iOS 10 may have only reached roughly half of iPhones and iPads so far, but developers who readied their mobile apps for the new iMessage App Store are already benefitting, a new study finds.

Existing apps that added support for iMessage have seen their downloads increase significantly, with early movers like JibJab seeing the largest download growth.

With iOS 10, iMessage expanded beyond simple messaging to also become a platform for apps, which includes having its own App Store.

Today, new sticker packs and games are dominating the iMessage App Store s top charts, but pre-existing apps have also seen sizable download growth by rolling out their own support for iMessage interoperability.

According to data from app intelligence firm Sensor Tower, the animated sticker-making app JibJab, whose app has been on the iOS App Store since 2014, saw incredible growth following the launch of iOS 10.

Its download growth was over 1,500% for the week of September 12th – the first week iOS 10 became available to the public for download, the firm found.

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