Math tutor · Grades 3–5
Blu teaches a full grade of math in about 30 hours*, one small step at a time, so kids spend less time stuck and more time on everything else.
*Median projected time to work through a full grade, from our Alpha School pilot.
Try the Fold Lab
The fold line has to cross the shape. Drag it back over the paper!
Turn the dashed line by its round handles, then drag the paper across it to fold. The square has 4 lines of symmetry. Can you find them?
Try each one. Use the arrows to see the next.
Blu reads every answer, works out the thinking behind it, and teaches the next step. Try a wrong answer on purpose.
BluType an answer and press Check. Get it wrong on purpose and see what happens.
When a kid is stuck, Blu opens a short worksheet and teaches one small step at a time, reacting to each answer until they’re ready to go back to the lesson.
First, how many equal pieces is the whole bar cut into?
BluLet’s take this one small step at a time.
Short daily sprints make math facts automatic, so a kid’s working memory goes to the new idea instead of to 7 × 8.
Ready?
Two small experiments on how kids learn, and why Blu teaches the way it does.
Drag the line through a month. Each review makes a memory fade more slowly, so the next review can wait longer: 1 day, then 2, then 4, then a week.
Day 10: learned once, 8% is left. With spaced reviews, 91% is still there.
Illustration from a simple forgetting-curve model, not measured Blu data. Real memory varies from kid to kid.
Ebbinghaus (1885), “Memory: A Contribution to Experimental Psychology.” Cepeda et al. (2006), “Distributed practice in verbal recall tasks.”
Each row is a grade, earliest at the top, and every skill rests on the ones above it. Tap a skill to put a gap in it, and watch what breaks below.
Tap any skill to put a gap in it.
A simplified map of a few grade-school skills, not Blu’s full curriculum.
Siegler et al. (2012), “Early predictors of high school mathematics achievement.” Duncan et al. (2007), “School readiness and later achievement.”
Companions
Kids collect companions that grow when their math does. This is Coraltrunk, one of Blu’s starter pets. Get a question right and it evolves.
“A gentle elephant made of flowing water, with coral tusks and kelp ears. Sprays a celebratory fountain on every level up!”
Question 1 of 27 × 8
Every right answer helps Coraltrunk grow.
For parents
30hours
Median projected time to work through a full grade of math, from our Alpha School pilot.
2 grades in 5 months, or your money back.
“The first math practice my child doesn’t avoid.”
Adaptive daily lessons, misconception detection and repair, a personalized lesson path, parent progress visibility, and expert-backed curriculum guidance.
Everything in Monthly, plus a private parent community, a parent strategy call, expanded parent reports, founding family events, and early access to new features.
