Modernizr vs PDF.js: What are the differences?

What is Modernizr? Respond to your user’s browser features. It’s a collection of superfast tests or detects as we like to call them which run as your web page loads, then you can use the results to tailor the experience to the user. It tells you what HTML, CSS and JavaScript features the user’s browser has to offer.

What is PDF.js? A general-purpose, web standards-based platform for parsing and rendering PDFs. It is a Portable Document Format (PDF) viewer that is built with HTML5. It is community-driven and supported by Mozilla Labs. The goal is to create a general-purpose, web standards-based platform for parsing and rendering PDFs.

Modernizr and PDF.js are primarily classified as "JavaScript Compilers" and "Javascript Utilities & Libraries" tools respectively.

Some of the features offered by Modernizr are:

• Easy to deliver tiered experiences
• Make use of the latest and greatest features in browsers
• Without leaving less fortunate users high and dry.

On the other hand, PDF.js provides the following key features:

• General-purpose
• Platform for parsing and rendering PDFs
• Built with HTML5

Modernizr and PDF.js are both open source tools. It seems that PDF.js with 27.8K GitHub stars and 6.6K forks on GitHub has more adoption than Modernizr with 23.9K GitHub stars and 3.04K GitHub forks.