We have built over 500 tests to check different aspects of your site. And adding new all the time.
Basic SEO
Are you using the correct HTML tags, and is the site structured in a way that is simple for the search engines to find and index you?
Security
We will check for old frameworks and security tags and tell you if it is time to upgrade.
Server
Is your server set up correctly to be able to deliver your site at lightning-fast speeds?
Caching
Are all files and resources defined with the correct caching routines? Are you loading stuff you don't need?
Images
Are you using the right images types? Or are you bloating your site with image formats from 1998?
Resources
Go through javascript & CSS files to find what is optimal and unnecessary loading.
And a lot more!
You could have the best SEO text in the world, but if you don't fix the basics, your site will never rank.