Update: Now on Android TV] There are two official NBC Sports apps
NBC Sports - Apps on Google Play
New NBC Sports Boston app features live streams of Celtics games
NBC Sports on the App Store
NBC Sports – Apps on Google Play
Watch NBC Sports: Clips, Videos, Highlights, Shows & More - NBC Sports
NBC Sports on the App Store
Fubo: Watch Live TV & Sports - Apps on Google Play
NBC Sports::Appstore for Android
NBC Sports on the App Store