# Zero Deficit vs BrainRock

The clearest difference is in-app purchases: BrainRock at none against Zero Deficit's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Zero Deficit sells 3 in-app purchases, starting at $14.99 per month. BrainRock asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Zero Deficit | BrainRock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/zero-deficit-ccrn-exam-prep/id6758719491/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 164 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [ZERO DEFICIT LLC](https://appshunter.io/developer/1874574916) | [HAYOUNG KOH](https://appshunter.io/developer/1544967719) |

## What reviewers say

### Zero Deficit

[App page](https://appshunter.io/ios/app/zero-deficit-ccrn-exam-prep/id6758719491)

Prepare for your CCRN exam with a comprehensive study tool built by an ICU nurse. It offers over 695 practice questions with detailed rationales, AI-powered personalization, smart flashcards, and full-length simulation exams to identify and address knowledge gaps.

**Highlights:** 695+ high-yield practice questions, Detailed rationales for every question, AI-powered personalized study guides, 190+ smart flashcards with spaced repetition, Full-length simulation exams, Detailed performance analytics, Exclusive cheat sheets

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero Deficit CCRN PREP MONTHLY | $14.99 | per month |
| Zero Deficit CCRNPrep PremiumAnnual | $84.99 | per year |
| Zero Deficit CCRN Prep Lifetime | $199.99 | one-time |


### BrainRock

[App page](https://appshunter.io/ios/app/brainrock-master-languages/id6761912280)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zero Deficit free?

Zero Deficit is free to download, with in-app purchases available.

### Is BrainRock free?

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

### Do Zero Deficit or BrainRock have ads?

Neither Zero Deficit nor BrainRock shows ads.

### Which is updated more often, Zero Deficit or BrainRock?

Zero Deficit ships an update weekly, and BrainRock weekly. Most recently, Zero Deficit was updated on October 10, 2026 and BrainRock on October 5, 2026.

---

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