CathSource vs Lung CT Field Guide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- 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
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | CathSource | Lung CT Field Guide |
|---|---|---|
| Price | Free | Free |
| Rating | 1.6 (23 ratings) | 5.0 (11 ratings) — better |
| Positive reviews | 42.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 23 — better | 11 |
| Update frequency | Every 2 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 8.0 — better |
| Further details — not scored | ||
| Size | 79 MB | 58 MB |
| Age rating | 12+ | 12+ |
| Developer | ECGsource LLC | RADIOLOGiQ, LLC |
Customer experience
CathSource
Lung CT Field Guide
In-app purchases
CathSource
No in-app purchases
Lung CT Field Guide
No in-app purchases
Questions
Is CathSource free?
Is Lung CT Field Guide free?
Which has better reviews, CathSource or Lung CT Field Guide?
Do CathSource or Lung CT Field Guide have ads?
Which is updated more often, CathSource or Lung CT Field Guide?
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