# googolChooChoo3D vs Aquarium Sim

The clearest difference is review sentiment: Aquarium Sim at 83% against googolChooChoo3D's 47%. Aquarium Sim also leads on in-app purchases (none vs 1) and rating (4.0 vs 3.6). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. googolChooChoo3D sells 1 one-off in-app purchase. Aquarium Sim asks for nothing beyond the download.

Aquarium Sim holds the better App Store score, 4.0 against 3.6. Both are backed by a comparable volume of ratings — 70 and 43 respectively. Written reviews point the same way: 47% of googolChooChoo3D's written reviews are positive against 83% of Aquarium Sim's.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | googolChooChoo3D | Aquarium Sim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (70 ratings)](https://appshunter.io/ios/app/googolchoochoo3d/id642845435/reviews) | **[4.0 (43 ratings)](https://appshunter.io/ios/app/aquarium-sim/id1155194815/reviews)** |
| Number of ratings | **70** | 43 |
| Positive reviews | 47.5% of reviews | **83.3% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 30 MB | 78 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kouichi Hayashi](https://appshunter.io/developer/1809037541) | [1788918 Alberta Ltd](https://appshunter.io/developer/597315953) |

## What reviewers say

### googolChooChoo3D

[App page](https://appshunter.io/ios/app/googolchoochoo3d/id642845435)

Create and explore 3D model railroad layouts with ease. Design your own tracks and scenery by dragging and dropping elements. Experience your creations from various viewpoints, including the driver's seat of a moving train.

**Highlights:** 3D model railroad simulation, Drag-and-drop layout creation, Customizable track and item placement, Multiple camera views, Driver's seat perspective, Scenery design

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Aquarium Sim

[App page](https://appshunter.io/ios/app/aquarium-sim/id1155194815)

Create and manage your own virtual aquarium filled with a diverse range of marine and freshwater fish. Customize your underwater environment with various habitats and interact with your aquatic pets by feeding them. Enjoy a relaxing visual experience with realistic fish behaviors.

**Highlights:** 82 detailed fish species, Customizable aquarium environments, Realistic swimming behaviors, Interactive feeding and tapping, Marine and freshwater habitats

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is googolChooChoo3D free?

googolChooChoo3D is free to download, with in-app purchases available.

### Is Aquarium Sim free?

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

### Which has better reviews, googolChooChoo3D or Aquarium Sim?

Aquarium Sim is rated higher. googolChooChoo3D averages 3.6 out of 5 from 70 ratings, while Aquarium Sim averages 4.0 from 43 ratings.

### Do googolChooChoo3D or Aquarium Sim have ads?

Both googolChooChoo3D and Aquarium Sim show ads.

### Which is updated more often, googolChooChoo3D or Aquarium Sim?

googolChooChoo3D ships an update every 3 months, and Aquarium Sim every 3 months. Most recently, googolChooChoo3D was updated on November 1, 2026 and Aquarium Sim on November 2, 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.*