There is an attempt to build and open source version of Grammarly using vale rules here[1]. Rules are mainly regex based, but some target readability measures[2] or use parts of speech[3].
[1]: https://github.com/testthedocs/Openly
[2]: https://github.com/testthedocs/Openly/blob/master/Openly/Rea...
I won’t use another office product from them if so.
Seriously.
When enabled, it does basically send every keystroke to the mothership except in some fields on webpages and on mobile apps marked sensitive.
However, they do have what seems like a solid privacy policy in how they handle the data they receive.
Not to be a Debbie Downer, but that provides no comfort at all. The best privacy policy is to not have access to your data.
I would not use anything closed source and bloated as Word. I wrote my BSc. thesis in it in the 2000s. Could not open it correctly anymore after 5 years. It took ages to open.
Switched to vim and latex for my master and phd thesis. Never looked back ...
Very poorly worded on my part.