You can also install the app on any device running Android 4.4 KitKat, Here’s how to do that.
First make sure that you have the latest version of the Google Search app (22.214.171.1249776) installed on your device. If not, update it from the Play Store app on your device.
In case, you don’t have the Search app installed, just hit the widget below to download it.
That’s it, you are done.
The launcher acts as a stub app, and uses Google Now for its homescreen. That’s how you get the Google Now Cards when you swipe towards the right.
I tried the “Ok Google” hotword on my Moto G and it works flawlessly.