For many application developers, the problem lies with Android Market, the main download portal for apps.

"People complain about Apple where you have restrictions and it takes a while for things to be reviewed," said Chris McClelland, director of Ecliptic Labs, a mobile app developer based in Belfast.

"I think on one hand it's quite a good thing - one focused source, and you get feedback that's very useful for your app. It's quality control."

The Android Market needs to become that focused source, he says.

"Android is very popular with developers. It's got a lower barrier to entry, easier learning curve, and excellent tools, but app developers find making money on the Android platform more difficult."