## Basic Information

50+

Thousand

Installs

PREMIUM

Recent installs

4.44

375

Rating

Unranked

Ranking

1

Libraries

2.1+

Android version

5/1/14

Last updated

2011

June

App Age

1.11 MB

App size

Everyone

Content Rating

FREE

Price

### Google Play Rating history and histogram

263

58

26

12

16

### Changelog

- Oct 12, 2017 Installs 50,000+ installs
- May 1, 2014 Update Version 1.1
- Jan 25, 2014 Update Version 1.0.8
- Nov 6, 2013 Update Version 1.0.7
- Apr 28, 2012 Installs 10,000+ installs
- Feb 16, 2012 Update Version 1.0.6
- Dec 5, 2011 Installs 5,000+ installs
- Oct 21, 2011 Update Version 1.0.5
- Jul 16, 2011 Update Version 1.0.4
- Jul 13, 2011 Installs 1,000+ installs
- Jul 1, 2011 Installs 500+ installs
- Jul 1, 2011 Update Version 1.0.3
- Jun 29, 2011 Update Version 1.0.2
- Jun 21, 2011 Installs 100+ installs
- Jun 20, 2011 Update Version 1.0.1
- Jun 18, 2011 Installs 50+ installs
- Jun 16, 2011 New App Version 1.0 in Tools for Free

### Developer information

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I'm the developer of this app
## Description

RealPi provides some of the best and most interesting Pi calculation algorithms out there. This app is a benchmark which tests your Android device's CPU and memory performance. It calculates the value of Pi to the number of decimal places you specify. You can view and search for patterns in the resulting digits to find your birthday in Pi or find famous digit sequences like the "Feynman Point" (six 9's in a row at the 762nd digit position). There are no hard limits on the number of digits, if you experience a freeze please see "Warnings" below.

Leave comments with your Pi calculation time on the AGM+FFT formula for 1 million digits. Also the most digits you can calculate, which tests your phone's memory. The author's Huawei Ascend P1 takes 25 sec for 1 million and can do at most 33 million digits. Note that the AGM+FFT algorithm works in powers of 2, so calculating 10 million digits takes just as much time and memory as 16 million digits (the internal precision is shown in the output). On multi-core processors RealPi tests the performance of a single core. For accurate benchmark timing ensure that no other applications are running and your phone is not hot enough to throttle the CPU.

Search function:

Use this to find patterns in Pi like your birthday. For best results calculate at least one million digits using the AGM + FFT formula, then select the "Search for Patterns" menu option.

Here's a summary of the available algorithms:

-AGM + FFT formula (Arithmetic Geometric Mean): This is one of the fastest available methods to calculate Pi, and is the default formula used by RealPi when you press "Start". It runs as native C++ code and is based on Takuya Ooura's pi_fftc6 program. For many millions of digits it can require a lot of memory, which often becomes the limiting factor in how many digits you can calculate.

-Machin's formula: This formula was discovered by John Machin in 1706. It's not nearly as fast as AGM + FFT, but shows you all the digits of Pi accumulating in real time as the calculation proceeds. Choose this formula in the settings menu and then press "Start". It's written in Java using the BigDecimal class. You should probably not ask it to compute much more than 10000 digits.

-Nth digit of Pi formula by Gourdon: This formula shows that it's possible (surprisingly) to calculate decimal digits of Pi "in the middle" without calculating the preceding digits, and needs very little memory. When you press the "Nth Digit" button RealPi determines 9 digits of Pi ending with the digit position you specify. It runs as native C++ code and is based on Xavier Gourdon's pidec program. Although it's faster than Machin's formula it can't beat the AGM + FFT formula in speed.

-Nth digit of Pi formula by Bellard: Gourdon's algorithm for the Nth digit of Pi can't be used for the first 50 digits, so this formula by Fabrice Bellard is used instead if digits < 50.

Permissions:

If you enable the "Calculate when in sleep" option RealPi will keep calculating while your screen is off, useful when calculating many digits of Pi. While not calculating or after the calculation finishes your device will go into deep sleep as usual.

Warnings:

This app can drain your battery quickly when doing a long calculation, especially if the "Calculate when in sleep" option is on.

Calculation speed depends on your device's CPU speed and memory. At very large numbers of digits RealPi may terminate unexpectedly or not produce an answer. It could also take a very long time to run (years). This is due to the large amount of memory and/or CPU time needed. The upper limit on the number of digits you can calculate depends on your Android device.

Changes to the "Calculate when in sleep" option take effect for the next Pi calculation, not in the middle of a calculation.

Recent changes:

1.1 2014-04-30

-Updated to use new theme, add action bar

-Enabled Move to SD

-Added warnings when Machin or Gourdon formula will take a long time to run

-Removed support for Cupcake, Donut

Pi music may be coming one day in a future version of this app! Pi fanatics check out this song composed by Michael Blake based on Tau (2Pi) www.youtube.com/watch?v=3174T-3-59Q

Leave comments with your Pi calculation time on the AGM+FFT formula for 1 million digits. Also the most digits you can calculate, which tests your phone's memory. The author's Huawei Ascend P1 takes 25 sec for 1 million and can do at most 33 million digits. Note that the AGM+FFT algorithm works in powers of 2, so calculating 10 million digits takes just as much time and memory as 16 million digits (the internal precision is shown in the output). On multi-core processors RealPi tests the performance of a single core. For accurate benchmark timing ensure that no other applications are running and your phone is not hot enough to throttle the CPU.

