Create an seo and web accessibility analyzer

Question

i want to make a web tool for search engine optimization and web accessiblity  I only know PHP and a little bit Rails

I need some feedback on what I should and should not do. Everything from how I should make the crawl process to what I should be checking for in regards to SEO and WCAG

Answer 1

there are some tools which  are already doing the same functions so just go check them out

there are already tool that i can check some properties for free of cost so  check the properties and some are

domain names , links , inbound links

MATA property semantic structure