this post was submitted on 25 Nov 2025
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Harper: Free, Open Source Grammar Checker (writewithharper.com)
submitted 6 days ago by cm0002@suppo.fi to c/opensource@programming.dev
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What is it?

Harper is a free English grammar checker designed to be just right. You can think of it as an open-source alternative to Grammarly. I created it after years of dealing with the shortcomings of the competition.

Private

Harper is completely private, in every sense of the word.

Since Harper runs on-device, your data doesn't go anywhere you don't want it to.

That means you have 100% certainty we don't violate your copyright by training large language models.

Harper also intentionally avoids including any kind of generative AI in any part of our processing pipeline.

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[–] Flagstaff@programming.dev 1 points 2 days ago* (last edited 2 days ago) (1 children)

You may like to read @thatonecoder@lemmy.ca's comment, which basically says that they're working on patching these holes.

[–] Kissaki@programming.dev 1 points 1 day ago (1 children)

That comment doesn't say anything about what I'm asking about here.

[–] Flagstaff@programming.dev 1 points 1 day ago

Fine, then: LLMs hallucinate and make mistakes. You can't beat rules in grammar; get detailed enough and everything will work. My point is that they are actively working on refining rules, which is the best any of us could ask for.