# NEJM Image Challenge vs MGH Nephrology Guide

The clearest difference is price: MGH Nephrology Guide at Free against NEJM Image Challenge's $9.99. MGH Nephrology Guide also leads on update cadence (every 6 months vs every 16 months) and ratings volume (27 vs 9). NEJM Image Challenge's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 15.0). On rating, review sentiment, ads and device support there is nothing between them.

MGH Nephrology Guide is free to download; NEJM Image Challenge costs $9.99 up front. MGH Nephrology Guide sells 1 in-app purchase, starting at $49.99 per year. NEJM Image Challenge asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for NEJM Image Challenge against 4.7 for MGH Nephrology Guide. Both are backed by a comparable volume of ratings — 9 and 27 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

NEJM Image Challenge ships an update every 16 months, MGH Nephrology Guide every 6 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | NEJM Image Challenge | MGH Nephrology Guide |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.8 (9 ratings)](https://appshunter.io/ios/app/nejm-image-challenge/id403219522/reviews)** | [4.7 (27 ratings)](https://appshunter.io/ios/app/mgh-nephrology-guide/id1346849427/reviews) |
| Number of ratings | 9 | **27** |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 6 months** |
| Monetization | **Paid** | Subscription |
| Size | 5 MB | 10 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [The New England Journal of Medicine](https://appshunter.io/developer/373156257) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### NEJM Image Challenge

[App page](https://appshunter.io/ios/app/nejm-image-challenge/id403219522)

Test and sharpen your diagnostic and visual skills with challenging clinical photos. This app offers detailed images with zoom capabilities and immediate feedback on diagnoses. It's designed for medical professionals to practice anytime, anywhere.

**Highlights:** Challenging clinical photos, Zoomable detailed images, Immediate diagnostic feedback, See how others answered, Random image selection

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

**In-app purchases:** none


### MGH Nephrology Guide

[App page](https://appshunter.io/ios/app/mgh-nephrology-guide/id1346849427)

A quick reference for diagnosing and managing kidney disease, electrolyte, and acid-base disorders. Developed by MGH experts, it offers over 150 topics with extensive tables, figures, and images. Includes integration with Prime PubMed for literature access and regular content updates.

**Highlights:** 150+ topics in fast-read format, 320+ tables, charts, and figures, Sections on dialysis and transplantation, Regular automatic updates, Highlighting and note-taking, Prime PubMed integration, Keyword search and bookmarking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MGH Nephrology Guide | $49.99 | per year |


## Frequently asked questions

### Is NEJM Image Challenge free?

NEJM Image Challenge costs $9.99, with no in-app purchases.

### Is MGH Nephrology Guide free?

MGH Nephrology Guide is free to download, with in-app purchases available.

### Which has better reviews, NEJM Image Challenge or MGH Nephrology Guide?

NEJM Image Challenge is rated higher. NEJM Image Challenge averages 4.8 out of 5 from 9 ratings, while MGH Nephrology Guide averages 4.7 from 27 ratings.

### Do NEJM Image Challenge or MGH Nephrology Guide have ads?

Neither NEJM Image Challenge nor MGH Nephrology Guide shows ads.

### Which is updated more often, NEJM Image Challenge or MGH Nephrology Guide?

NEJM Image Challenge ships an update every 16 months, and MGH Nephrology Guide every 6 months. Most recently, NEJM Image Challenge was updated on November 6, 2026 and MGH Nephrology Guide on November 2, 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.*