Hi Friend. Congrats on the launch.
I like the idea because I am very bad in design, creating promo and etc. And I usually use such tools, what I can find in internet. Your product solves this issue.
As far as I understood, your product is completely free but contains watermarks. And if smb wants to put it away, it becomes payable, Right?
I think, that good idea is to add some Gifs on the website which show how it works.