The apps -- a live-streaming app for the more than 3,500 hours of expected Olympics content and a companion app loaded with additional content -- are on Apple's App Store and on Google Play, CNET.com reported Thursday.
The NBC Olympics Live Extra app will stream all 32 athletic competitions and the awarding of all 302 medals, while the NBC Olympics app will provide interviews, news stories, highlight videos and live results.
"NBC Olympics Live Extra puts the London Olympic Games into the hands of America's tablet and smartphone user, enabling us to once again use advances in technology to provide the broadest possible access to the thousands of hours of Olympic competition," NBC Olympics President Gary Zenkel said in a statement.
The apps, which will carry some ads in addition to the Olympic content, can be customized based on interests, Adobe's Jeremy Helfland said, so instead of viewing a single feed that moves from event to event, a user can watch a stream dedicated to a specific event.
Mobile device owners looking to stream the Olympics coverage with the apps must be pay-TV subscribers, as only customers who have a cable or satellite subscription will get full access, NBC said.
Users will be asked to sign in with their cable or satellite login to watch.