Designing a successful freemium product is hard. If users are happy with a free product, what incentive do they have to pay? And if users are not getting what they want, what will keep them from abandoning the product altogether? A well-designed upgrade prompt can be the key to engaging, and ultimately converting, users. Successful upgrade prompts are subtle enough to keep users hooked to the free service, while ensuring that the consideration to pay looms larger and larger with each interaction.
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