There are some questions about whether Russia is actually ready for the 2014 Sochi Olympics. (Opening ceremonies are Friday.) But you can be prepared for the games by downloading a few apps in advance. Here are four to get you started.\n\tNBC Sports Live Extra\n\tNBC is the official Olympics broadcast network in the United States, so this is a must-have app for Olympics fans. It\u2019s free and available for Android and iOS.\n\tThe app lets you watch all Olympic events in their entirety, either as they\u2019re broadcast or after the fact \u2014 as long as you have a subscription to a cable, satellite or telco TV service. Logging into my Comcast service through the app was easy. But if you haven\u2019t yet set up online access to your pay-TV service, now\u2019s the time to do it.\n\tNBC\u2019s app sends you push notification reminders for events you don\u2019t want to miss. And it\u2019s not just an Olympics app. You can also watch other NBC sporting events, such as NHL games and the Golf Channel.\n\tThe app is far from perfect \u2014 many users complain about technical problems in their reviews. But as far as Olympic viewing apps go, it\u2019s the most complete.\n\tNBC Olympics Highlights\n\tDon\u2019t have a pay-TV subscription? This free Android and iOS app for U.S. viewers serves up video highlights as well as news and photos. Let\u2019s hope the developer (NBC Universal Inc.) gets around to updating the app\u2019s descriptions on the iTunes and Google Play stores, however \u2014 both still beckon you to \u201cfollow every event from London.\u201d Whoops.\n\tESPN SportsCenter\n\tESPN\u2019s iOS app\u00a0was just updated with a new Winter Olympics tab, which promises to keep you in the loop on event news, scores and medals awarded. ESPN\u2019s updated app also adds enhanced Twitter integration and iOS 7 improvements. As of this writing, however, the SportsCenter Android app has not been updated for the Olympics.\n\tSochi 2014 Medal Alert\n\tDeveloped by the International Olympic Committee, this free Android and iOS app does one thing: notifies you whenever a medal is awarded in your favorite sporting event and to the teams you follow. That\u2019s it. But if you want to stay updated and don\u2019t have much time to watch the events, that\u2019s plenty.