Developers have said that it will be easy to build apps for different sized iOS devices, should Apple decide to launch a bigger iPhone or smaller iPad this year.

Piper Jaffray analyst Gene Munster asked 100 developers at last week’s Worldwide Developers Conference how they felt about the possibility of a 4in display for the next iPhone, and a 7in display on a new iPad 'mini'.

When asked how difficult it would be to make apps for the two new display sizes, on top of the current Apple devices, the average answer from developers was a difficulty level of just 3.4 out of 10. This indicates that developers will welcome the addition of new screen sizes in future iOS devices.

In a note to investors, Munster wrote: “Given the relative ease expected by developers for utilising potential new iOS screen sizes, we believe the introduction of new screen sizes would not affect the success or availability of the apps on iOS.”

Of the 100 developers questioned by Munster at WWDC, 55 said that they build apps for both iOS and Android, up from last year’s 47. Only 14 per cent said that they develop for Windows Phone, and less than ten per cent for BlackBerry devices, down a huge 36 per cent from 2011.

“iOS was the clear favourite in two categories: ease of development and future revenue growth,” wrote Munster. “We believe that Apple’s loyal developer base will continue to develop cutting edge apps for iOS that will draw in new customers, helping to fuel continued growth in iOS device sales.”

It is rumoured that Apple is planning to launch a 4in iPhone later this year, alongside its new mobile operating system, iOS 6.

[Via PCmag]