PrepBox Math Studio
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A free math studio · from home · Grades 3–12

Math. Together.

Confident, motivated kids rub off on each other. That’s the part a worksheet can’t do. And yes — world-class instruction and content come with it.

Book your first session Speak with Min

The room, the content and the marking are free — none of them cost us anything per child. The one thing that does is explaining — step by step, right on your child’s page. That’s from $99 a month, and every child gets it free for their first two weeks.

Run by Min Lee20 years teaching math · U of T Math & CS
A table of kids
all working at once
Marked
every question, free
The right work
for where they are
A tutor
only if you want one

From her kitchen table into the Math Studio

  1. Her kitchen tableTuesday, 6:45
  2. One iPad, one pencilEvery line by hand
  3. And she’s in classHer classmates are already there
  4. Built like a studio, on purposeWhy we built it this way

Tonight's session

Forty-five minutes in the studio.

The same rhythm every time, so your child knows exactly what to do. And when they get stuck, Uni — the explainer we built into PrepBox — draws the next idea on their page.

No videos to sit through. She writes every line herself.

  • 1The real PrepBox app. Follow Ruby through one session.
  • 2Like a game, on purpose. Here’s why.
  • 3Characters, not cameras. Your child picks one; no faces, ever.

The real app screen · example students

Why a studio you can see

What catching it actually looks like.

Pencils moving either side of them, a cheer when someone gets it, and Min walking over to whoever has gone quiet. A video call throws all of that away.

On a video call

  • A grid of faces, the work out of sight
  • A stuck child waits, unnoticed
  • A camera on your child

In the Math Studio

  • Friends’ pencils moving, live
  • Cheers and tips from tablemates
  • A character instead of a camera

Ruby’s table, live

  1. Ruby’s table at work, pencils moving all around her.
  2. Ruby gets stuck on x + 2 = 18. Uni circles the + 2 on her page and asks, “What did you multiply by?”
  3. Ruby fixes the line herself, x + 6 = 18, and Maya cheers her on.
  4. Leo has been stuck a while, so Min comes over to help him.
  5. Kai watches a short lesson on the question Kai is on.

3.  Solve 3(x − 2) = 15

Something changed between line 1 and line 2. Can you find it?

Uni, PrepBox’s explainer, a small blue unicorn, asking a question

Meet Uni

Explanations your child can see.

A stuck child doesn’t wait for the teacher. Uni, the explainer we built into PrepBox, draws the idea right on their work.

Built from Min’s own teaching

Shaped by a year of Min’s recorded lessons.

  • It draws the idea

    Bar models, area models, algebra steps, on their own work.

  • It reads their handwriting

    Starts from the line they wrote. Math only.

  • The picture, never the answer

    One question, then the pencil goes back to them.

  • Min sees all of it

    When a picture isn’t enough, Min steps in.

It asks one question, then stops. The next step is still your child’s.

Uni isn’t a chatbot you can download. We built it for this studio. Free for the first two weeks, then part of a membership.

Min Lee
Min LeeRuns every session

The teacher

Whose class your child joins.

I’ve taught math for twenty years, to more than two thousand students. Great teaching matters, but I’ve learned it isn’t enough: kids sit up and engage when they’re with friends.

So I built PrepBox to teach a whole room the way I used to teach one student, with friends at the table and Uni explaining on every page while I go where I’m needed.

Min LeeFounder, PrepBox

  • 20 years teaching math
  • 2,000+ students
  • Math & CS, University of Toronto
Track record

They come back to say thank you.

Mike Woo

University of Toronto

99% in Calculus

B.S. Physics and Math

Olivia Nie

Harvard University

7/7 in IB Higher Level Math

A.B. in Government

Kasra Rahmani

University of Toronto

92% in Calculus

B.S. Comp Sci & Statistics

Sonia Sharma

Western University

96% in Calculus

Medicine

Kimberly Seaman

McGill University

99% in Calculus

B.S. Chemical Engineering

Esther Sohn

Georgetown University

95% in Calculus

B.S. Foreign Services

Maxim Barron

Wilfred Laurier University

91% in Calculus

B.S. Financial Mathematics

Andy Lee

University of Pennsylvania

100% in Calculus

B.S. Systems Engineering

Raymond Jang

Northwestern University

5/5 IB Higher Level Math

B.S. Physics

Lily — accepted to Ottawa University Medical School
Sam — 96% on Advanced Functions
YouTube comments praising PrepAnywhere videos
Yeeun — accepted to Waterloo BBA/Math Double Degree
Students thanking Min for Waterloo acceptance
Student accepted to UofT with Min reply
Student — 100% on unit test
Ashpan thanking PrepAnywhere
Noah Kim — 97 on exam
20years teaching
1,000+families
GlobalUS, Canada & worldwide

Parents' lounge

See how the session went, without the drive across town.

