Evothings

I have just build an application that reads data from Nonin Oxymeter via BluetoothSerial. I have build as a standalone application by cordova for android platform. iOS wouldn't add on my Windows setup. Do I need a Mac for that?
Regards, Zdravko.

Yes, you would need OSX with Xcode and the iOS SDK, and an Apple Developer Licence (99 USD/year) to be able to install self-compiled apps onto your iOS devices and publish on the Apple App Store.

Are there then two mobile applications: one for iOS and the other for Android?

I'm not certain to what you're referring, but generally, if one wishes to publish an app, it must be built separately for each platform. Cordova helps by providing build scripts ("cordova compile") for most platforms.

I think I see. Single source, but two applications, one build on Mac for iOS, the rest built on anything. Thanks.