Comparing web library analyzers

If you ever land on a site and wonder how it was built, then you might find these Chrome extensions useful. This article will compare the two most prominent options.

Yuval Greenfield
4 min readJan 24, 2021
Normally, you’d have to go into the source and http headers yourself to find this information. Image from Pixabay

Library Sniffer

Library Detector

Raw comparison results

Library Detector — found nothing.
Library Sniffer — found SPDY, GitHub.

Library detector mentions jQuery twice, and core-js is a huge amount of text for some reason. jQuery 1.12.3, jQuery (Fast path), React, Modernizr 3.6.0, Moment.js 2.29.1, core-js.

It is pretty interesting to see that reddit uses Varnish and react.