Comment by nickjj

I would never use it but this feels like a common issue in general which is trading convenience for privacy and security.

This happens with a lot of choices. Smartphone vs flip phone, using an Alexa or similar device vs not, etc..

A fully offline Grammarly would be a really nice app to have. I'd pay something like $49 a year to have access to that if it worked really well and was kept up to date. The hard part is "really well", it's so much more than detecting spelling errors with a Vim plugin. At the same time I have a feeling the "goodness" of a tool like this is only because of how much data it can harvest to train its algorithms and models which makes me think it won't happen until accurate models are in the public domain.