Your rank in search engine result pages will be determined by the quality of your content.
SEO grep will help advise you on how best to expose this content to search engines in order to gain the best possible rank.
We are currently in beta and therefore have limited server and bandwidth capacity. Once we leave beta, we should be able to expand our analysis to full sites.
Following the advice on SEO grep should only be part of an optimization strategy.
You should also focus on creating relevant content for your target audience, building links to this content and analysing how your optimizations are performing.
SEO grep is not a replacement for manual SEO, but a tool to help assist you with this task.