Harper: free open-source Grammarly alternative checks grammar offline in under 10ms
thisguyknowsai · x · 2026-11-10
Blogger thisguyknowsai highlights Harper, a free, open-source grammar checker positioned as a Grammarly alternative. Unlike cloud tools that upload your text, Harper runs a lightweight Rust-based grammar engine entirely on-device, delivering suggestions in under 10 milliseconds even without internet. It has no premium tier, no account, no cloud processing, no telemetry, and no AI training on your writing, and is licensed under Apache 2.0—pitched as fast grammar checking without handing over your private drafts.
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