# Crash Course Online.com vs Immunity Science

The clearest difference is in-app purchases: Immunity Science at none against Crash Course Online.com's 13. Crash Course Online.com's advantage is update cadence (every 3 months vs every 14 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Crash Course Online.com sells 13 one-off in-app purchases. Immunity Science asks for nothing beyond the download.

Crash Course Online.com ships an update every 3 months, Immunity Science every 14 months. The most recent releases landed on September 25, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Crash Course Online.com | Immunity Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (78 ratings)](https://appshunter.io/ios/app/crash-course-onlinecom/id910442931/reviews)** | — |
| Number of ratings | **78** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 14 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 32 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ADHI Schools, LLC](https://appshunter.io/developer/910442934) | [Immunity Science, Inc.](https://appshunter.io/developer/1672160767) |

## What reviewers say

### Crash Course Online.com

[App page](https://appshunter.io/ios/app/crash-course-onlinecom/id910442931)

Prepare for your California state real estate exam with over 1,100 practice questions and video explanations. Reinforce concepts by answering questions correctly before moving on and take unlimited mock exams to track your progress.

**Highlights:** 1,100+ practice questions, Video explanations for most questions, Embedded vocabulary definitions, Concept reinforcement through mandatory correct answers, Unlimited mock exams, Category-specific performance tracking, Live course reservation

**Features:** macOS Compatibility

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Crash Course Online.com | $4.99 | one-time |
| Crash Course Online.com | $59.99 | one-time |
| Crash Course Online.com | $69.99 | one-time |
| Crash Course Online.com | $70.00 | one-time |
| Crash Course Online.com | $79.00 | one-time |
| Crash Course Online.com | $129.99 | one-time |
| Crash Course Online.com | $149.00 | one-time |
| Crash Course Online.com | $169.99 | one-time |
| Crash Course Online.com | $199.99 | one-time |
| Crash course Online.com | $199.99 | one-time |
| Crash Course Online.com | $219.99 | one-time |
| Crash Course Online.com | $229.99 | one-time |
| Crash Course Online.com | $299.00 | one-time |


### Immunity Science

[App page](https://appshunter.io/ios/app/immunity-science/id1672160765)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Crash Course Online.com free?

Crash Course Online.com is free to download, with in-app purchases available.

### Is Immunity Science free?

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

### Do Crash Course Online.com or Immunity Science have ads?

Neither Crash Course Online.com nor Immunity Science shows ads.

### Which is updated more often, Crash Course Online.com or Immunity Science?

Crash Course Online.com ships an update every 3 months, and Immunity Science every 14 months. Most recently, Crash Course Online.com was updated on September 25, 2026 and Immunity Science on September 15, 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.*