Which mathematics subscription service was the first to reach 1 million paid users and pioneered the 'adaptive learning algorithm' that automatically adjusts problem difficulty based on user performance?

In the world of mathematics education, subscription models have revolutionized how students learn and practice. From premium problem sets to advanced visualization tools, these platforms have transformed the accessibility of mathematical learning. But how well do you know the history and impact of these digital math subscription services? Test your knowledge about the subscription model that changed how millions approach mathematics education!

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Brilliant.org (launched 2012)
Khan Academy Premium (launched 2018)
Wolfram Alpha Pro (launched 2009)
Mathway Premium (launched 2014)