Which mathematics software company pioneered the 'freemium' pricing model for graphing calculators, offering basic functions for free while charging for advanced features?

In the world of mathematics education and publishing, pricing strategies have evolved significantly over time. From traditional textbooks to digital learning platforms, companies have employed various approaches to price their educational products. This trivia question focuses on a groundbreaking pricing innovation that changed how students access mathematical learning tools.

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Desmos
Wolfram Alpha
GeoGebra
Maplesoft