CathSource vs HepCalc
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.
HepCalc
This medical app provides a comprehensive suite of liver-related calculators, web links, and clinical notes. It preserves entry data across calculators and allows for customization of web links and notes, making it a valuable tool for clinicians managing liver disease.
- Liver-related calculators
- Preserves entry data
- Customizable web links
- Editable clinical notes
- U.S. - SI units conversion
- Integrated web references
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HepCalc is a collection of liver related calculators, web links, resources, and editable web links and clinical notes. ◆ Unlike most calculators, entry data is preserved between different calculators limiting the need for reentry of data. ◆ Set your own favorite web links ◆ Save clinical notes, clinical "pearls" in a organized fashion ◆ Integrated U.S. - SI units conversion ◆ Each calculator has a related web reference A must have for the clinician/house officer dealing with liver disease. The customizable WebLinks and Clinical Notes sections alone are valuable tools for anyone. Child-Pugh Score MELD (UNOS) -survival data -TIPS recommendations MELD MELD Sodium (UNOS) MELD 3.0/Survival Alcoholic Hepatitis Calculators: - ABIC -Combined: Lille Model +(MELD, Maddrey DF, ABIC) - Glasgow - Lille Model - Lille Model Projection (using day 0 of Rx, calculates decision making for bilirubin values on day 7) - Maddrey Discriminant Function - MELD alcoholic hepatitis score ( Includes survival percentage) Autoimmune Liver Disease Calculators: -Autoimmune hepatitis Score(1999 International AIH Group Report) -Autominnune hepatitis Simplified Score -AIH/PBC overlap (Paris Criteria) -PBC Survival Mayo GLOBE UK-PBC -PSC Survival Fibrosis Calculators: - APRI Fibrosis Score - FAST (Fibroscan™ + AST) Score - FIB4 Fibrosis Score - FORNS Fibrosis Score - HALT-C Cirrhosis Score - NAFLD Fibrosis Score -SAFE Fibrosis Score (Steatosis-associated Fibrosis Estimate) Risk Assessment Calculators: Liver Decompensation - Acute decompensation without ACLF: CLIF-C AD score and mortality -Acute liver failure - transplant free survival at 21 days - Acute on Chronic Liver Failure AARC score and mortality - Acute on Chronic Liver Failure CLIF-C ACLF score and mortality - Acute on Chronic Liver Failure NACSELD 30 day mortality - BE3A Score: Hep C DAA assessment for decompensated cirrhosis - Decompensation Risk - Hep C -TAM Score: 1 yr post transplant survival for ACLF-3 patients HCC Risk Hep B - HCC Risk Hep B: CHUK - HCC Risk Hep B: REACH B - HCC Risk Hep B on Rx (entecavir, tenofovir): PAGE B HCC Risk Hep C - HCC Risk Hep C : HALT-C - HCC Risk in Chronic Liver Disease: GALAD/GALADUS Other Risks -BEA Score: Baseline event anticipation for Hepatitis Deta -Cardiovascular Risk (CAD-LT): CV risk in LT candidates - CAR-OLT: 1 yr risk of cardiovascular event post OLT -Dili Mortality Risk: 6 mos mortality risk and comorbidity burden - Fungal Infection Risk - NACSELD - RUCAM for DILI assessment - Surgical Risk Cirrhosis: post op mortality major surgery -Surgical Risk Cirrhosis: VOCAL-Penn Score Other Calculators: -ANI (differentiate between alcoholic and non-alcoholic steatohepatitis) -Ascites, refractory -estimate ascites to be gained based on serum sodium and time passed -estimate sodium intake based on serum sodium and ascites gained -Body Mass Index - Portopulmonary Hypertension Calculator: - Pulmonary Vascular Resistance Calculator -diagnostic and UNOS transplant Criteria -HCV treatment tracker (calculates dates for end of Rx and SVR) -Mean arterial pressure -Wilson's Disease: EASL scoring system WebLinks: - Hepatology Societies - Hepatology Organizations - Other Resources (i.e. Drug Hepatoxicity, Hepatitis Rx drug interactions, etc) - Custom WebLinks (make your own links for reference, frequently used, etc.) Clinical Notes: - Create a title and store clinical information, pearls, or any other text for quick ready reference in one place - Can cut and paste from other text for ease of entry of your clinical data
Screenshots
Verdict
The clearest difference is review sentiment: HepCalc at 100% against CathSource's 43%. HepCalc also leads on rating (5.0 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
HepCalc holds the better App Store score, 5.0 against 1.6. Both are backed by a comparable volume of ratings — 23 and 9 respectively. Written reviews point the same way: 43% of CathSource's written reviews are positive against 100% of HepCalc's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 18, 2026 and June 1, 2026 respectively.
| Parameter | CathSource | HepCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 1.6 (23 ratings) | 5.0 (9 ratings) — better |
| Positive reviews | 42.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 23 — better | 9 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.5 | 17.5 — better |
| Further details — not scored | ||
| Size | 79 MB | 14 MB |
| Age rating | 12+ | 17+ |
| Developer | ECGsource LLC | Gary Poleynard MD |
Customer experience
CathSource
HepCalc
In-app purchases
CathSource
No in-app purchases
HepCalc
No in-app purchases









