# CathSource vs Heart Chart

The clearest difference is rating: Heart Chart at 4.5 against CathSource's 1.6. Heart Chart also leads on review sentiment (75% vs 38%) and update cadence (every 3 days vs every 2 months). CathSource's advantage is in-app purchases (none vs 1) and ratings volume (23 vs 2). On price, ads and device support there is nothing between them.

Both are free to download. Heart Chart sells 1 in-app purchase, starting at $2.99 per year. CathSource asks for nothing beyond the download.

Heart Chart holds the better App Store score, 4.5 against 1.6. That said, the two scores are not equally well evidenced: CathSource has 23 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 38% of CathSource's written reviews are positive against 75% of Heart Chart's.

CathSource ships an update every 2 months, Heart Chart every 3 days. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | CathSource | Heart Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (23 ratings)](https://appshunter.io/ios/app/cathsource/id420847275/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/heart-chart/id566700808/reviews)** |
| Number of ratings | **23** | 2 |
| Positive reviews | 38.5% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Paid | **Freemium** |
| Size | 79 MB | 11 MB |
| Requires iOS | **18.5** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [ECGsource LLC](https://appshunter.io/developer/377139096) | [Bender Apps, LLC](https://appshunter.io/developer/1894916304) |

## 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


### Heart Chart

[App page](https://appshunter.io/ios/app/heart-chart/id566700808)

This app allows medical professionals to visually document cardiac surgery cases. Users can draw graft configurations, add procedures, and generate PDF summaries for review or sharing. It's designed for surgeons, trainees, and educators to illustrate operative concepts.

**Highlights:** Draw CABG graft configurations, Add associated procedures, Generate professional PDF case summaries, Save cases with subscription, Simple step-by-step workflow, Designed for clinical education

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HeartChart Premium | $2.99 | per year |


## Frequently asked questions

### Is CathSource free?

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

### Is Heart Chart free?

Heart Chart is free to download, with in-app purchases available.

### Which has better reviews, CathSource or Heart Chart?

Heart Chart is rated higher. CathSource averages 1.6 out of 5 from 23 ratings, while Heart Chart averages 4.5 from 2 ratings.

### Do CathSource or Heart Chart have ads?

Neither CathSource nor Heart Chart shows ads.

### Which is updated more often, CathSource or Heart Chart?

CathSource ships an update every 2 months, and Heart Chart every 3 days. Most recently, CathSource was updated on October 12, 2026 and Heart Chart on October 2, 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.*