Christmas Day is a huge day of the year for app developers, one developer in particular, Storm8, racked up two million downloads that day.

As analytics company Flurry reported today, Christmas Day as well as the week from Christmas Day to New Year’s Day was big for app developers. Flurry reported 17.4 million device activations and 328 million app downloads on Christmas Day alone, and 50 million device activations and 1.76 million app downloads from Christmas to New Year’s.

The Redwood Shores, Calif.-based Storm8 claimed that it saw downloads increase fourfold on Christmas Day when compared to a normal Tuesday. The company also saw 2.5 million hours of gameplay and up to 4.5 times higher average revenue per daily active user (ARPDAU) on the same day.

Storm8, which has been bootstrapped up to this point, offered some tips on how to increase an app’s presence during Christmas. First, Storm8 said app developers should be prepared for the high amount of new device activations, and second, offer holiday-themed content to increase revenue. Trademob CEO Ravi Kamran recently wrote a guest post for us on this very subject of how to market an app during the holiday season.