Microsoft Cortana for Android now available via Google Play Store in public beta (US only)
Of course, Android already has Google Now, which is a great digital personal assistant, but it looks like plenty of Android (and even iOS) users are willing to try Cortana anyway. Unlike Google Now, Cortana relies on Microsoft's Bing search engine, so it delivers different results (at least in some cases). Like a good personal assistant, Cortana also enables you to set reminders and alarms, place calls, send texts, and so on.
You can download Cortana for Android from Google Play via the first source link below. Note that you need to agree to some terms and conditions in order to become "a tester" before being able to actually download the app. You should be able to install Cortana on most devices running Android 4.0 or later. However, since the app is still in beta, it may not play nice with all Android phones or tablets out there.
source: Google Play Store, Microsoft