A lot is resting on the new OS after its predecessor Windows 8 was heavily criticized. However, mobile app developers are unconvinced that Windows 10 will be worth their time, given Window's tiny market share in the OS smartphone space.
"Nobody is asking for a Windows app and that's due to the market size alone," Andreas Rasmussen, managing partner at mobile development company Nodes, told CNBC by phone.
According to market research company IDC, Windows owns 3.2 percent of the OS market share for smartphones, compared to 79.4 percent for Android and 16.4 percent for iOS.
As a result developers can find it difficult to monetize their products.