Reddit purchased third-party client Alien Blue in 2014. This past Spring, Reddit launched its first official client. Many of Alien Blue's features found their way into the official client. However, one notable exception was iPad support. As a result, Alien Blue for iPad remained on the App Store and, in fact, is still there.
Today, Reddit updated its official client to support the iPad. The UI of the iPad version is the same as the iPhone version, but with margins added to the left and right sides of the screen to avoid it looking like the content is stretched out. As a result there is a lot of white space if you use the app in landscape mode. I would have preferred to see a more creative use of the iPad’s added screen real estate, but the update is still better than using the scaled-up version of the iPhone app.