SEO Audit Application

I would like to have an application to run an SEO audit on a site so I
can share it with my clients. Maybe run the audit, produce a report then
run it again with all the boxes ticked to add a bit of value to my
assurance that their site is well set up for Search Results.

Is there a good one? That doesn't have too much nonsense in it and will
give me a saveable detailed result which will look good?

I am using a WooRank Chrome App atm. I like everything to be free.

Tim W