Visitors can get a comprehensive SEO report on their website. They can also generate a pdf document in case the report is for their clients.
The SEO analysis covers many aspets: content, links, keywords, accesibility, mobile, etc
There are many languages available and the main language can easily be switched.
Only hosting is needed to operate the website (shared hosting is ok). There's no need for any other human intervention.
Revenue comes from adsense or any other ad network