# GASpedia vs CircSim

The clearest difference is price: GASpedia at Free against CircSim's $5.99. CircSim's advantage is update cadence (every 6 days vs fortnightly) and iOS requirement (13.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

GASpedia is free to download; CircSim costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GASpedia ships an update fortnightly, CircSim every 6 days. The most recent releases landed on September 27, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | GASpedia | CircSim |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Monetization | — | Paid |
| Size | 35 MB | 23 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Toshiyuki HASHIMOTO](https://appshunter.io/developer/1872402071) | [TARO KUMANDA](https://appshunter.io/developer/1877582069) |

## What reviewers say

### GASpedia

[App page](https://appshunter.io/ios/app/gaspedia/id6758344006)

**Features:** macOS Compatibility

**In-app purchases:** none


### CircSim

[App page](https://appshunter.io/ios/app/circsim/id6759235234)

Simulate the circulatory system by adjusting various parameters. Ideal for studying circulation and waveforms, it displays pressure waveforms, flow waveforms, and PV loops. Offers a simplified left-heart-only mode for educational purposes.

**Highlights:** Circulatory system simulation, Pressure waveform display, Flow waveform display, PV loop visualization, Left-heart-only mode, Parameter preset saving, Drawing save for comparison

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GASpedia free?

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

### Is CircSim free?

CircSim costs $5.99, with no in-app purchases.

### Do GASpedia or CircSim have ads?

Neither GASpedia nor CircSim shows ads.

### Which is updated more often, GASpedia or CircSim?

GASpedia ships an update fortnightly, and CircSim every 6 days. Most recently, GASpedia was updated on September 27, 2026 and CircSim on October 8, 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.*