By: Kevin Gallagher @ Business Insider

Over-the-top (OTT) platforms are increasing their spend on national TV commercials, according to iSpot.tv. In 2017, the average US adult spent just under four hours per day watching TV, more than three times the amount of time spent on digital video, so it makes sense that OTT platforms are flocking to TV to win over subscribers.

Amazon Prime Video edges over Netflix. The e-commerce giant spent $55 million on TV ads, up 74% from 2016. Meanwhile, rival Netflix spent just over $42 million, up 33% from 2016, per iSpot.tv.