Which of these mathematics learning platforms first pioneered the 'freemium' subscription model that became widely adopted across the educational technology sector?

The digital age has transformed how mathematical resources are accessed and distributed. Subscription models have revolutionized how students, educators, and professionals engage with mathematical content. From problem-solving platforms to advanced computational tools, mathematics subscription services have created new paradigms for learning and practicing mathematics. Test your knowledge about the evolution of these innovative business models in the mathematics industry!

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Brilliant.org (launched 2012)
Wolfram Alpha Pro (launched 2009)
Mathway (launched 2008)
Desmos Premium (launched 2015)