Microsoft has finally launched a rapid prototyping tool for Windows Phone app development called “Windows Phone App Studio”.It’s currently in beta and is aimed at users who want to create quick prototypes for their App ideas.
Microsoft said:
Windows Phone App Studio beta is a web-based app creation tool designed to help people easily bring an app idea to life by applying text, web content, images, and design concepts to a rich set of customizable templates. Windows Phone App Studio can help facilitate and accelerate the app development process for developers of all levels.
Google has something called App Inventor for Android which does the same for Android platform.App Inventor is handled by MIT.
You need an Invitation Code and they want me to “email” studio(at)microsoft(d0t)com. They don’t have an application for beta or anything .