machine. Harper is the only grammar checker that doesn't use AI.

Security & Privacy Developers Open Source Harper

2026-10-29

Practical guides

What Is Harper, the Privacy-First Offline Grammar Checker?: Harper is an open-source grammar and spell checker that runs entirely on your own device. Every check happens locally—no cloud round-trips, no teleme…