Which mathematics learning platform famously increased its user base by 500% after switching from a one-time purchase model to a monthly subscription model in 2016?

The mathematics education industry has undergone significant transformation with the rise of subscription-based learning platforms. These services have changed how students access mathematical knowledge, offering everything from basic arithmetic to advanced calculus through recurring payment models. This poll tests your knowledge about one of the most impactful subscription model pivots in mathematics education history.

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Brilliant.org
Khan Academy (which actually remained free but introduced a premium subscription tier)
Wolfram Alpha Pro
Mathway Premium