Mobile software developers remain fixated on Apple and on Google's Android as the prime targets of their toil, but Microsoft and Research In Motion are making inroads as tablet offerings multiply.
The iPhone, which boasts more than 300,000 third-party applications, or apps, retains the attention of 92 percent of developers, according to a survey released on Tuesday by research firm IDC and app platform Appcelerator.
The survey of more than 2,200 developers found many expect to produce more apps for more platforms with more complexity.
"Cloud connectivity, location and social will define the experiences of most applications this year and going forward," said Appcelerator's Scott Schwarzhoff in an interview.
"Respondents said 'last year I was kicking the tyres, this year I really am ramping up my efforts'," he added.
Developer intent is a useful indicator of broader interest in a platform, as consumers are drawn to devices that can perform specific tasks such as checking news or stock prices, tracking how far you've run or finding nearby restaurants.
Apple's iPad tablet and Android phones -- which are made by a number of handset makers including HTC , Samsung and Motorola Mobility -- tied for the next biggest share of developer attention, with 87 percent saying they are very interested in each platform.