CNN.com: the site usually requires viewers to authenticate a cable login after 10 minutes of streaming, but tonight's debate will be free to watch in its entirety
NYTimes.com: New York Times national editor Marc Lacey will join CNN's Anderson Cooper and Erin Burnett to moderate tonight's debate. The newspaper will also carry a livestream on its site.
Mobile: Both iPhone and Android users can stream the debate live on either CNN or The New York Times' mobile apps.
Streaming apps: The CNNgo app, which will carry the debate, is also available on Apple TV, Roku, Amazon Fire, Chromecast and Android TV. According to CNET, viewers can also tune in to CNN international using Hulu Live TV and FuboTV.
Audio is an option, too: If you prefer to listen, tune into 95.5 WSB or try the 95.5 WSB Radio App.
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The debate will be held at Otterbein University in Ohio — a notable swing state, which President Donald Trump won in 2016.
Who qualified? Joe Biden, Cory Booker, Pete Buttigieg, Julián Castro, Tulsi Gabbard, Kamala Harris, Amy Klobuchar, Beto O'Rourke, Bernie Sanders, Tom Steyer, Elizabeth Warren and Andrew Yang.