# CathSource vs HepCalc

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.

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.

## The numbers

| Metric | CathSource | HepCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (23 ratings)](https://appshunter.io/ios/app/cathsource/id420847275/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/hepcalc/id586813135/reviews)** |
| Number of ratings | **23** | 9 |
| Positive reviews | 42.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | **Free** |
| Size | 79 MB | 14 MB |
| Requires iOS | 18.5 | **17.5** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [ECGsource LLC](https://appshunter.io/developer/377139096) | [Gary Poleynard MD](https://appshunter.io/developer/586813138) |

## What reviewers say

### CathSource

[App page](https://appshunter.io/ios/app/cathsource/id420847275)

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:** macOS Compatibility

**In-app purchases:** none


### HepCalc

[App page](https://appshunter.io/ios/app/hepcalc/id586813135)

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.

**Highlights:** Liver-related calculators, Preserves entry data, Customizable web links, Editable clinical notes, U.S. - SI units conversion, Integrated web references

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CathSource free?

CathSource is free to download, with no in-app purchases.

### Is HepCalc free?

HepCalc is free to download, with no in-app purchases.

### Which has better reviews, CathSource or HepCalc?

HepCalc is rated higher. CathSource averages 1.6 out of 5 from 23 ratings, while HepCalc averages 5.0 from 9 ratings.

### Do CathSource or HepCalc have ads?

Neither CathSource nor HepCalc shows ads.

### Which is updated more often, CathSource or HepCalc?

CathSource ships an update every 2 months, and HepCalc every 2 months. Most recently, CathSource was updated on September 18, 2026 and HepCalc on June 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*