# CathSource vs MCSAID

The clearest difference is update cadence: CathSource at every 2 months against MCSAID's every 40 months. MCSAID's advantage is iOS requirement (15.0 vs 18.5). On price, ads, 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.

CathSource ships an update every 2 months, MCSAID every 40 months. The most recent releases landed on September 18, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | CathSource | MCSAID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.6 (23 ratings)](https://appshunter.io/ios/app/cathsource/id420847275/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 40 months |
| Monetization | Paid | — |
| Size | 79 MB | 46 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | iPhone, 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


### MCSAID

[App page](https://appshunter.io/ios/app/mcsaid/id6443740248)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CathSource free?

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

### Is MCSAID free?

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

### Do CathSource or MCSAID have ads?

Neither CathSource nor MCSAID shows ads.

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

CathSource ships an update every 2 months, and MCSAID every 40 months. Most recently, CathSource was updated on September 18, 2026 and MCSAID on September 12, 2026.

---

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