Welcome to the Mobile Olympics.

Some of the official apps for phones and tablets are slicker and easier to use than their website counterparts. It's as though the app developers spent more time on them knowing that's where audiences are heading. Plus, apps can focus on doing fewer things well.

So if you have an iPhone, iPad or an Android device, check out these four free apps to follow the Winter Olympics in Sochi, Russia. Some of the apps are available for Windows Phone and BlackBerry phones as well.

Keep in mind that in the U.S., only the NBC Sports Live Extra app has any meaningful video of competition. But the others offer plenty for hardcore and casual fans alike.