Taller Ninja

Train like a ninja.
Grow into your potential.

The honest habit app for teens: posture, exercise, food and sleep during puberty. Daily training, streaks and belts — from white to black.

You are a

Centimetres, or 5'11" — both work.

Free · nothing you type is saved · takes a minute

Google PlayGet it on Android iPhoneAndroid first, iOS later

A range, not a number

The mid-parental method — the one paediatricians actually use — puts a child's adult height inside a window of roughly 8.5 cm either side of a midpoint. That is the real precision of the science. It is not a rounding error we could design away.

So the app shows you the whole window, about seventeen centimetres wide, instead of one confident figure. A single number, or a percentage of accuracy, hides exactly the part you would want to know.

shorter your range · ±8.5 cm taller

Genetics set the window. Sleep, food and movement decide where inside it you land. Your growth plates close when they close — habits help you reach your range, not beat it. That is the whole honest version, and it is the same one the app gives you.

What the app looks like

The Dojo: today's training, habits and streakYour Dojo
A guided exercise with the pose drawn and a timerGuided training
The exercise library, each move with its own drawing100 exercises
Height logged over time against the estimated rangeYour growth
The Ninja Coach answering a question about habitsNinja Coach
Meal ideas and the nutrients behind themFood, not calories

Your daily training

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Posture & stretching

Guided exercises with built-in timers: wall posture, chin tucks, bar hangs and more. Standing tall is height you already own.

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Eat like you mean it

Meal ideas and the nutrients behind them — protein, calcium, vitamin D. No calorie counting, ever.

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Sleep is training too

Growth hormone is released in deep sleep. Fixed bedtimes, 8–10 hours, and a sleep posture setup.

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Track your growth

Log your height monthly and see it against the estimate doctors use — the mid-parental method, honestly explained.

And it keeps you coming back

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Ask the Ninja Coach

An AI coach for quick questions about posture, sleep, food or movement. Kept strictly on topic: no medical advice, no supplements, and never a promise in centimetres.

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A 30-day program

Every day a short guided training that builds on the last, showing each pose before its clock starts. Finish the thirty and it starts again, a little harder.

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Your week, every Sunday

A recap of the seven days: how much of your potential you used, your trainings, your belt and your latest measurement. Reminders that open exactly what they promise.

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Yours, and portable

Everything lives on your phone. An optional account backs up your progress so a new phone picks up where you left off. In English and Dutch.

Earn your black belt

Every training day earns XP. Keep your streak alive, unlock badges and climb the belt ladder.

White Yellow Orange Green Blue Brown Black 🥷

Why Taller Ninja is honest

  • No miracle claims — we tell you what works and what does not.
  • We never sell supplements or "growth" products.
  • Our height estimate uses the same method pediatricians use.
  • Your data stays on your device. No tracking, no ads.
  • The AI coach gives habit advice, never medical advice — and never promises centimetres.

Genetics set your range — sleep, food and movement decide whether you reach the top of it. Taller Ninja is not medical advice. Talk to a doctor if you have questions about your growth.