# Differential Diagnosis Guide vs CTisus CT Quick Guides

The clearest difference is rating: CTisus CT Quick Guides at 4.8 against Differential Diagnosis Guide's 4.5. Differential Diagnosis Guide's advantage is ratings volume (23 vs 6) and iOS requirement (8.0 vs 16.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CTisus CT Quick Guides holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 23 and 6 respectively.

Differential Diagnosis Guide ships an update every 4 months, CTisus CT Quick Guides every 6 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Differential Diagnosis Guide | CTisus CT Quick Guides |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (23 ratings)](https://appshunter.io/ios/app/differential-diagnosis-guide/id523946690/reviews) | **[4.8 (6 ratings)](https://appshunter.io/ios/app/ctisus-ct-quick-guides/id6743173540/reviews)** |
| Number of ratings | **23** | 6 |
| Positive reviews | 93.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Monetization | Free | Free |
| Size | 48 MB | 52 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [RADIOLOGiQ, LLC](https://appshunter.io/developer/519524135) | [Elliot Fishman](https://appshunter.io/developer/399024444) |

## What reviewers say

### Differential Diagnosis Guide

[App page](https://appshunter.io/ios/app/differential-diagnosis-guide/id523946690)

This app helps medical professionals and students review differential diagnoses for chest CT findings. It offers a powerful search tool and curated lists to explore diseases and their common imaging presentations, complete with over 100 CT images.

**Highlights:** Review differential diagnoses for chest CT findings, Discover common CT imaging presentations, Search hundreds of diseases and imaging findings, Browse differential diagnosis lists by organ system, Includes over 100 curated CT images, Voice recognition search

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

**In-app purchases:** none


### CTisus CT Quick Guides

[App page](https://appshunter.io/ios/app/ctisus-ct-quick-guides/id6743173540)

This medical reference app provides radiologists and other healthcare professionals with curated CT images, imaging pearls, and clinical findings across 17 diverse topics. Key information is organized into critical findings, etiology, epidemiology, presentation, and prognosis for each subject.

**Highlights:** Curated CT images, Imaging pearls, Clinical findings, 17 topic sections, Critical CT findings, Etiology, epidemiology, presentation, prognosis

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

**In-app purchases:** none


## Frequently asked questions

### Is Differential Diagnosis Guide free?

Differential Diagnosis Guide is free to download, with no in-app purchases.

### Is CTisus CT Quick Guides free?

CTisus CT Quick Guides is free to download, with no in-app purchases.

### Which has better reviews, Differential Diagnosis Guide or CTisus CT Quick Guides?

CTisus CT Quick Guides is rated higher. Differential Diagnosis Guide averages 4.5 out of 5 from 23 ratings, while CTisus CT Quick Guides averages 4.8 from 6 ratings.

### Do Differential Diagnosis Guide or CTisus CT Quick Guides have ads?

Neither Differential Diagnosis Guide nor CTisus CT Quick Guides shows ads.

### Which is updated more often, Differential Diagnosis Guide or CTisus CT Quick Guides?

Differential Diagnosis Guide ships an update every 4 months, and CTisus CT Quick Guides every 6 months. Most recently, Differential Diagnosis Guide was updated on November 1, 2026 and CTisus CT Quick Guides on October 30, 2026.

---

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