You get audit tools, and you get tools with audit features built-in. But unless you're a seasoned SEO folk, chances are you'd look at the reports, fix 1-2 things and just give up.

The typical SEO audit from most of the tools looks like a wall of texts and links, and it's often overwhelming.

SiteGuru is like having a good pal who's great at SEO look at those reports, and break them down into Content, Technical, Links, Non-branded traffic, Keywords, etc... then tell you how to improve each of them.

A very easy-to-understand report in bite-size pieces that helps you make sense of all the issues on your website. I would highly recommend this.