Zero friction is a constraint, not a feature

Every extra step between a person and the thing they came for is a tax, and students pay it in attention.

So in Qurricular every feature is on the free tier, the simulation pages need no account, and they are designed to be printed into textbooks as QR codes. Scan, and you are inside a physics lab.

I treat adoption friction the way an engineer treats a load limit: not something to optimize later, but a line the design is not allowed to cross.