# Population Simulator — Study Ecology By Logistic Map

> Study Ecology By Logistic Map (iPhone/iPad app by TAIKI HIRATA.)

- Source: https://appshunter.io/ios/app/population-simulator/id882348321 (this page in markdown: same URL + `.md`)
- Developer: [TAIKI HIRATA](https://appshunter.io/developer/719880632)
- Category: Education, Business
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 5 MB
- Languages: American English, Japanese
- Released: 2014-05-30
- Data updated: 2025-12-16
- User reviews in markdown: https://appshunter.io/ios/app/population-simulator/id882348321/reviews.md

## What is Population Simulator?

"Population simulator" is an application to visually see the changes in the population by using "Logistic Map".

You can see the change in the population by the Logistic Map by a line graph and colony size.
You can observe the variation pattern of population variety by changing slightly the initial value.

Logistic Map is not only used in Population Ecology but also considered one of the starting point of Chaos Theory. I developed this app to help people who are studying Population Ecology or Chaos Theory.

＊Logistic Map may not necessarily apply to changes in population of actual organisms, because Logistic Map is a model of a simple change of the population.


■What is Logistic Map?
The Logistic Map is the map that is generated from the Logistic Function that has been devised as a variation model of the population of an organism.
It is expressed by the following function.

X(n+1) = a・X(n)・(1-X(n))

In the above equation, the meaning of each symbol is as follows.

・n:Generation (n=1,2,3,...)
・X(n):Value obtained by normalizing the Population of Generation n-th（0≦X(n)≦1)
・a:Value obtained by normalizing the Reproductive Rates（0≦a≦4)

You can calculate the population of the next generation from a population of a certain generation by using this function. In addition, You can predict the variation of the population over the long term by calculating the population of individuals repeatedly in this function.


■Pattern of Logistic Map
Logistic map vary widely depending on the value of "a".

・In case (0≦a≦1) : X(n) converges to 0.
・In case (1＜a≦2) : X(n) converges to 1-(1/a).
・In case (2＜a≦3) : X(n) converges to 1-(1/a) while oscillating.
・In case (3＜a≦3.5699456・・・) : X(n) oscillate between the periodic point individual Power of 2
・In case (3.5699456・・・＜a≦4) : X(n) Change irregularly.（Chaotic region）＊It may become periodically by the value of a.

Please try to observe the changes of Logistic Map by changing the various initial values​​.


■Main function of App
1. Simulation of changes in colony size
2. Line graph of changes in population
3. Output CSV file（Need to purchase add-on.）
4. Output Graph Image（Need to purchase add-on.）

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Add Output Function | $0.99 | one-time |



## Version history (last 5 releases)

### 2.0 — 2023-04-25

・Supported iOS16.

### 1.9 — 2021-09-30

Support iOS15.

### 1.8.1 — 2020-12-21

Updated advertising SDK.

### 1.8 — 2020-10-08

Support iOS14.

### 1.7 — 2019-10-07

1. Support iOS13.
2. Support Dark Mode on iOS13.
3. Support screen rotation and multitasking on iPad.

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All apps by TAIKI HIRATA: https://appshunter.io/developer/719880632

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2025-12-16.*