# Arithmetic Review vs Immunity Science

The clearest difference is in-app purchases: Immunity Science at none against Arithmetic Review's 1. Immunity Science also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Arithmetic Review sells 1 one-off in-app purchase. Immunity Science asks for nothing beyond the download.

Arithmetic Review ships an update every 8 months, Immunity Science every 14 months. The most recent releases landed on August 27, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Arithmetic Review | Immunity Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4 ratings)](https://appshunter.io/ios/app/arithmetic-review-gre-lite/id605344887/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 14 months |
| Monetization | Free | — |
| Size | 10 MB | 32 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Webrich Software Limited](https://appshunter.io/developer/290203591) | [Immunity Science, Inc.](https://appshunter.io/developer/1672160767) |

## What reviewers say

### Arithmetic Review

[App page](https://appshunter.io/ios/app/arithmetic-review-gre-lite/id605344887)

Prepare for the GRE with over 450 practice questions covering arithmetic topics. Get instant feedback, detailed explanations, and track your progress with visual tools to ensure you're ready for test day.

**Highlights:** 450+ practice questions, Detailed explanations, Instant feedback, Progress tracking with charts, Topic-specific review, Mock tests

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $9.99 | 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 Arithmetic Review free?

Arithmetic Review 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 Arithmetic Review or Immunity Science have ads?

Neither Arithmetic Review nor Immunity Science shows ads.

### Which is updated more often, Arithmetic Review or Immunity Science?

Arithmetic Review ships an update every 8 months, and Immunity Science every 14 months. Most recently, Arithmetic Review was updated on August 27, 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.*