Check if app is iPhone opened on iPad

I have developed keyboard for iOS 8. Depending on if device is iPhone or iPad i load different layouts. Now, i have an issue when user opening app which is iPhone app but downloaded on iPad and of course iPad resizes this app. My keyboard detects device as an iPad and loads layout for iPad but as the app is not and iPad app, loaded keyboard layout is not suitable for it. Shortly, Is there any way to check programmatically if app is iPhone app resized by iPad? So i can load proper keyboard layout for it.