The marketing copy is puzzling to me. Two things it highlights are what I would consider standard and required features for any text editor; the ability to work offline and the ability to save and edit text files.
If your text editor can't save and edit text files (!?!) and can only be used online, it's hardly even worth calling a text editor. That Hemingway can do what's required is necessary, but why draw attention to those things instead of actual, you know, features?
Edit: by the replies, I see these features make sense in comparison to Hemingway the web app. However, if this page is also intended for people not familiar with the web app, I stand by my points.
"can only be used online" doesn't make something not a text editor.
The other point is "Save and open" not "save and edit." This is explained in the next paragraph. It's in contrast to the workflow in the online Hemingway app.
If your text editor can't save and edit text files (!?!) and can only be used online, it's hardly even worth calling a text editor. That Hemingway can do what's required is necessary, but why draw attention to those things instead of actual, you know, features?
Edit: by the replies, I see these features make sense in comparison to Hemingway the web app. However, if this page is also intended for people not familiar with the web app, I stand by my points.