Instead of Principia
Principia alternatives
Apps that do what Principia does, from the math learning apps list, the ones you can start free with first.
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Interactive Primer
Free plan Web - 4
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BrainTrail
Free plan Web - 7
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AdaptiveMath
Free plan Web - 9
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Synthesis Tutor
Free plan AndroidiPhoneWeb - 14
My Math Academy
Free plan AndroidiPhoneWeb7.1 Visit site - 15
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Asobo
Free plan Web - 20
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Zearn Math
Free plan Web - 22
Teachley
Free plan iPhoneWeb - 23
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Mathsframe
Free plan AndroidiPhoneWeb