tresplayer is the official Atresmedia's app which lets you see all of Antena 3 and La Sexta's (Spanish TV Channels) content, including its shows, TV series, cartoons and other content.
Atresplayer's interface is elegant and simple, with all of the top content on the main cover and a drop-down menu on the left side that lets you quickly access the app's main categories. That way, if you're only interested in one show, you just have to go to the ‘shows’ section and look for whatever you want.
It's important to keep in mind that in order to play content on Atresplayer you'll have to be registered. The registration process is completely free and is done on the website or the app itself. It’s also important to know that, even though registration is free, some content (previous seasons, for example) are for pay.
Atresplayer is a good app for watching TV that works even better if you have a chromecast device handy, as it lets you send all of your content directly to the device’s screen. You can of course, still watch it on any Android device.