# IACUBUS vs NBDE Exam Prep

The clearest difference is in-app purchases: IACUBUS at none against NBDE Exam Prep's 5. IACUBUS also leads on ads (none vs shown). NBDE Exam Prep's advantage is update cadence (weekly vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. NBDE Exam Prep sells 5 in-app purchases, starting at $5.99 per 7 days. IACUBUS asks for nothing beyond the download.

IACUBUS ships an update every 3 months, NBDE Exam Prep weekly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | IACUBUS | NBDE Exam Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Weekly** |
| Size | 22 MB | 47 MB |
| Requires iOS | **14.0.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jakub Niewelt](https://appshunter.io/developer/1742814360) | [Ilia Chernikov](https://appshunter.io/developer/1818071113) |

## What reviewers say

### IACUBUS

[App page](https://appshunter.io/ios/app/iacubus/id6499224968)

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

**In-app purchases:** none


### NBDE Exam Prep

[App page](https://appshunter.io/ios/app/nbde-exam-prep/id6754602164)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $5.99 | per 7 days |
| Month | $9.99 | per month |
| 3 Month | $19.99 | per 3 months |
| 1 Month | $29.99 | per month |
| 3 Month | $59.99 | per 3 months |


## Frequently asked questions

### Is IACUBUS free?

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

### Is NBDE Exam Prep free?

NBDE Exam Prep is free to download, with in-app purchases available.

### Do IACUBUS or NBDE Exam Prep have ads?

NBDE Exam Prep shows ads; IACUBUS does not.

### Which is updated more often, IACUBUS or NBDE Exam Prep?

IACUBUS ships an update every 3 months, and NBDE Exam Prep weekly. Most recently, IACUBUS was updated on October 24, 2026 and NBDE Exam Prep on October 28, 2026.

---

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