Hello fellow developers!

I know this is devRant, but I don't know of a better community with such diversity of developers like you guys and I need your input.

I decided to go on a language journey. I come from a background of php/javascript and feel the need to expand my horizons.

I'm going to write the same app in each language to get the feel of it and become familiar with the syntax and language concepts.

Since I'm a web developer I'll focus mainly on languages used on the web like: Java, Python, Ruby, etc.. But I want to cover others as well, like Objective-C/Swift, C++/C#.

I'm having trouble figuring out what kind of an app would cover most of the ground. I know the basic guideline for this is a TODO app for web frameworks, but I
don't feel like writing a TODO in Swift or C# really cover what the languages are intended for.

I don't know enough about the environments yet to come up with a good idea.

I want something, that can be language independent but would utilize the power of each language in one part or another and is still simple enough not to require weeks of development.

Does anyone have a brilliant idea what that could be?