  • A call with Min every month, on a membership.
  • Watch their page fill in, live, in our free parent app, MathPulse.
  • A map of what’s solid and what comes next.

Most trouble with algebra starts two years earlier. This is how we find it.

Where the mark comes fromIllustration
SOLID Equality as balance FRAGILE Fraction operations THIS WEEK Linear equations NEXT Systems NEXT Slope
When algebra is hard, the cause is often an earlier idea. Illustration.

Plans

Everything but the tutor is free.

Every child sits in the same studio and gets their work marked. What a membership buys is a tutor — Uni on every page, or Min teaching them directly.

Everyone starts here

Open Math Studio

Your child works the right math for where they are, and every question gets marked.

Min’s roleKeeps the studio open

Freenothing is charged

Book your first session
  • The right work for where they are, every line by hand
  • Every question marked
  • A seat at the open table, at a set time each week
  • Classmates working beside them, lessons, math games and the progress they build up
  • The first two weeks, for everyone: Uni explains on their page whenever they’re stuck — the tutor, free, so you can see what it does before you pay for it.

When you want a tutor on it

Large Table

Your child works on their own math, with help drawn on their page.

Min’s roleRuns the room, comes when needed

$99a month, once the free two weeks are up

  • Uni keeps explaining, past the first two weeks
  • 1.5 hours a week: two 45-minute sessions
  • Help drawn on their page the moment they’re stuck
  • Min sees every page and checks in when needed
  • A call with Min every month
  • A table of classmates, and MathPulse for you
Book your first session

When your child needs a person teaching

Medium Table

Min explains, asks and checks their work, in a small group.

Min’s roleTeaches your child’s group

$145a month, for 1 hour a week

  • A small group: about five students with Min
  • Min works through problems with your child, directly
  • Uni helps only while Min is with someone else
  • A call with Min every month, and MathPulse for you

More hours a week: 2 h $225 · 3 h $330 · 4 h $385 · 6 h $499 a month

Ask for a Medium Table

Before you start

Your child needs an iPad and a stylus. We can lend them for a small deposit.

The practice, the marking and your report are free, and stay free. A membership buys a tutor, and nothing is charged unless you choose one.

Not sure which plan?

Tell Min about your child. Min will tell you honestly.

Book a call

Save your child a seat

Pick a time that suits you. The practice and the marking are free; the first two weeks include Uni as well.

Book your first session Ask for a Medium Table

Information desk

What parents ask.

Anything else, ask Min directly. Book a call.

Is it really free?

Yes. Your child works the right math for where they are, and every question is marked — that costs nothing, and it stays that way. What you pay for is a tutor: Uni explaining on their page every day, or Min teaching your child directly. Everyone gets Uni free for their first two weeks, so you can see what it does before you decide.

What does a membership add?

A tutor. $99 a month keeps Uni explaining on their page once the free two weeks are up, puts Min in the room, and adds a call with Min every month. From $145, Min teaches your child’s small group directly.

Does my child get Min’s attention in a group?

Yes, where it matters. Min sees every line as it’s written and goes to whoever needs a person; Uni keeps everyone else moving. It isn’t one-on-one. It’s a small class where nobody sits stuck.

Why not just use ChatGPT at home?

A chat app answers whatever it’s asked, usually with the answer. Here your child is in a class: a set time, friends working beside them, Min seeing every line, and explanations that stop before the answer.

Does Uni use AI?

Yes, underneath, to read handwriting and choose what to draw. But it isn’t a chat app: math only, drawn on your child’s page, shaped by Min’s lessons, and Min sees everything it shows.

Why does it look like a game?

Kids work harder when they can see friends working, and they come back to places that feel like theirs. What they do there is real math, by hand.

Which grades?

The open studio and the Large Table: Grades 3 to 8. Medium Table: Grades 3 to 12.

What do classmates see?

A first name and a character your child colours in. Never a face, a camera, a last name or marks.

What does my child need?

An iPad and a stylus. We can lend them for a small deposit.

There’s a free seat in the studio for your child.

Book your first session Speak with Min