Really useful tool for developers or anyone interested in code. Codepen allows you to test new development languages, new CSS properties or little code snippets very easily, just typing the code or copy-pasting it from a post or tutorial!
It´s 100% online and collaborative. This means that your code is public and anyone can fork it and create their own project. Same way, you can take advantage of other people’s code and examples.
You can use Codepen totally free, but if you want to have premium options like private pens, Live View, the ability to embed your code in a website or presentation…and many more options, you can become a Pro user for a monthly fee.