Code on the run

Google always appears to be one step ahead.

The free software, called Google App Inventor for Android (http://appinventor.googlelabs.com/about/), has been under development for a year. User testing has been done mainly in schools with groups that included sixth graders, high school girls, nursing students and university undergraduates who are not computer science majors.

The thinking behind the initiative, Google said, is that as cellphones increasingly become the computers that people rely on most, users should be able to make applications themselves.

“The goal is to enable people to become creators, not just consumers, in this mobile world,” said Harold Abelson, a computer scientist at the Massachusetts Institute of Technology, who is on sabbatical at Google and led the project.

The project is a further sign that Google is betting that its strategy of opening up its technology to all kinds of developers will eventually give it the upper hand in the smartphone software market. Its leading rival, Apple, takes a more tightly managed approach to application development for the iPhone, controlling the software and vetting the programs available.

“We could only have done this because Android’s architecture is so open,” Mr. Abelson said.