The solid SDK and attractive business model has lured many developers towards writing applications for the iPhone.  Today, Airplay has created a way for developers with a cost-effect way of creating applications for iPhone, Android, Symbian, Windows Mobile and BREW devices after only compiling their application once to native CPU instructions. Airplay takes care of the vagaries of the various underlying OSes so that developers need not be steeped in detail; it also deals with handset differences such as screen size and input type, again simplifying the task for the developer.

Developers with annual revenues of less than $50,000 can use Airplay SDK for iPhone development absolutely free, or deploy to all platforms at a cost of $99 per seat per year. Those with an annual turnover between $50,000 and $1m pay $999 per seat per year, and receive an increased level of support. For organisations earning over $1m annually, a per-application fee is payable, available on request. All developers can register and download a full free evaluation of Airplay SDK 4.0 by visiting www.airplaysdk.com.