Bloomy launches AI mastery learning for K-12 — Socratic practice, then the tutor steps away for the test

Launched July 20, 2026 out of Y Combinator, Bloomy runs a three-stage mastery loop: instruction, Socratic AI-guided practice, and a 90%-to-advance assessment the AI tutor sits out, with Bayesian knowledge tracing routing students between skills. The founder reports a ~150-student charter-school pilot averaging 1.8x expected winter-to-spring growth on standardized measures — an encouraging but not causal signal, per the company itself. Family pricing is $19–39 per month, distributed through state education savings accounts.

What it means A concrete pedagogy architecture — tutor-restricted assessment and mastery gates — reaching real classrooms through education-savings-account distribution.