Cortana

When Apple introduced Siri for iOS, it started a new trend that was previously shared by individual apps, but nothing system-wide. Google answered soon with Google Now, and while it didn't have Siri's finesse, it still did the job. For quite a while, it was between these two that the battle raged on, until Microsoft entered the foray with Cortana - a virtual assistant that in some ways was arguably better than both Siri and Google Now. After first launching on Windows Phone and then later on Windows 10, Microsoft committed to bring Cortana to iOS and Android, and back in July, a leaked APK became available that gave users hope. Today, however, Microsoft has released an official beta version of Cortana for Android, and it's available for you to download and test away right now.