Comparison

CathSource vs STS Cardiothoracic Surgery

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

STS Cardiothoracic Surgery

This app is a comprehensive digital resource for cardiothoracic surgical information, offering updated content in cardiac and thoracic surgery. It features extensive multimedia, including illustrations, photographs, and surgical videos, for educational and reference purposes.

Highlights
  • Continuously updated surgical information
  • Multimedia content: illustrations, photos, videos
  • Covers general thoracic and cardiac surgery
  • Accessible on mobile devices 24/7
  • Interactive chapters
  • Based on leading textbooks and surgeon expertise
Features
Read full description

STS Cardiothoracic Surgery Consult is the most complete and authoritative digital resource of cardiothoracic surgical information in the world. It provides a rich, multimedia educational experience that includes regularly updated content in cardiac surgery (adult cardiac and congenital) and general thoracic surgery. This comprehensive resource includes more than 500 high-quality, hand-drawn medical illustrations, plus over 2000 photographs, tables and surgical videos. It is accessible anytime, anywhere on your mobile devices. STS Cardiothoracic Surgery Consult includes the following sections: • Pearson’s General Thoracic Surgery ◦ Esophageal ◦ Thoracic • Adult and Pediatric Cardiac Surgery ◦ Adult Cardiac ◦ Pediatric and Congenital (coming soon!) FEATURES: • The most current, continuously updated resource available in the specialty, authored and edited by the leading surgeons from around the world • Rich, multimedia content with high-quality medical illustrations and surgical videos • Online and mobile platforms offering home, office, or point-of-care reference 24/7/365 • Comprehensive collection of 330+ interactive chapters in all main cardiothoracic surgery domains • Updated and expanded of the popular Pearson’s Thoracic textbook for general thoracic surgery • Newly written content for adult cardiac and congenital • Cornerstone of the CT surgery curriculum in training programs throughout the US (the curriculum includes additional educational activities, nationally benchmarked quizzes and self-assessment, progress reports) • Much-needed resource outside of the US where no like product currently exists Senior Editors: Jeffrey P. Jacobs, MD, University of Florida; Shari L. Meyerson, MD, MEd, University of Kentucky; Nanush A. Mokadam, MD, Ohio State University PUBLISHER: The Society of Thoracic Surgeons POWERED BY: Unbound Medicine, Inc. How It Works: --------------------- • Install the app on your device. • Open the app, enter your Society of Thoracic Surgeons username and password, then tap “Login.” • The latest content will be downloaded to your devices over your wireless connection.

Screenshots

CathSource4 screens
STS Cardiothoracic Surgery4 screens

Verdict

The call

The clearest difference is rating: STS Cardiothoracic Surgery at 4.8 against CathSource's 1.6. STS Cardiothoracic Surgery also leads on monetization model (free with in-app purchases vs paid) and ratings volume (205 vs 24). 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

STS Cardiothoracic Surgery holds the better App Store score, 4.8 against 1.6. That said, the two scores are not equally well evidenced: STS Cardiothoracic Surgery has 205 ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 40% of CathSource's written reviews are positive against 50% of STS Cardiothoracic Surgery's.

UpkeepUpdate frequency

CathSource ships an update every 2 months, STS Cardiothoracic Surgery every 4 months. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

Scorecard6 real differences · 4 level
CathSource versus STS Cardiothoracic Surgery: the parameters behind the verdict, then further details
ParameterCathSourceSTS Cardiothoracic Surgery
PriceFreeFree
Rating1.6 (24 ratings)4.8 (205 ratings) — better
Positive reviews40.0% of reviews50.0% of reviews — better
Number of ratings24205 — better
Update frequencyEvery 2 months — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS18.515.0 — better
Further details — not scored
Size79 MB14 MB
Age rating12+17+
DeveloperECGsource LLCUnbound Medicine, Inc.

Customer experience

CathSource

All ratings24 ratings
Positive8.3%
Neutral12.5%
Negative79.2%
Written reviews40 reviews
Positive40.0%
Neutral7.5%
Negative52.5%

STS Cardiothoracic Surgery

All ratings205 ratings
Positive97.1%
Neutral0.5%
Negative2.4%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

CathSource

No in-app purchases

None

STS Cardiothoracic Surgery

No in-app purchases

Questions

Is CathSource free?
CathSource is free to download, with no in-app purchases.
Is STS Cardiothoracic Surgery free?
STS Cardiothoracic Surgery is free to download, with no in-app purchases.
Which has better reviews, CathSource or STS Cardiothoracic Surgery?
STS Cardiothoracic Surgery is rated higher. CathSource averages 1.6 out of 5 from 24 ratings, while STS Cardiothoracic Surgery averages 4.8 from 205 ratings.
Do CathSource or STS Cardiothoracic Surgery have ads?
Neither CathSource nor STS Cardiothoracic Surgery shows ads.
Which is updated more often, CathSource or STS Cardiothoracic Surgery?
CathSource ships an update every 2 months, and STS Cardiothoracic Surgery every 4 months. Most recently, CathSource was updated on October 29, 2026 and STS Cardiothoracic Surgery on October 22, 2026.

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