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No standalone child-billing. A student is never asked to pay to study. Depth is unlocked by a guardian or an institution, on one bill.
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No ads, ever. This is a minor surface. We don't advertise to students or sell their attention — that's a floor, not a feature.
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Transparent by default. The price list is public. There is no 'contact sales', no introductory rate that quietly rises, no lock-in.
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A real free tier. The free core is the actual product most students will use, not a teaser designed to frustrate you into paying.