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Hand-picked for quality and usefulness
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.
When auditing a page, Lighthouse runs a barrage of tests against the page, and then 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.
Quick-start guide on using Lighthouse: https://developers.google.com/web/tools/lighthouse/
View and share reports online: https://googlechrome.github.io/lighthouse/viewer/
Github source and details: https://github.com/GoogleChrome/lighthouse