Which mathematics learning platform was the first to reach 1 million paid subscribers with its 'Premium' subscription model that offered advanced problem-solving tools?

Mathematics education has been transformed by digital subscription models over the past decade. Different platforms have pioneered various approaches to monetizing math learning, from freemium models to premium subscriptions. This poll tests your knowledge about a significant milestone in mathematics education subscription history that changed how people access and engage with mathematical learning resources.

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Khan Academy Plus (launched 2017)
Brilliant.org (launched 2012)
Mathway Premium (launched 2015)
Symbolab Pro (launched 2016)