# CardioBird vs NIR Watchdog

The clearest difference is iOS requirement: CardioBird at 13.0 against NIR Watchdog's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CardioBird ships an update every 5 weeks, NIR Watchdog every 2 months. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CardioBird | NIR Watchdog |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 54 MB | 27 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ANIWARE Company Limited](https://appshunter.io/developer/1403688562) | [NIR WATCHDOG SARL-S](https://appshunter.io/developer/1868501121) |

## What reviewers say

### CardioBird

[App page](https://appshunter.io/ios/app/cardiobird/id1576036995)

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

**In-app purchases:** none


### NIR Watchdog

[App page](https://appshunter.io/ios/app/nir-watchdog/id6757719271)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CardioBird free?

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

### Is NIR Watchdog free?

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

### Do CardioBird or NIR Watchdog have ads?

Neither CardioBird nor NIR Watchdog shows ads.

### Which is updated more often, CardioBird or NIR Watchdog?

CardioBird ships an update every 5 weeks, and NIR Watchdog every 2 months. Most recently, CardioBird was updated on October 2, 2026 and NIR Watchdog on October 10, 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.*