# CardioEngine vs Open Feelings

The clearest difference is in-app purchases: Open Feelings at none against CardioEngine's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CardioEngine sells 1 one-off in-app purchase. Open Feelings asks for nothing beyond the download.

## The numbers

| Metric | CardioEngine | Open Feelings |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Size | 9 MB | 4 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Nicholas Prokesch](https://appshunter.io/developer/1716689922) | [Taylor Finklea](https://appshunter.io/developer/1886998743) |

## What reviewers say

### CardioEngine

[App page](https://appshunter.io/ios/app/cardioengine-hr-zone-training/id6761030036)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CardioEngine Full Access | $29.99 | one-time |


### Open Feelings

[App page](https://appshunter.io/ios/app/open-feelings/id6766533356)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CardioEngine free?

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

### Is Open Feelings free?

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

### Do CardioEngine or Open Feelings have ads?

Neither CardioEngine nor Open Feelings shows ads.

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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.*