# CathSource vs HEART

The clearest difference is rating: HEART at 3.7 against CathSource's 1.6. HEART also leads on iOS requirement (9.0 vs 18.5). CathSource's advantage is in-app purchases (none vs 8) and update cadence (every 2 months vs every 21 months). On price, ads and device support there is nothing between them.

Both are free to download. HEART sells 8 one-off in-app purchases. CathSource asks for nothing beyond the download.

HEART holds the better App Store score, 3.7 against 1.6. That said, the two scores are not equally well evidenced: CathSource has 23 ratings behind it against 3, so its average is the more settled of the two.

CathSource ships an update every 2 months, HEART every 21 months. The most recent releases landed on October 12, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | CathSource | HEART |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (23 ratings)](https://appshunter.io/ios/app/cathsource/id420847275/reviews) | **[3.7 (3 ratings)](https://appshunter.io/ios/app/heart-digital-anatomy/id956150836/reviews)** |
| Number of ratings | **23** | 3 |
| Positive reviews | 38.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 21 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 79 MB | 55 MB |
| Requires iOS | 18.5 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [ECGsource LLC](https://appshunter.io/developer/377139096) | [Focus Medica](https://appshunter.io/developer/508294531) |

## 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

[App page](https://appshunter.io/ios/app/heart-digital-anatomy/id956150836)

Explore the human heart with this comprehensive 3D digital anatomy atlas. It offers detailed interactive images, animations, and clinical perspectives to enhance understanding of cardiac structures and functions. Ideal for learning and teaching cardiovascular anatomy.

**Highlights:** 3D animated anatomy, Interactive labeled images, Clinical perspectives, Detailed anatomical descriptions, Zoom-in/out functionality, Audio narration

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pericardium - Digital Atlas | $2.99 | one-time |
| Heart External surface - Digital Atlas | $2.99 | one-time |
| Heart Chambers-Digital Atlas | $2.99 | one-time |
| Valves of the heart - Digital Atlas | $2.99 | one-time |
| Coronary circulation - Digital Atlas | $2.99 | one-time |
| Venous drainage - Digital Atlas | $2.99 | one-time |
| Conducting System of the Heart - Digital Atlas | $2.99 | one-time |
| Digital Atlas - Buy All | $12.99 | one-time |


## Frequently asked questions

### Is CathSource free?

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

### Is HEART free?

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

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

HEART is rated higher. CathSource averages 1.6 out of 5 from 23 ratings, while HEART averages 3.7 from 3 ratings.

### Do CathSource or HEART have ads?

Neither CathSource nor HEART shows ads.

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

CathSource ships an update every 2 months, and HEART every 21 months. Most recently, CathSource was updated on October 12, 2026 and HEART on October 15, 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.*