The IOS app Double Dog is the only app in existence that is similar the app around which the movie Nerve revolves. Users can send and watch others do dares as well as do dares themselves for cash and other prizes.
The developers of Double Dog are starting a Kickstarter campaign to fund development of an Android version of the app. The campaign ends on July 1, 2016. The prizes include t-shirts, in-app currency, and tickets to Nerve.
Link to Kickstarter page: