Apple TV just got more interesting.
The tech giant announced that the HBO GO and WatchESPN applications are now available on its Apple TV platform. However, to use both apps on the Apple TV platform, users must already have a subscription to the services via their cable service provider.
(Read More: Apple to Release Several 'Game Changers': Cook )
HBO GO and WatchESPN were already available for iPhones and iPads. The move to Apple's set-top box is significant because it makes the device more competitive with other Internet-connected set-top boxes like Roku and Microsoft's Xbox 360.
(Read More: Apple Is Building Something Bigger Than a TV)
Apps like Netflix, Hulu, YouTube, flickr, NBA and the MLB.TV app also are already available on the platform. Unlike the apps available in Apple's app store, the ones on the TV platform are selected by Apple. However, there is speculation that Apple may soon open up the platform for developers so that anyone can build an app for the device. Apple, though, would still have to approve the application, as it does for any apps in its App store.
Apple TV is an Internet-connected device for televisions. Apple is expected to eventually roll out an actual TV set sometime next year.
(Read More: Apple's Next 'Wild Card' May Not Be What You Think )
—By CNBC's Cadie Thompson. Follow her on Twitter @CadieThompson.