Yes, it needs Android 4.3 or earlier,
but yesterday I bought a new tablet, taking into consideration the Technical Specs mentioned (Android 4.3 or later and Bluetooth 4.0). I tried to download the app from the google play, and tells me “This app is incompatible with all of your devices.”
It is a Lenovo A80-50 A5500-H with Android 4.4.2 and Bluetooth v4.0