I'm trying to build a cheaper alternative to the big SEO tools and would like feedback

I'm a software developer by trade, but for my job and side-projects I sometimes need to dabble in some SEO. The problem I faced is that the big tools are way to expensive for my simple use cases and they offer a bunch of stuff I don't really need. What I wanted is a cheap pay-per-use tool. I couldn't really find it, so decided to build it myself.

This project is live now, and is called rankrankrank.com

So if anyone would be interested in providing some extra feedback for this project, give me the email you have signed up with and I will give you a big chunk of extra credits to test out the tool for free. All I'm asking is your honest opinion on how I can improve the website and the tools it provides.

Thanks!