Comparison

CathSource vs Lung CT Field 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

Lung CT Field Guide

This app helps physicians, especially radiologists and pulmonologists, interpret lung CT scans. It features a library of CT images and illustrations of lung diseases, along with an experimental engine to suggest differential diagnoses based on observed findings.

Highlights
  • Lung CT image library
  • Color graphic illustrations of lung disease patterns
  • Experimental differential diagnosis engine
  • Organized by CT findings and distribution
  • Over 100 curated images and illustrations
Features
Read full description

Introducing the Lung CT Field Guide app, an excellent resource for a wide-range of physician specialists, in particular radiologists and pulmonologists. One of the critical steps in interpreting a lung CT is identifying and appropriately describing imaging findings in the lung. Review and explore lung CT images and color graphic illustrations of the fundamental patterns of lung disease on CT. Play with an experimental diagnosis engine that will try to suggest a differential diagnosis list to consider with any number and combination of lung CT findings! Includes over 100 carefully curated CT images and color graphic illustrations. An invaluable resource for staff physicians, fellow physicians, resident physicians, and medical students at an unmatched price. Browse · Over 60 prototypical lung CT images, organized by: increased attenuation findings, decreased attenuation findings, miscellaneous findings, craniocaudal distribution, and axial distribution · Nearly 60 color graphic illustrations of prototypical lung CT imaging features Discover · Experimental diagnosis engine takes your lung CT observations and will try to suggest a differential diagnosis list to consider - for educational purposes only Requirements · Requires a device with iOS 7 or later

Screenshots

CathSource4 screens
Lung CT Field Guide4 screens

Verdict

The call

The clearest difference is review sentiment: Lung CT Field Guide at 100% against CathSource's 43%. Lung CT Field Guide also leads on rating (5.0 vs 1.6) and monetization model (free vs paid). CathSource's advantage is update cadence (every 2 months vs every 6 months). On price, ratings volume, 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

Lung CT Field Guide holds the better App Store score, 5.0 against 1.6. Both are backed by a comparable volume of ratings — 23 and 11 respectively. Written reviews point the same way: 43% of CathSource's written reviews are positive against 100% of Lung CT Field Guide's.

UpkeepUpdate frequency

CathSource ships an update every 2 months, Lung CT Field Guide every 6 months. The most recent releases landed on September 18, 2026 and June 4, 2026 respectively.

Scorecard5 real differences · 5 level
CathSource versus Lung CT Field Guide: the parameters behind the verdict, then further details
ParameterCathSourceLung CT Field Guide
PriceFreeFree
Rating1.6 (23 ratings)5.0 (11 ratings) — better
Positive reviews42.9% of reviews100.0% of reviews — better
Number of ratings23 — better11
Update frequencyEvery 2 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.58.0 — better
Further details — not scored
Size79 MB58 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%

Lung CT Field Guide

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

CathSource

No in-app purchases

None

Lung CT Field Guide

No in-app purchases

Questions

Is CathSource free?
CathSource is free to download, with no in-app purchases.
Is Lung CT Field Guide free?
Lung CT Field Guide is free to download, with no in-app purchases.
Which has better reviews, CathSource or Lung CT Field Guide?
Lung CT Field Guide is rated higher. CathSource averages 1.6 out of 5 from 23 ratings, while Lung CT Field Guide averages 5.0 from 11 ratings.
Do CathSource or Lung CT Field Guide have ads?
Neither CathSource nor Lung CT Field Guide shows ads.
Which is updated more often, CathSource or Lung CT Field Guide?
CathSource ships an update every 2 months, and Lung CT Field Guide every 6 months. Most recently, CathSource was updated on September 18, 2026 and Lung CT Field Guide on June 4, 2026.

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