Comparison

Differential Diagnosis Guide vs CTisus CT Quick Guides

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Differential Diagnosis Guide

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
Read full description

Thoracic Radiology Differential Diagnosis Guide is a convenient way to review differential diagnoses for chest CT findings and discover common CT imaging presentations associated with many diseases. Explore hundreds of diseases and imaging findings using the powerful search tool or browse through countless meticulously curated differential diagnosis lists by alphabetical order or by organ system. Includes over 100 meticulously curated CT images. An invaluable resource for radiologists, residents, fellows, and medical students at an unmatched price. Browse · Nearly 80 different top thoracic radiology differential diagnosis lists · Broad range of differential diagnoses encompassing: lung, pleura, heart, mediastinum, lymphatics, and large airways · Carefully curated, ranked, and practical differential diagnosis lists for the real world · Superb CT images help illustrate different CT imaging patterns · Browse differential diagnoses in alphabetical order or by organ system Discover · Powerful search tool accepts a broad range of imaging feature descriptions and will retrieve pertinent differential diagnosis lists · Search feature can accept a broad range of disease terms and retrieve a list of various differential diagnosis in which the disease appears - a great way to discover the range of imaging features that may be associated with a disease · Simplify discovery by using voice recognition in the Search field! Requirements · Requires a device with iOS 8 · Voice recognition in Search tab requires active internet connection

About

CTisus CT Quick Guides

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
Read full description

CTisus CT Quick Guides is a unique application that combines select CT images with imaging pearls and important clinical findings across a range of topics important to the radiologist and other medical professionals. The topics are varied and divided into 17 unique sections ranging from the adrenal gland to the vascular system. In each section there are multiple topics ranging from infectious and inflammatory disease to oncology. In each section key information is divided into subsections including  the critical CT findings, etiology, epidemiology, presentation and prognosis. We will continue to expand these modules which have won praise from our users especially as they are shared on our social media pages. Please let us know what additional topics you would like covered and any feedback on how we can improve the application. We hope you find it an important educational experience.

Screenshots

Differential Diagnosis Guide4 screens
CTisus CT Quick Guides4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Differential Diagnosis Guide versus CTisus CT Quick Guides: the parameters behind the verdict, then further details
ParameterDifferential Diagnosis GuideCTisus CT Quick Guides
PriceFreeFree
Rating4.5 (23 ratings)4.8 (6 ratings) — better
Positive reviews93.3% of reviews—
Number of ratings23 — better6
Update frequencyEvery 4 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better16.6
Further details — not scored
Size48 MB52 MB
Age rating12+17+
DeveloperRADIOLOGiQ, LLCElliot Fishman

Customer experience

Differential Diagnosis Guide

All ratings23 ratings
Positive87.0%
Neutral0.0%
Negative13.0%
Written reviews15 reviews
Positive93.3%
Neutral6.7%
Negative0.0%

CTisus CT Quick Guides

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Differential Diagnosis Guide

No in-app purchases

None

CTisus CT Quick Guides

No in-app purchases

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.

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