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.
Languagetool’s browser extension is no longer open source, which has me concerned. You can still point it at a local server, but yeah.