This is not just a one-day holiday event. From this day moving forward, SwiftKey won't be charging to allow users to customize their QWERTY keyboard using themes. This isn't the first time that SwiftKey has permanently stopped charging for a feature on its app. Prior to June 2014, SwiftKey had a free trial period and a premium service for Android users. The latter charged those who downloaded and installed the SwiftKey app. But the company then embraced the freemium model that allowed the keyboard to be installed for free, while in-app purchases allowed subscribers to customize their SwiftKey QWERTY. And starting today, those charges have been removed as well.

SwiftKey's customization themes are now free
source: SwiftKey
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