Viggle, a social TV start-up, has celebrated its first birthday by revealing it has 493,475 monthly active Vigglers in the US who have collectively checked-in 151m times. The service has 1.8m registered users.

Viggle automatically identifies what TV show is being viewed and gives users points for every minute watched. They can find out which programmes will give them extra points, set show reminders and get detailed information for live and DVRd content from more than 170 channels.

The free app rewards couch potatoes with coupons from different household brands. Users get more points during a broadcast if they take part in interactive questions, polls and voting related to what’s happening on-screen.

Viggle, available in the App Store or on Google Play, more than doubled its monthly active users from 233,607 in October 2012 to 493,475 in January 2013. Viggle had its biggest day yet on 13 January, with nearly 870,000 verified audio check-ins. Viggle has worked with more than 40 leading brands so far, including Mercedes-Benz, Burger King and Pepsi, giving away 1.3m individual rewards.

The company is owned by American media mogul, Robert F.X. Sillerman. He is offering users the chance to spend his 65th birthday with him as a prize for Viggle’s birthday.