Best grammar checker

Don’t use Grammarly, the grammar checker funded by Silicon Valley.

So far I have only come across one alternative, but this page will be available if and when others launch.

Alternative to Grammarly:

• Harper, which the developer describes as “an open-source alternative to Grammarly”:

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.

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