When comparing Codeply vs Codepen, the Slant community recommends Codepen for most people. In the question“What are the best web development playgrounds?” Codepen is ranked 3rd while Codeply is ranked 8th. The most important reason people chose Codepen is:
CodePen makes it really easy to export code as a zip or Github Gist.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Responsive frameworks included
Bootstrap, Foundation, Materialize, Pure CSS, Skeleton, Semantic can all be referenced simply.
Pro Responsive preview
Test different screen widths and standard viewports.
Pro Snippets in editor
Grab code snippets right from the editor UI.
Pro Free
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 Private and upgrades not available
One time donation unlocks Private Ply's.
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).