When you enable any third-party keyboard, Android displays a message that says the keyboard may be able to collect the text you type, including personal data like credit card numbers. We know that our users may (understandably) be concerned about this, so we want to provide some more detail about how we protect your privacy.
Android displays this message because it is technically possible for a third-party keyboard to collect sensitive information. However, we have blocked the Grammarly Keyboard from accessing anything you enter in fields marked “sensitive.” That includes credit card forms and password fields. We have also blocked the keyboard from accessing text you type into search fields, URL fields, or email address fields.