Which mathematics subscription platform pioneered the 'micro-lesson' approach that revolutionized K-12 math education and reached 1 million subscribers within its first 3 years?

The mathematics education landscape has been transformed by subscription-based learning platforms. These services have changed how students access mathematical content, how educators supplement their teaching, and how professionals maintain their quantitative skills. This poll tests your knowledge of the subscription model's impact on mathematics education and resources.

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MathBoost (founded 2015, featuring gamified problem sets with dynamic difficulty adjustment)
NumberCrunch (founded 2016, featuring 3-5 minute targeted concept explanations with visual animations)
AlgebraAce (founded 2014, featuring personalized practice problem generation based on error patterns)
CalculusQuest (founded 2017, featuring expert video walkthroughs of advanced mathematics topics)