I think your pricing and plans need work. To my mind, there are roughly 4 kinds of people that would pay for your service. First is that lone amateur, maybe thi

I think your pricing and plans need work. To my mind, there are roughly 4 kinds of people that would pay for your service. First is that lone amateur, maybe thinking about building something great, who you want to get in at the ground floor. Then there's the slightly more serious person or team running a startup website/blog, or something of that nature. Then there are the bigger companies who run a number of media properties, and finally, the SEO consultant/maven/spammer who is managing many sites at once. This pricing doesn't seem attractive to anyone except the first group, who, incidentally, would probably sign up for only the free version. Even a small (serious) startup is going to be interested in more than 100 or even 500 keywords, and probably has more than one site (personal blogs, company blogs, product landing pages, other projects leading to the startup, etc.). And then when you talk about a bigger project running multiple websites or an SEO consultant/agency, the idea of paying per site & per month & being capped on keywords would scare them away. I think you've sort of copied the standard SaaS pricing model without really considering your audience. Get "out of the building" and find out who your customer is (surely I'm off base with my 4 groups, its a blind shot). Then price according to what the market will bear. My sense is that you'll want a free version, a version for people running a small company (a few sites, a bunch 'o keywords), and people running many media properties (many sites, an astronomical number of keywords). The current caps on keywords make me think an engineer picked the limits, not someone who had done SEO before. Edit: I realized I failed to mention I think this is a great service at first glance. Didn't mean to go instantly negative, just trying to give constructive feedback.