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AI reading and math tutor

A storybook that learns to read with your child

Every week, a trip across Latin America: a story written for your child with the words they can already read, a mission at home and a stamp in their passport.

Request an invite How it works
  • Ages 4 to 10
  • In Spanish
  • One hour a day at most

Our take on Y Combinator’s request for “The Primer”, built for Spanish-speaking families in Latin America.

One week in each country

Monday to Saturday, with a stamp at the end.

  1. Guatemalavolcanoes and quetzals

  2. Mexicopyramids and butterflies

  3. Perustones, knots and llamas

  4. Chilemoai and stars

How it works

A book, an adult beside them and a passport

It lives on a screen, but it is used like a paper book: someone sitting alongside, pencils at hand and a conversation afterwards.

  1. For your child

    A book written for the one reading it

    Each day opens a few pages of the trip. The story uses the words your child can already read: they read the yellow ones alone, you read the rest. When they learn a new letter, the book starts using it.

    • Math challenges hidden in the story: counting volcanic stones, continuing a Mayan weaving pattern.
    • When it’s time to imagine or create, they draw by hand on paper and you take a photo of the paper.
    A page from the Guatemala trip, in Spanish: a Mayan weaving with a row of diamonds and squares and the question “What comes after the last diamond?” with three options. Below, the “Para ti” strip for the adult: if they hesitate, read the row aloud with rhythm; don’t say which one comes next.
    A page from the Guatemala trip, with the “Para ti” (for you) strip at the bottom.

  2. For you, the adult

    You sit beside them, with a guide on every page

    Nothing to prepare. Before opening the book you see what they will learn today and what your part is, in two minutes. On every page a “Para ti” strip tells you how to help without giving the answer away.

    • You mark what they read and what they can’t yet, and the book adjusts what comes next.
    • The book closes after one hour in a day. You can lower that limit.
    The adult’s “Today” screen, in Spanish: time today, 0 of 60 minutes; what they will learn (words with m, l, p and s, adding up to 8, and why volcanoes smoke); and your part: sit beside them and let them read the yellow words without help.
    The adult area. “Pino” is a sample family.

  3. For the whole home

    A mission at home and a stamp in the passport

    At the end of the week there is a mission with things you have at home (in Guatemala, making a huipil out of an old T-shirt), and your child presents the trip to the family. Then the country’s stamp goes into their passport, which you can print.

    The open passport, in Spanish: on the left, Guatemala’s green stamp, dated October 20, 2026, for a mission with recycled materials; on the right, the outline of Mexico’s stamp, the next destination.
    The passport, with the first stamp in.
What you won’t find
  • Streaks
  • Prizes or points
  • Comparisons with other kids
  • More than an hour a day

AI, with limits

What the AI does, and what it doesn’t

The AI writes; it never talks with your child. Everything it writes goes through rules before it reaches the book.

What it does

  • Writes the story before the sessionWith the week’s country, your child’s interests and level. When they open the book, the page is already written.
  • Uses the letters they already knowEvery story is checked against those letters: only words they can read are highlighted in yellow.
  • Goes through you firstIn the pilot, the adult reads each story before the child does.

What it doesn’t

  • No chatting with your childThere is no chat with the AI. Your child reads, counts, draws and talks with you.
  • No face, no voiceNothing is recorded. Photos are of the paper drawing, and only reach the AI if you allow it.
  • No open-ended spendingThere is a spending cap per family. If it’s reached, the AI pauses.

Privacy

Privacy, in plain words

Only what’s needed

You sign in with your email. No phone number, no one’s real name: your child gets a nickname.

The nickname never reaches the AI

The AI gets age, letters, interests and what happens in the book. Never the nickname, name, school or where you live.

Photos of paper, not people

Drawings are made by hand and you photograph them. Only if you allow it, a small copy goes to the AI to suggest a question.

Delete everything

What happens in the book is kept for your family and only visible with your account. You can delete it all at any time.

Full privacy policy: coming soon. Questions in the meantime: hola@kbros.ai.

Who we are

There are four of us

Leonardo, Gabriela, Andy and Teresa. Gabriela, Leonardo and Teresa have known each other since university, more than 20 years ago. Before Kbros, we built digital products and helped grow companies.

Want to talk? Write to hola@kbros.ai.

  • Leonardo
  • Gabriela
  • Andy
  • Teresa

Pilot

Request an invite

We are opening Kbros · Viajes slowly, to a few families. Leave your email and your child’s age, and we’ll write when there’s a spot.

We don’t ask for your child’s name. We only use your email to write to you about Kbros. The book itself is in Spanish.

More than one child? Pick one age; tell us the rest later.