This app is a Asymptote file (asy..) viewer, editor for your browser.
It allows you to create and view Asymptote file directly on your browser and generate a HTML/PNG. 
You can easily view or edit your Asymptote file including vector graphics, drawing, plot, data.
This app lets you write, compile and preview Asymptote codes right on your browser.
It has a very straight forward user interface that can get you started in seconds.

Asymptote is a powerful descriptive vector graphics language that provides a natural coordinate-based framework for technical drawing.
Labels and equations are typeset with LaTeX, the de-facto standard for typesetting mathematics.