Yellow Lab Tools runs on a Node.js server and lets developers test a website (via an URL). This is done by accessing the website via PhantomJS and collecting various metrics and statistics.
These metrics are then manipulated and presented in an easy to understand manner, organized in categories of interest.
The main utility is a grading feature that provides A-to-F grades based on the performance of various utilities and operations like DOM complexity, DOM manipulation, the number of HTTP requests, network interactions, CSS complexity, and so on.
All in all, Yellow Lab Tools can be really useful for both beginner and advanced coders, helping them improve or fix the way they write JS and CSS, boosting page loading speeds and their code’s overall performance.