Galton Board

Galton Board

Probability theory simulator

44 ratings
5 reviews
Free

Details

Released
September 5, 2018
Updated
October 31, 2026

Features

Galton Board screenshot #1 for iPhone
Galton Board screenshot #2 for iPhone
iphone
ipad
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About

Explore probability theory with a simulation of the classic Galton board. Adjust board size and send numerous balls through a pin maze to observe emergent patterns visualized in a bar chart. Ideal for educational purposes, it demonstrates concepts related to Pascal's Triangle and binomial distributions.

✓Galton board simulation
✓Adjustable board size
✓Simultaneous simulations on iPad
✓Bar chart visualization
✓Educational tool for probability
✓Demonstrates Pascal's Triangle relation
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+1

What's New in Galton Board

2.3

October 31, 2026

Added support for iPhone Duo.

User reviews

Excellent Galton Board App

This app is fun to use because you can vary the number of rows and the number of beads. I especially like seeing the exact number of beads in each bin so I can look at the statistical variation from cycle to cycle. I would like to see a repeat button added so I would not have to reenter the number of beads every time. Having a 1000 bead button would also be convenient for running a many bead simulation. The app seems to produce the Pascal’s triangle bead bin probabilities very well. The random number generator appears to have a random offset so each run of the app produces different results. Would you comment on the random number generator you use? Great app! Thank you!
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Please fix the math! It’s misprogrammed but love the idea!

I want to give this app five stars, but after 20 trials, it’s incredibly clear that it has been misprogrammed. for example, you will always see a higher number than expected of balls on the outside, which should average out to 1/8, 1/16, 1/32, 1/64 depending on how many rows.

Response from developer

Hi Dan, thank you for bringing this to my attention. I was able to reproduce the issue, and it has been resolved in the latest release. - Edwin

Very nice

Good representation of the theory.

Love this app!!

This app is so simple and easy to use. It’s fun. My only suggestion is if stationary at the bottom of each of the columns if there would also be a percentage (00.00%) of the total.

Tedious gimmick

Why in the world wasn't this app written so we can EASILY enter ANY NUMBER?

Response from developer

Hi tabaks, thanks for your feedback. In the next release, you can tap the top number to manually enter any amount.

Developer apps

FAQ

What is the Galton Board app?

The Galton Board app is a simulation of the famous Galton board, designed for educational purposes. It allows users to explore probability theory by observing how balls fall through a maze of pins and form a distribution pattern.

How does the Galton Board app help with learning?

It helps users grasp chance and probability concepts by visually demonstrating how random events lead to predictable patterns, similar to Pascal's Triangle and binomial distributions. Users can adjust parameters to see how they affect the outcome.

Can I run multiple simulations at once in the Galton Board app?

Yes, on iPad devices, the Galton Board app supports running multiple simulations simultaneously using multiple windows. This feature enhances the ability to compare different experimental setups.

What kind of results does the Galton Board app show?

The app visualizes the results of the simulations using a bar chart. This chart clearly displays the distribution of the balls after they have traversed the board, making the statistical outcome easy to understand.

Is the Galton Board app suitable for all ages?

The Galton Board app has an age rating of 4+, making it suitable for a wide range of users. Its educational nature is beneficial for students learning about probability and statistics.

How often is the Galton Board app updated?

The latest version of the Galton Board app is 2.3, which was last updated on October 31, 2026. This indicates a commitment to maintaining and improving the application.

Does the Galton Board app have ads?

No, the Galton Board app is ad-free. It is a free application without any advertisements, allowing for an uninterrupted educational experience.

What devices are supported by the Galton Board app?

The Galton Board app is available on both iPhone and iPad devices. This broad compatibility ensures that many users can access this educational tool.