Lightest

lightest.app is a neat website to compare and visualize initial load times of web pages. The use cases are pretty interesting:

• Compare your web page load time against competitors.
• Don't know what website builder platform to choose? Evaluate their showcase sites and templates on performance, accessibility, and SEO metrics.
• Evaluate Bootstrap or WordPress themes before you buy.
• Compare site performance built with different technologies to prove your choice.
• Compare sites and apps on different hosting and cloud providers to be sure that your website will serve fast.