90 seconds. Then the adult height. The thing they actually came for.
Estimate, not a doctor. $2.99/week unlocks the height. Cancel anytime.
Matching the family line…
WINDOW OPEN
Still room left.
Statistical estimate ± about 2 inches. Bone-age X-ray beats any quiz. Sleep and food decide the top of the range, not a new skeleton.
WINDOW OPEN
The adult height is ready. This is the part they came for.
$2.99 unlocks the exact height, the range, inches left, and tracking as they grow. Same price as a Gatorade.
Adult height. Range. Inches left. Then log new measurements and watch the prediction move as they grow.
Demo checkout on this phone. Tap unlock to test the reveal. Real Apple / Stripe billing is the next ship.
Adult height is mostly family math. We show the method because hiding it is how this category gets called a scam.
Typical band ±2 inches. If growth suddenly stops, see a doctor — not an app.