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About Pi Trainer

Always wanted to learn the decimal expansion of pi or any other real number by heart? This simple yet powerful app helps you memorize hundreds of digits in no time. Featuring amongst other things a timed mode to improve on your and your friends' high scores and a fully customizable keyboard.

Just remember, knowing the first thirty digits of pi is enough to calculate the volume of the observable universe accurate to the size of one hydrogen atom. So who needs to know more digits? You of course!

The app includes the following numbers by default:
- pi;
- tau;
- Euler's number e;
- the square root of two;
- the golden ratio φ.
You can also add your own numbers. If you have any suggestions for numbers that should be included by default, feel free to let me know.

There are multiple training modes available.
- Practice mode lets you type out the number, notifies you when you're wrong and shows the total amount of errors made. You can change the starting position to focus on a particular part of the number.
- Reference mode shows all digits of the selected number. Add spaces at regular intervals to organize the number visually, or specify the number of digits per line.
- Complete mode shows you some digits and asks you to type the digits that come after them.
- Timed mode lets you type the digits from the beginning of the number and measures the time until the first error. See how many digits you typed per minute and improve on your achievements on the highscores page.

The app includes an optional in-app-keyboard, as the Android number keyboard has another layout than the calculator you might be used to. The key ordering, width and height can be adjusted to fully match your needs.

Thanks to Julien Freslon for translating the app into French! If you want to translate the app into your language, please let me know by sending an email.

If you have any feature requests or want to report a bug, please let me know. You can email me at [email protected].

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Frequently Asked Questions(FAQ)

What does the Pi Trainer app help you do?

The Pi Trainer app helps you memorize the decimal expansion of pi or any other real number by heart.

What can you calculate accurately by knowing the first thirty digits of pi?

By knowing the first thirty digits of pi, you can calculate the volume of the observable universe accurate to the size of one hydrogen atom.

What numbers are included in the app by default?

The app includes pi, tau, Euler's number e, the square root of two, and the golden ratio φ.

What training modes are available in the app?

The app has multiple training modes including Practice mode, Reference mode, Complete mode, and Timed mode.

What does Practice mode in the app allow you to do?

Practice mode allows you to type out the number, notifies you when you're wrong, and shows the total amount of errors made.

What does Reference mode in the app show?

Reference mode shows all digits of the selected number and allows you to add spaces at regular intervals to organize the number visually.

What does Complete mode in the app do?

Complete mode shows you some digits and asks you to type the digits that come after them.

What does Timed mode in the app measure?

Timed mode lets you type the digits from the beginning of the number and measures the time until the first error. It also shows your typing speed in digits per minute.

What does the app include to match your needs?

The app includes an optional in-app-keyboard that can be adjusted in key ordering, width, and height to match your needs.

Who translated the app into French?

Julien Freslon translated the app into French.

How can you request a feature or report a bug in the app?

You can email the developer at [email protected] to request a feature or report a bug.
author
Excellent app , would be better if you could pay to get rid of adverts , the actual app is great for all numbers including your own !
David Holden
author
Great app. It also teaches you Euler's number, root 2, and the Golden Ratio. You can even import your own numbers.
Vermilisix
author
Almost perfect but I wish there was a way to remove times you arent happy with anymore to only display your best.
jaelly Cookie
author
Great app, the best I've tried. Lets you get away with a few typos and has a great complete sequence.
Aaron Diodati
author
My account namber and passward
M Shoaib Khan
author
Love it! Timed mode is awesome. Just now I typed 180 digits of pi from memory at 282.72 digits per minute. So cool! I definitely prefer the in-app keyboard over my android keyboard, and being able to fine tu...
Liqwid Sky