# CathSource vs IVUSAID

The clearest difference is rating: IVUSAID at 5.0 against CathSource's 1.6. IVUSAID also leads on monetization model (ad-supported vs paid) and iOS requirement (15.0 vs 18.5). CathSource's advantage is ads (none vs shown) and update cadence (every 2 months vs every 18 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

IVUSAID holds the better App Store score, 5.0 against 1.6. That said, the two scores are not equally well evidenced: CathSource has 23 ratings behind it against 1, so its average is the more settled of the two.

CathSource ships an update every 2 months, IVUSAID every 18 months. The most recent releases landed on September 18, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | CathSource | IVUSAID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (23 ratings)](https://appshunter.io/ios/app/cathsource/id420847275/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ivusaid/id6447531663/reviews)** |
| Number of ratings | **23** | 1 |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 18 months |
| Monetization | Paid | **Ad-supported** |
| Size | 79 MB | 80 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [ECGsource LLC](https://appshunter.io/developer/377139096) | [Cardiology Apps LLC](https://appshunter.io/developer/1639925847) |

## 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


### IVUSAID

[App page](https://appshunter.io/ios/app/ivusaid/id6447531663)

This free educational app teaches medical professionals how to use intravascular ultrasound (IVUS) for PCI guidance. It features interactive lessons, image interpretation tools, and complex case studies to overcome barriers to IVUS adoption.

**Highlights:** IVUS principles and image acquisition, Image interpretation with videos and descriptions, Complex coronary case studies, Interactive quiz section with explanations, PCI guidance for stent sizing and optimization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CathSource free?

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

### Is IVUSAID free?

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

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

IVUSAID is rated higher. CathSource averages 1.6 out of 5 from 23 ratings, while IVUSAID averages 5.0 from 1 ratings.

### Do CathSource or IVUSAID have ads?

IVUSAID shows ads; CathSource does not.

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

CathSource ships an update every 2 months, and IVUSAID every 18 months. Most recently, CathSource was updated on September 18, 2026 and IVUSAID on June 4, 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.*