The debate kicks off at 9PM ET tonight at Hofstra University, and will run for a commercial-free 90 minutes. Here's a rundown of where to watch.
Facebook, Twitter, and YouTube
Several web services cut deals this year with traditional broadcasters to bring the debate online, so you have a range of options in how you want to tune in.
Facebook will be broadcasting ABC News' coverage of the event through Facebook Live, and you can expect to see other organizations making their coverage available there as well.
Twitter has similarly partnered with Bloomberg TV for full coverage of the debates, and will make the stream available at debates.twitter.com.
One more option: YouTube, which will provide live-streaming coverage from multiple news organizations. That list includes NBC News, PBS, Fox News, The Washington Post, Bloomberg, and Telemundo, according to the service.
Other streaming options
If, for some reason, you'd prefer another service, you won't have too hard of a time finding a way to watch. Several news organizations have promised to carry live streams of the debate on their websites. Those sites include The New York Times, The Wall Street Journal, Politico, BuzzFeed, CNN, and The Huffington Post.