What is the difference between the free and "pro" versions?

The pro version is equivalent to the free version with the in-app upgrade. Some of our users expressed an interest in a pay-up-front version so they could give the app as a gift, which can’t be done with an in-app purchase. Also, Apple's app bundles can only include paid apps, not free apps with in-app purchases. Most of our users prefer being able to try the free version before upgrading to receive the premium features.

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