# CARDIO vs ECG Audio

The clearest difference is in-app purchases: CARDIO at none against ECG Audio's 1. CARDIO also leads on update cadence (monthly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ECG Audio sells 1 one-off in-app purchase. CARDIO asks for nothing beyond the download.

CARDIO ships an update monthly, ECG Audio every 2 months. The most recent releases landed on October 18, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | CARDIO | ECG Audio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Size | 2 MB | 21 MB |
| Requires iOS | 12.3 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [CardioQVARK, OOO](https://appshunter.io/developer/1320898121) | [Nordavind](https://appshunter.io/developer/637520063) |

## What reviewers say

### CARDIO

[App page](https://appshunter.io/ios/app/cardio/id1478409159)

**In-app purchases:** none


### ECG Audio

[App page](https://appshunter.io/ios/app/ecg-audio/id1541142830)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full app version | $0.99 | one-time |


## Frequently asked questions

### Is CARDIO free?

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

### Is ECG Audio free?

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

### Do CARDIO or ECG Audio have ads?

Neither CARDIO nor ECG Audio shows ads.

### Which is updated more often, CARDIO or ECG Audio?

CARDIO ships an update monthly, and ECG Audio every 2 months. Most recently, CARDIO was updated on October 18, 2026 and ECG Audio on October 19, 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.*