SEO is important to attract traffic. Most people check set out SEO
goals in the beginnings of a web page and check in the end. It's
easy to change the site and then forget to check again. When
checking SEO the whole time continously during development, it's
nothing that you forget.
Inpage SEO Checker comes with some sensible default settings that
worked for me. You can configure it though to your likings, changing
min and max value and turning checks off.
The Inpage SEO Checker does basic onpage SEO checking. Number of
H1,H2,H3 tags, checking for alt attributes on iMG tags, META
description and keywords, page title and EM and STRONG tag usage.
impact your development, and some even leave it in the page during
production, to be alerted if page changes hurt SEO.