# CEN Exam Prep vs Zero Deficit

The clearest difference is rating: Zero Deficit at 5.0 against CEN Exam Prep's 4.3. Zero Deficit also leads on update cadence (weekly vs every 2 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. CEN Exam Prep sells 1 in-app purchase, starting at $19.99 per month and Zero Deficit sells 3 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

Zero Deficit holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 7 and 4 respectively.

CEN Exam Prep ships an update every 2 months, Zero Deficit weekly. Both last shipped on November 5, 2026.

## The numbers

| Metric | CEN Exam Prep | Zero Deficit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (7 ratings)](https://appshunter.io/ios/app/cen-exam-prep-2026/id6748470330/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/zero-deficit-ccrn-exam-prep/id6758719491/reviews)** |
| Number of ratings | **7** | 4 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 61 MB | 3 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Quizzard Exam Preperation Inc.](https://appshunter.io/developer/1707617401) | [ZERO DEFICIT LLC](https://appshunter.io/developer/1874574916) |

## What reviewers say

### CEN Exam Prep

[App page](https://appshunter.io/ios/app/cen-exam-prep-2026/id6748470330)

Prepare for the Certified Emergency Nurse exam with over 2,000 practice questions and mock exams. This app offers personalized review of missed questions and estimates your passing probability. Achieve your certification with confidence.

**Highlights:** 2,000+ practice questions, 14+ practice quizzes per section, Review of missed questions, Realistic mock exams, Passing probability estimator, Study notifications, Practice hints

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $19.99 | per month |


### 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 |


## Frequently asked questions

### Is CEN Exam Prep free?

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

### Is Zero Deficit free?

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

### Which has better reviews, CEN Exam Prep or Zero Deficit?

Zero Deficit is rated higher. CEN Exam Prep averages 4.3 out of 5 from 7 ratings, while Zero Deficit averages 5.0 from 4 ratings.

### Do CEN Exam Prep or Zero Deficit have ads?

Neither CEN Exam Prep nor Zero Deficit shows ads.

### Which is updated more often, CEN Exam Prep or Zero Deficit?

CEN Exam Prep ships an update every 2 months, and Zero Deficit weekly. Most recently, CEN Exam Prep was updated on November 5, 2026 and Zero Deficit on November 5, 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.*