I am using this application since I started programming. The app has a good layout and design. It has a good user interface. It also takes less space. You can learn as well as code using this app. There are many languages available to learn such as c, c+ , java, python etc.
The main thing that I liked in this app is the compiler. The program doesnt take take time to run the code. The debugging is well defined and we can easily find errors. We should take inputs on separate lines if multiple inputs are needed. The theory for each language is short but sufficient to understand the basics of every language.
So if you are a programmer or coder you must have this app installed in your phone.