This paper proposes Web version of IntelligentBox called IntelligentBox for Web. Originally, IntelligentBox is “a Constructive Visual Software Development System for Interactive 3D Graphic Applications”, invented by Okada, el al. It was made for helping non-skilled users to develop interactive 3D graphics applications, particularly to create educational materials. IntelligentBox for Web provides equivalent functionalities of original IntelligentBox with much affordability for developing Web applications besides standard desktop applications. In IntelligentBox for Web, the authors used Reactive Programming for message passing of the communication among software components, and WebGL for displaying and interacting with 3D objects on a web-browser. Using Web technologies, users will not be bothered setting a development environment up when installing 3D graphics applications, and instead will only have to access a corresponding web page on a web-browser.