According to a new report from mobile technology company Fiksu, the iPhone 5 caused app downloads to grow by 33 percent in the weeks following its Sept. 21 launch.The Fiksu App Store Competitive Index, the company’s tool that measures the average aggregate daily download volume of the top 200 free U.S. iPhone apps, saw 4.07 million daily downloads in September.

According to the report, the cost to acquire a loyal app user dropped by 16 percent in September. The Fiksu Cost per Loyal User Index was $1.13 in September, down 21 cents or 16 percent, from August’s $1.34.

“A new device launch always presents an opportunity to cost-effectively acquire and engage new loyal users – and marketers are starting to anticipate this,” said Micah Adler, CEO, Fiksu in a statement.