Yellow Lab Tools is an open source project by Gaël Métais. It allows you to test a webpage (via an URL) and detects performance and front-end code quality issues.

It is based on Phantomas, a tool that instruments Chrome Headless to collect dozens of metrics. These metrics are then categorized and transformed into scores. It also provides in-depth details so that developers can fix the detected issues.

By the way, it's entirely free. In return, you can add a on GitHub or buy me a coffee. It will boost my motivation to add more awesome features!

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