When comparing Can I use... vs Codecademy, the Slant community recommends Codecademy for most people. In the question“What are the best resources to learn CSS?” Codecademy is ranked 3rd while Can I use... is ranked 12th. The most important reason people chose Codecademy is:
Right from the start, users write code. They start small in an environment that has constant feedback and gradually progress to more complex concepts. Users can see code results instantly, giving great feedback.
Specs
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Pros
Pro Supplies usage data for all countries
Pro Provides good list of resources
When serching for a feature you typically find a nice list of really valuable resources, such as spec on w3c website, and blog posts desribing usage in details.
Pro Interactivity
Right from the start, users write code. They start small in an environment that has constant feedback and gradually progress to more complex concepts. Users can see code results instantly, giving great feedback.
Pro Excellent progression
Codeacademy doesn't overwhelm beginners with information. It gives bite-sized information, the bare minimum needed to finish a task and get to the next one. As the course progresses, it slowly fills in background information.
Pro Good editor
Codeacademy has a powerful, beginner-friendly integrated development environment (IDE) that can also be used outside of curriculum.
Pro Bite-sized lessons
Each lesson in code-academy focuses on a single concept, and repetition is provided to drill the concept.
Pro Mostly free content & best progression series for beginners
Pro Community forums
It has forums which can be used to discuss with other learners
Cons
Con Not that good for learning
It's a super cool catalogue for people who know what they are doing, just to check if their tricks apply to certain use case or project. It doesn't serve as a good starting point nor roadmap for css newbies.
Con Not the best structure for quick refreshers
The content of the lessons is aimed very much at people just starting to learn how to code. This is perfect for beginners but if you want to use Codecademy to refresh your knowledge the lessons are not designed to be quickly done.
Con Lack of context
Codecademy is great for providing a hands-on approach, but there is a lack of context regarding how to start a project in real life. While users may learn how to code using Codecademy's interface, they may not have any idea how to code independently.
Con Sticks to pretty basic
Con Deleted a lot of content
A lot of free content has been taken away, for example the PHP course was removed from the site.
Con Buggy
Codecademy is known to have many bugs which interfere with the editor, resulting in error messages despite having the correct answer.
Con Allows infinite loops to run
If you run an infinite loop, the browser freezes. Many other similar websites will give you an error, preventing the loop from running. Though not a bug, the lack of feature to stop infinite loops from running can be quite frustrating to beginners.