InstantClick is a library based on Javascript. It is used to enhance the website performance and increase navigability. It is designed to help users with bandwidth and latency issues. It provides preloading of links. It also offers a testing feature. Its latest version is InstantClick 3.1. 

InstantClick works by way of pushState and Ajax. It provides a progress bar that is designed to be customizable. InstantClick is available for mobile devices as well. It works for mobile devices of different sizes. It allows its users to set delays with ease before the preloading begins. It helps prevent the possibility of wasted requests effectively. InstantClick provides blacklisting along with events and script re-evaluation.

Modernizr is a library based on JavaScript. It is a fully open-source application. It offers a feature detection system for browsers. It is known for its user-friendliness and reliability. It offers a conducive space for testing and detection. It is widely used by web developers to receive insights into browsers and devices. It is known for its capability of delivering tiered experiences with ease.

Modernizr is known for its minimal size. It gives scope to users to create CSS rules for feature availability and apply them with ease. It is available for use on the latest browsers.

Comparison InstantClick vs Modernizr