Which mathematical subscription service first introduced adaptive learning algorithms that personalize content difficulty based on individual user performance metrics?

The intersection of mathematics and retail has led to innovative subscription models for mathematical learning tools and resources. These services have revolutionized how students, educators, and professionals access mathematical content. This poll tests your knowledge about a pioneering subscription model that changed how mathematics resources are consumed in educational settings.

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Brilliant.org, which launched its adaptive pathway system in 2015
MathCircle, which introduced dynamic difficulty adjustment in 2017
Wolfram Alpha Pro, which implemented performance-based content delivery in 2016
Khan Academy Plus, which pioneered personalized math sequences in 2018