How do you mean? A tool to help you relate to the folks you're cold-emailing? It seems like a way to find common ground.

Maybe I am misreading you, but perhaps you think the effect is a dishonest one? That because the language EmailFox helps you find isn't the phrasing you improvised at first blush, it's not your copy?

If the UX is strong, think of the wonders this could do for non-fiction writing!