Lighthouse by Google

Lighthouse is an open-source, automated tool for improving the quality of your web apps. You can run it as a Chrome Extension or from the command line. You give Lighthouse a URL that you want to audit, it runs a barrage of tests against the page, and then it generates a report on how well the page did. From here you can use the failing tests as indicators on what you can do to improve your app. There are two ways to run Lighthouse, as a Chrome Extension, or as a command line tool. The Chrome Extension provides a more user-friendly interface for reading reports. The command line tool enables you to integrate Lighthouse into continuous integration systems.