The Grammarly App for iOS was recently updated, and it now includes access to the Grammarly editor on iPad rather than having to upload text to their website. This is a nice new feature, however, I am impressed by the updated Grammarly keyboard and how it integrates with Ulysses. I think this integration now solves the issue of having an advanced grammar checker available to check your text on Ulysses.
I have tried the Grammarly keyboard with Apple’s Pages and Microsoft Word, and it does not work very well with these word processors. Maybe, the Grammarly keyboard works better with plain text and markdown rather than rich text?