In order to get someone to purchase something, you have to ask the question from the customers point of view, what is in this for me.
I took a quick look at your site and I don't see that question answered anywhere. I see all of the great things it can do. But why would I want to use this application? How does it make my life easier? Sit down and write the benefits out and then your marketing becomes much easier.
Answer those questions and then you can start to use SEO and other marketing tools to get your website noticed.