Windows 10 has many universal apps like Music, Video, Photos People Hub and Maps and these will be present on all Windows 10 SKUs including Windows 10 for Phones. Add the Windows 10 Desktop alarms app to this list. It is an universal app too and will come to Windows 10 for phones. The above screenshot shows the Windows 10 Desktop alarms app in a smaller window. This has been confirmed by Gabriel Aul from Microsoft.
@LuigiLaera We’ll be bringing the Windows10 Alarms app to phones. As a Universal App, the same code will run on both platforms.
— Gabriel Aul (@GabeAul) February 3, 2015