The following image shows the Grammarly option in an open Google email, which is available when you download the browser app:

The Grammarly add-on unfolds with three options when you mouse over the errors. You can:
- Turn off the error checker.
- Open to view the errors found.
If there are no errors, you may see the green Grammarly logo or a green check mark.
The error cards function just the same as they would inside the Grammarly website.