# The Human Body by Tinybop vs Retigo Evolution

The clearest difference is price: Retigo Evolution at Free against The Human Body by Tinybop's $3.99. Retigo Evolution also leads on in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 5 months). The Human Body by Tinybop's advantage is chart position (#103 vs unranked). On ads, device support and iOS requirement there is nothing between them.

Retigo Evolution is free to download; The Human Body by Tinybop costs $3.99 up front. The Human Body by Tinybop sells 2 one-off in-app purchases. Retigo Evolution asks for nothing beyond the download.

The Human Body by Tinybop ships an update every 5 months, Retigo Evolution every 3 weeks. The most recent releases landed on October 19, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | The Human Body by Tinybop | Retigo Evolution |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.2 (398 ratings)](https://appshunter.io/ios/app/the-human-body-by-tinybop/id682046579/reviews)** | — |
| Number of ratings | **398** | — |
| Positive reviews | 67.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#103** | — |
| Size | 125 MB | 314 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tinybop Inc.](https://appshunter.io/developer/682046582) | [Retigo](https://appshunter.io/developer/1806839633) |

## What reviewers say

### The Human Body by Tinybop

[App page](https://appshunter.io/ios/app/the-human-body-by-tinybop/id682046579)

**Currently charting:** #103 Top Paid · Education (US App Store)

Explore the human body through interactive models of its systems. Discover how the heart beats, lungs breathe, and more. This app is designed for children and adults to foster foundational science literacy through engaging exploration.

**Highlights:** Explore 8 interactive body systems, Detailed interactive models of organs, Simulate body functions, Learn vocabulary in 50+ languages, Kid-friendly design with avatars, Expert-reviewed handbook included

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The Urogenital System | $0.99 | one-time |
| The Immune System | $0.99 | one-time |

**What reviewers like**

- 🚀 Visually appealing
- 👍 Interactive and engaging
- 🧠 Helps kids learn about the body
- 🎓 Educational and informative

**What reviewers complain about**

- 🐛 Crashes frequently
- 🤔 Confusing navigation and UI
- 💰 Expensive for limited content
- 🔇 Lack of audio/voice instructions

**Reported bugs**

- Inability to restore in-app purchases
- Compatibility issues with newer iOS versions
- Freezing and crashing on certain actions

**Requested features**

- Add more body systems (e.g. endocrine, lymphatic)
- Include pronunciations of body part names
- Provide more detailed explanations of processes
- Allow customization of the human model


### Retigo Evolution

[App page](https://appshunter.io/ios/app/retigo-evolution/id6752422729)

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

**In-app purchases:** none


## Frequently asked questions

### Is The Human Body by Tinybop free?

The Human Body by Tinybop costs $3.99, and also offers in-app purchases.

### Is Retigo Evolution free?

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

### Do The Human Body by Tinybop or Retigo Evolution have ads?

Neither The Human Body by Tinybop nor Retigo Evolution shows ads.

### Which is updated more often, The Human Body by Tinybop or Retigo Evolution?

The Human Body by Tinybop ships an update every 5 months, and Retigo Evolution every 3 weeks. Most recently, The Human Body by Tinybop was updated on October 19, 2026 and Retigo Evolution on October 16, 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.*