Search function:

Use this to find patterns in Pi like your birthday. For best results calculate at least one million digits using the AGM + FFT formula, then select the "Search for Patterns" menu option.

Here's a summary of the available algorithms:

-AGM + FFT formula (Arithmetic Geometric Mean): This is one of the fastest available methods to calculate Pi, and is the default formula used by RealPi when you press "Start". It runs as native C++ code and is based on Takuya Ooura's pi_fftc6 program. For many millions of digits it can require a lot of memory, which often becomes the limiting factor in how many digits you can calculate.

-Machin's formula: This formula was discovered by John Machin in 1706. It's not nearly as fast as AGM + FFT, but shows you all the digits of Pi accumulating in real time as the calculation proceeds. Choose this formula in the settings menu and then press "Start". It's written in Java using the BigDecimal class. You should probably not ask it to compute much more than 10000 digits.

-Nth digit of Pi formula by Gourdon: This formula shows that it's possible (surprisingly) to calculate decimal digits of Pi "in the middle" without calculating the preceding digits, and needs very little memory. When you press the "Nth Digit" button RealPi determines 9 digits of Pi ending with the digit position you specify. It runs as native C++ code and is based on Xavier Gourdon's pidec program. Although it's faster than Machin's formula it can't beat the AGM + FFT formula in speed.

-Nth digit of Pi formula by Bellard: Gourdon's algorithm for the Nth digit of Pi can't be used for the first 50 digits, so this formula by Fabrice Bellard is used instead if digits < 50.

Permissions:

If you enable the "Calculate when in sleep" option RealPi will keep calculating while your screen is off, useful when calculating many digits of Pi. While not calculating or after the calculation finishes your device will go into deep sleep as usual.

Warnings:

This app can drain your battery quickly when doing a long calculation, especially if the "Calculate when in sleep" option is on.

Calculation speed depends on your device's CPU speed and memory. At very large numbers of digits RealPi may terminate unexpectedly or not produce an answer. It could also take a very long time to run (years). This is due to the large amount of memory and/or CPU time needed. The upper limit on the number of digits you can calculate depends on your Android device.

Changes to the "Calculate when in sleep" option take effect for the next Pi calculation, not in the middle of a calculation.

Recent changes:

1.1 2014-04-30

-Updated to use new theme, add action bar

-Enabled Move to SD

-Added warnings when Machin or Gourdon formula will take a long time to run

-Removed support for Cupcake, Donut

Pi music may be coming one day in a future version of this app! Pi fanatics check out this song composed by Michael Blake based on Tau (2Pi) www.youtube.com/watch?v=3174T-3-59Q

RealPi provides some of the best and most interesting Pi calculation algorithms out there. This app is a benchmark which tests your Android device's CPU and memory performance. It calculates the value of Pi to the number of decimal places you specify. You can view and search for patterns in the resulting digits to find your birthday in Pi or find famous digit sequences like the "Feynman Point" (six 9's in a row at the 762nd digit position). There are no hard limits on the number of digits, if you experience a freeze please see "Warnings" below.

Leave comments with your Pi calculation time on the AGM+FFT formula for 1 million digits. Also the most digits you can calculate, which tests your phone's memory. The author's Huawei Ascend P1 takes 25 sec for 1 million and can do at most 33 million digits. Note that the AGM+FFT algorithm works in powers of 2, so calculating 10 million digits takes just as much time and memory as 16 million digits (the internal precision is shown in the output). On multi-core processors RealPi tests the performance of a single core. For accurate benchmark timing ensure that no other applications are running and your phone is not hot enough to throttle the CPU.

Search function:

Use this to find patterns in Pi like your birthday. For best results calculate at least one million digits using the AGM + FFT formula, then select the "Search for Patterns" menu option.

Here's a summary of the available algorithms:

-AGM + FFT formula (Arithmetic Geometric Mean): This is one of the fastest available methods to calculate Pi, and is the default formula used by RealPi when you press "Start". It runs as native C++ code and is based on Takuya Ooura's pi_fftc6 program. For many millions of digits it can require a lot of memory, which often becomes the limiting factor in how many digits you can calculate.

-Machin's formula: This formula was discovered by John Machin in 1706. It's not nearly as fast as AGM + FFT, but shows you all the digits of Pi accumulating in real time as the calculation proceeds. Choose this formula in the settings menu and then press "Start". It's written in Java using the BigDecimal class. You should probably not ask it to compute much more than 10000 digits.

-Nth digit of Pi formula by Gourdon: This formula shows that it's possible (surprisingly) to calculate decimal digits of Pi "in the middle" without calculating the preceding digits, and needs very little memory. When you press the "Nth Digit" button RealPi determines 9 digits of Pi ending with the digit position you specify. It runs as native C++ code and is based on Xavier Gourdon's pidec program. Although it's faster than Machin's formula it can't beat the AGM + FFT formula in speed.

