# AOSB vs ATC Aptitude Test Prep

The clearest difference is in-app purchases: AOSB at none against ATC Aptitude Test Prep's 1. ATC Aptitude Test Prep's advantage is update cadence (daily vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ATC Aptitude Test Prep sells 1 one-off in-app purchase. AOSB asks for nothing beyond the download.

AOSB ships an update every 2 weeks, ATC Aptitude Test Prep daily. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | AOSB | ATC Aptitude Test Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 12 MB | 58 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [George Lee](https://appshunter.io/developer/1295254226) | [Joseph Halls](https://appshunter.io/developer/6792848111) |

## What reviewers say

### AOSB

[App page](https://appshunter.io/ios/app/aosb/id6762511460)

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

**In-app purchases:** none


### ATC Aptitude Test Prep

[App page](https://appshunter.io/ios/app/atc-aptitude-test-prep/id6804258156)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ATC Exam Pro | $12.99 | one-time |


## Frequently asked questions

### Is AOSB free?

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

### Is ATC Aptitude Test Prep free?

ATC Aptitude Test Prep is free to download, with in-app purchases available.

### Do AOSB or ATC Aptitude Test Prep have ads?

Neither AOSB nor ATC Aptitude Test Prep shows ads.

### Which is updated more often, AOSB or ATC Aptitude Test Prep?

AOSB ships an update every 2 weeks, and ATC Aptitude Test Prep daily. Most recently, AOSB was updated on November 5, 2026 and ATC Aptitude Test Prep on November 6, 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.*