[Xelynega]

Correct me if I'm wrong, but the tool in the OP sounds like a crowdsourcing effort to collect the data the Facebook tool can tell you across multiple users and multiple sites.

That's not really the same thing as a tool that tells a single person that the site they're on uses meta pixel as it happens.

[kripy]

Correct. The Facebook Pixel Helper is used to test that the pixel has been installed correctly and events, both standard and custom, are firing correctly.