# Human Immune System Quiz vs Learn Skeletal System

The clearest difference is iOS requirement: Learn Skeletal System at 8.0 against Human Immune System Quiz's 11.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Human Immune System Quiz costs $1.99 and Learn Skeletal System $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Human Immune System Quiz ships an update every 43 months, Learn Skeletal System every 33 months. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Human Immune System Quiz | Learn Skeletal System |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 43 months | **Every 33 months** |
| Size | 17 MB | 19 MB |
| Requires iOS | 11.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Coskun CAKIR](https://appshunter.io/developer/482066275) | [Nurten PIRLI](https://appshunter.io/developer/1495958705) |

## What reviewers say

### Human Immune System Quiz

[App page](https://appshunter.io/ios/app/human-immune-system-quiz/id1006635722)

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

**In-app purchases:** none


### Learn Skeletal System

[App page](https://appshunter.io/ios/app/learn-skeletal-system/id1503289845)

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

**In-app purchases:** none


## Frequently asked questions

### Is Human Immune System Quiz free?

Human Immune System Quiz costs $1.99, with no in-app purchases.

### Is Learn Skeletal System free?

Learn Skeletal System costs $1.99, with no in-app purchases.

### Do Human Immune System Quiz or Learn Skeletal System have ads?

Neither Human Immune System Quiz nor Learn Skeletal System shows ads.

### Which is updated more often, Human Immune System Quiz or Learn Skeletal System?

Human Immune System Quiz ships an update every 43 months, and Learn Skeletal System every 33 months. Most recently, Human Immune System Quiz was updated on October 16, 2026 and Learn Skeletal System on October 15, 2026.

---

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