Fable vs Modernizr: What are the differences?

Developers describe Fable as "F# to JavaScript Compiler". It is a compiler powered by Babel designed to make F# a first-class citizen of the JavaScript ecosystem. On the other hand, Modernizr is detailed as "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.

Fable belongs to "JavaScript Compilers" category of the tech stack, while Modernizr can be primarily classified under "Javascript Utilities & Libraries".

Some of the features offered by Fable are:

• Functional programming and more
• Type safety without the hassle
• Modern Javascript output

On the other hand, Modernizr provides the following key features:

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

Modernizr is an open source tool with 24.5K GitHub stars and 3.04K GitHub forks. Here's a link to Modernizr's open source repository on GitHub.