Lighthouse is an open-source, automated auditing tool for improving the quality of web pages. It provides a well-lit path for improving the quality of sites by allowing developers to run audits for performance, accessibility, progressive web apps compatibility and more. Basically, it “keeps you from crashing into the rocks”, hence the name Lighthouse.
The SEO audit category within Lighthouse enables developers and webmasters to run a basic SEO health-check for any web page that identifies potential areas for improvement. Lighthouse runs locally in your Chrome browser, enabling you to run the SEO audits on pages in a staging environment as well as on live pages, public pages and pages that require authentication.
Read more here.