Similar to Lighthouse, the Microsoft Edge team has also released a new site linting tool called Sonar. Like Lighthouse, it is an open source node module that serves as a testing harness to execute rules over a web page.
The two tools offer similar testing abilities, but also offer a different set of abilities and test batteries. Both provide a default starting point to execute a base set of tests on a page. Both can be customized with your own configurations and even extended with custom tests and reports.
Unlike Lighthouse, Sonar is not built into the browser developers tools. At least not yet, and I only say that because I could see the tool being integrated into Edge at some point, like Lighthouse is in Chrome.
Sonar also differs because it can execute tests in either Microsoft Edge, Chrome, or other testing libraries....