-Nth digit of Pi formula by Bellard: Gourdon's algorithm for the Nth digit of Pi can't be used for the first 50 digits, so this formula by Fabrice Bellard is used instead if digits < 50.

Permissions:

If you enable the "Calculate when in sleep" option RealPi will keep calculating while your screen is off, useful when calculating many digits of Pi. While not calculating or after the calculation finishes your device will go into deep sleep as usual.

Warnings:

This app can drain your battery quickly when doing a long calculation, especially if the "Calculate when in sleep" option is on.

Calculation speed depends on your device's CPU speed and memory. At very large numbers of digits RealPi may terminate unexpectedly or not produce an answer. It could also take a very long time to run (years). This is due to the large amount of memory and/or CPU time needed. The upper limit on the number of digits you can calculate depends on your Android device.

Changes to the "Calculate when in sleep" option take effect for the next Pi calculation, not in the middle of a calculation.

Recent changes:

1.1 2014-04-30

-Updated to use new theme, add action bar

-Enabled Move to SD

-Added warnings when Machin or Gourdon formula will take a long time to run

-Removed support for Cupcake, Donut

Pi music may be coming one day in a future version of this app! Pi fanatics check out this song composed by Michael Blake based on Tau (2Pi) www.youtube.com/watch?v=3174T-3-59Q

Show full description
Hide full description
Leave comments with your Pi calculation time on the AGM+FFT formula for 1 million digits. Also the most digits you can calculate, which tests your phone's memory. The author's Huawei Ascend P1 takes 25 sec for 1 million and can do at most 33 million digits. Note that the AGM+FFT algorithm works in powers of 2, so calculating 10 million digits takes just as much time and memory as 16 million digits (the internal precision is shown in the output). On multi-core processors RealPi tests the performance of a single core. For accurate benchmark timing ensure that no other applications are running and your phone is not hot enough to throttle the CPU.

Search function:

Use this to find patterns in Pi like your birthday. For best results calculate at least one million digits using the AGM + FFT formula, then select the "Search for Patterns" menu option.

Here's a summary of the available algorithms:

-AGM + FFT formula (Arithmetic Geometric Mean): This is one of the fastest available methods to calculate Pi, and is the default formula used by RealPi when you press "Start". It runs as native C++ code and is based on Takuya Ooura's pi_fftc6 program. For many millions of digits it can require a lot of memory, which often becomes the limiting factor in how many digits you can calculate.

-Machin's formula: This formula was discovered by John Machin in 1706. It's not nearly as fast as AGM + FFT, but shows you all the digits of Pi accumulating in real time as the calculation proceeds. Choose this formula in the settings menu and then press "Start". It's written in Java using the BigDecimal class. You should probably not ask it to compute much more than 10000 digits.

-Nth digit of Pi formula by Gourdon: This formula shows that it's possible (surprisingly) to calculate decimal digits of Pi "in the middle" without calculating the preceding digits, and needs very little memory. When you press the "Nth Digit" button RealPi determines 9 digits of Pi ending with the digit position you specify. It runs as native C++ code and is based on Xavier Gourdon's pidec program. Although it's faster than Machin's formula it can't beat the AGM + FFT formula in speed.

-Nth digit of Pi formula by Bellard: Gourdon's algorithm for the Nth digit of Pi can't be used for the first 50 digits, so this formula by Fabrice Bellard is used instead if digits < 50.

Permissions:

If you enable the "Calculate when in sleep" option RealPi will keep calculating while your screen is off, useful when calculating many digits of Pi. While not calculating or after the calculation finishes your device will go into deep sleep as usual.

Warnings:

This app can drain your battery quickly when doing a long calculation, especially if the "Calculate when in sleep" option is on.

Calculation speed depends on your device's CPU speed and memory. At very large numbers of digits RealPi may terminate unexpectedly or not produce an answer. It could also take a very long time to run (years). This is due to the large amount of memory and/or CPU time needed. The upper limit on the number of digits you can calculate depends on your Android device.

Changes to the "Calculate when in sleep" option take effect for the next Pi calculation, not in the middle of a calculation.

Recent changes:

1.1 2014-04-30

-Updated to use new theme, add action bar

-Enabled Move to SD

-Added warnings when Machin or Gourdon formula will take a long time to run

-Removed support for Cupcake, Donut

Pi music may be coming one day in a future version of this app! Pi fanatics check out this song composed by Michael Blake based on Tau (2Pi) www.youtube.com/watch?v=3174T-3-59Q

agm
algorithm
bellard
benchmark
bigdecimal
calculate
cpu
decimal
digits
feynman
fft
formula
gourdon
memory
million
nth
number
option
patterns
pidec
realpi
runs
sleep
takuya
when

## Comments

### Tag cloud

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### Positive comment tag cloud

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## Google Play Rankings

This app is not ranked

## Permissions

**System tools**

prevent phone from sleeping

## Libraries

### Development tools

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