Comparison

CathSource vs Differential Diagnosis Guide

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

Head to head
About

CathSource

A comprehensive medical reference focused on cardiac catheterization and angiography. It offers a searchable index of specialized topics, a database of videos of common and rare findings, and a collection of images including hemodynamic formulas and tables.

Highlights
  • Searchable index of cardiac catheterization topics
  • Database of coronary angiogram, ventriculogram, and aortogram videos
  • Image database with hemodynamic formulas and tables
  • Covers common and rare cardiovascular pathologies
  • Developed by practicing Interventional Cardiologists
Features
Read full description

CathSource (from the creators of ECGsource) is an up-to-date medical reference devoted exclusively to cardiac catheterization and angiography. Developed by practicing Interventional Cardiologists for both specialists and trainees in the field of cardiovascular disease, CathSource offers the following content: * Searchable index of specialized topics including: Normal Coronary Anatomy Anomalous Coronary Arteries Coronary Artery Aneurysms Myocardial Bridging Takotsubo Cardiomyopathy Plaque Rupture & Thrombus Standard Views of Angiography Left Ventriculography Coarctation of the Aorta Femoral Artery Access for Angiography Radial Artery Access for Angiography Intravascular Ultrasound (IVUS) Optical Coherence Tomography (OCT) Fractional Flow Reserve (FFR) Hemodynamics: Intracardiac Pressures Hemodynamics: Intracardiac Waveforms Hemodynamics: Cardiac Output Hemodynamics: Intracardiac Shunts Hemodynamics: Aortic Stenosis Hemodynamcis: Aortic Regurgitation Hemodynamics: Mitral Stenosis Hemodynamcis: Mitral Regurgitation Hemodynamcis: Constriction Hemodynamics: Restriction * Searchable database containing more than 30 videos (coronary angiograms, ventriculograms, and aortograms) of both common and rare findings in the cardiac catheterization lab * Searchable database of over 65 images including hemodynamic formulas, tables, and figures CathSource provides a detailed overview of important cardiac catheterization and angiography topics, incorporating educational images/videos as well as reviews of pertinent medical literature. CathSource is the ideal application to assist you in understanding and recognizing cardiovascular pathology in the catheterization lab.

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

Screenshots

CathSource4 screens
Differential Diagnosis Guide4 screens

Verdict

The call

The clearest difference is review sentiment: Differential Diagnosis Guide at 89% against CathSource's 43%. Differential Diagnosis Guide also leads on rating (4.5 vs 1.6) and monetization model (free vs paid). On price, ratings volume, update cadence and ads 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

Differential Diagnosis Guide holds the better App Store score, 4.5 against 1.6. Both are backed by a comparable volume of ratings — 23 and 22 respectively. Written reviews point the same way: 43% of CathSource's written reviews are positive against 89% of Differential Diagnosis Guide's.

UpkeepUpdate frequency

CathSource ships an update every 2 months, Differential Diagnosis Guide every 4 months. The most recent releases landed on September 18, 2026 and June 4, 2026 respectively.

Scorecard4 real differences · 6 level
CathSource versus Differential Diagnosis Guide: the parameters behind the verdict, then further details
ParameterCathSourceDifferential Diagnosis Guide
PriceFreeFree
Rating1.6 (23 ratings)4.5 (22 ratings) — better
Positive reviews42.9% of reviews88.9% of reviews — better
Number of ratings23 — better22
Update frequencyEvery 2 months — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.58.0 — better
Further details — not scored
Size79 MB48 MB
Age rating12+12+
DeveloperECGsource LLCRADIOLOGiQ, LLC

Customer experience

CathSource

All ratings23 ratings
Positive8.7%
Neutral8.7%
Negative82.6%
Written reviews35 reviews
Positive42.9%
Neutral8.6%
Negative48.6%

Differential Diagnosis Guide

All ratings22 ratings
Positive86.4%
Neutral0.0%
Negative13.6%
Written reviews9 reviews
Positive88.9%
Neutral11.1%
Negative0.0%

In-app purchases

None

CathSource

No in-app purchases

None

Differential Diagnosis Guide

No in-app purchases

Questions

Is CathSource free?
CathSource is free to download, with no in-app purchases.
Is Differential Diagnosis Guide free?
Differential Diagnosis Guide is free to download, with no in-app purchases.
Which has better reviews, CathSource or Differential Diagnosis Guide?
Differential Diagnosis Guide is rated higher. CathSource averages 1.6 out of 5 from 23 ratings, while Differential Diagnosis Guide averages 4.5 from 22 ratings.
Do CathSource or Differential Diagnosis Guide have ads?
Neither CathSource nor Differential Diagnosis Guide shows ads.
Which is updated more often, CathSource or Differential Diagnosis Guide?
CathSource ships an update every 2 months, and Differential Diagnosis Guide every 4 months. Most recently, CathSource was updated on September 18, 2026 and Differential Diagnosis Guide on June 4, 2026.

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