When comparing JS Bin vs Codepen, the Slant community recommends Codepen for most people. In the question“What are the best code playgrounds and pastebins?” Codepen is ranked 4th while JS Bin is ranked 7th. The most important reason people chose Codepen is:
CodePen makes it really easy to export code as a zip or Github Gist.
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Pros
Pro Open-source
Pro Simple UI
Each panel can be made full height and be closed if not used
Pro Easily export your pen
CodePen makes it really easy to export code as a zip or Github Gist.
Pro Real time output
Pro Lots of support for frameworks and preprocessors
CodePen has an impressive amount of support for preprocessors (such as Jade, Haml, Slim, Sass, Less, Stylus, Coffeescript and PostCSS). There is also plenty of frameworks and libraries to pick from (Foundation, Bootstrap, Angular, D3, Backbone, Ember etc.).
Pro Great display/profile page
The codepen profile page allows you to display all of your public pens, and control which order you want them to be viewed in. This is great for showing off your work to possible employers, other devs etc..
Pro Easily fork pens
To fork a pen only requires clicking one button, and you'll be able to modify the pen on your own account.
Pro Great community pens
You can search through other pens, either by keyword or popular, picked or recent.
Cons
Con No private pens with free account
There is an option on Codepen for private pens, however it requires upgrading to a Pro account ($9/month).