# CathSource vs epTools

The clearest difference is review sentiment: epTools at 88% against CathSource's 40%. epTools also leads on rating (4.8 vs 1.6) and ratings volume (521 vs 24). CathSource's advantage is price (Free vs $19.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

CathSource is free to download; epTools costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

epTools holds the better App Store score, 4.8 against 1.6. That said, the two scores are not equally well evidenced: epTools has 521 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 88% of epTools's.

CathSource ships an update every 2 months, epTools every 4 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | CathSource | epTools |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| Rating | [1.6 (24 ratings)](https://appshunter.io/ios/app/cathsource/id420847275/reviews) | **[4.8 (521 ratings)](https://appshunter.io/ios/app/eptools/id430201878/reviews)** |
| Number of ratings | 24 | **521** |
| Positive reviews | 40.0% of reviews | **88.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Paid | **Free** |
| Size | 79 MB | 30 MB |
| Requires iOS | 18.5 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [ECGsource LLC](https://appshunter.io/developer/377139096) | [Busy Being Born Solutions, LLC](https://appshunter.io/developer/430201881) |

## 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, Vision Pro support

**In-app purchases:** none


### epTools

[App page](https://appshunter.io/ios/app/eptools/id430201878)

This app provides a suite of tools for diagnosing and managing cardiac rhythm disorders. It offers algorithms for localizing arrhythmias, differentiating conditions like WPW from FVF, and assessing disease risks. Users can visualize progress, save analysis paths, and access cited scientific references.

**Highlights:** Arrhythmia localization algorithms, Differentiate WPW from FVF, Atrial tachycardia localization, Ventricular tachycardia localization, Disease assessment criteria, Save decision path images, Access scientific references

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 👍 Very useful for EP issues
- 👍 Great for remembering rules
- 👍 Gold standard EP app
- 👍 Helpful for decision making

**What reviewers complain about**

- 😐 Not as great as expected
- 😐 Needs more explanations

**Reported bugs**

- Crash problem fixed

**Requested features**

- Add CAAP-AF
- Better tools for PVC localization
- More explanations in each pathway
- German translation
- Links to papers with algorithms


## Frequently asked questions

### Is CathSource free?

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

### Is epTools free?

epTools costs $19.99, with no in-app purchases.

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

epTools is rated higher. CathSource averages 1.6 out of 5 from 24 ratings, while epTools averages 4.8 from 521 ratings.

### Do CathSource or epTools have ads?

Neither CathSource nor epTools shows ads.

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

CathSource ships an update every 2 months, and epTools every 4 months. Most recently, CathSource was updated on November 1, 2026 and epTools on November 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.*