Fiksu is out with new data confirming what was largely anticipated — the tremendous impact of Apple’s iPhone 6 and iOS 8 on the cost of marketing new apps.

September was a particularly expensive month for marketers looking to reel in or retain loyal app users.

“Reaching an all-time high in September, the Cost Per Loyal User Index increased 21 percent to $2.25, representing a 34 percent rise year-over-year,” Fiksu reports. “This new high-water mark reflects the enduring trend of increasing activity and competition to capture loyal, engaged app users.”

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Fiksu says the accelerated global adoption of Apple’s iPhone 6 sparked a wave of activity, driving 116 percent higher adoption than Apple’s last iPhone.

To review the complete report from Fiksu, click here.