When comparing Codio vs Glitch, the Slant community recommends Codio for most people. In the question“What are the best cloud IDEs?” Codio is ranked 12th while Glitch is ranked 14th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Designed to teach programming

Pro Fully functional terminal
Codio gives you full access to a terminal, with all the ubuntu commands. You can use the terminal within the page, or you can access by SSH from your computer.
Pro Emmet
Emmet support for a whole range of features that really boost productivity when working with HTML and CSS. These features include expanding abbreviations into full HTML or CSS as well as some very powerful keyboard shortcuts.
Pro BitBucket integration
It's possible to launch Codio from within BitBucket's repo by adding Codio integration as an add-on.
Pro Server-side environment

Pro Node.js included by default.
Pro Monokai
Includes Monokai style theme by Luigi Maselli.
Pro Unlimited number of public and private projects for free
Pro Runs a server out of the box
Perfect for building web applications, be it client-only, server-only, or full stack.
Pro Private data are kept secret, even in public projects
Non-collaborators can't access private data (e.g. API keys) which are stored in a special file, and they are deleted when a project is forked.
Pro Persistent storage
Pro Multiple languages supported
Although the only official language/framework is Node.js, you can access the terminal and install other languages via apt-get (as long as it doesn't exceed the storage limit).
Pro VS Code integration
If you feel the built-in web editor is not sufficient, you can switch to VS Code and get the full power of its plugins. You still work with the files and server in the cloud, no extra setup required.
Pro It has a friendly welcoming community of builders
Cons
Con Private projects aren't free
The pricing plan looks too restrictive comparing to other Coding Cloud solutions.
Con No code prediction
