# Population Simulator vs SISO Calculator

The clearest difference is in-app purchases: SISO Calculator at none against Population Simulator's 1. SISO Calculator also leads on ads (none vs shown) and update cadence (every 5 weeks vs every 7 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Population Simulator sells 1 one-off in-app purchase. SISO Calculator asks for nothing beyond the download.

Population Simulator ships an update every 7 months, SISO Calculator every 5 weeks. The most recent releases landed on October 5, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Population Simulator | SISO Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/siso-calculator/id1548141101/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 5 MB | 4 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TAIKI HIRATA](https://appshunter.io/developer/719880632) | [Deft Dynamics](https://appshunter.io/developer/1288783778) |

## What reviewers say

### Population Simulator

[App page](https://appshunter.io/ios/app/population-simulator/id882348321)

**Features:** macOS Compatibility

**In-app purchases (1)**

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


### SISO Calculator

[App page](https://appshunter.io/ios/app/siso-calculator/id1548141101)

This app helps engineers and students understand System Dynamics and Controls. It offers an intuitive interface to quickly analyze controller and plant interactions in both time and frequency domains.

**Highlights:** System Dynamics analysis, Controls engineering, Intuitive interface, Time domain analysis, Frequency domain analysis, Controller interaction visualization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Population Simulator free?

Population Simulator is free to download, with in-app purchases available.

### Is SISO Calculator free?

SISO Calculator is free to download, with no in-app purchases.

### Do Population Simulator or SISO Calculator have ads?

Population Simulator shows ads; SISO Calculator does not.

### Which is updated more often, Population Simulator or SISO Calculator?

Population Simulator ships an update every 7 months, and SISO Calculator every 5 weeks. Most recently, Population Simulator was updated on October 5, 2026 and SISO Calculator on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*