# Cardio Conversion vs Peak Intervals

The clearest difference is iOS requirement: Cardio Conversion at 15.1 against Peak Intervals's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Cardio Conversion sells 1 one-off in-app purchase and Peak Intervals sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Cardio Conversion ships an update weekly, Peak Intervals every 4 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Cardio Conversion | Peak Intervals |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Size | 33 MB | 19 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [Ryan Rodemoyer](https://appshunter.io/developer/1738774695) | [Justin Polidori](https://appshunter.io/developer/1866410754) |

## What reviewers say

### Cardio Conversion

[App page](https://appshunter.io/ios/app/cardio-conversion/id6480349250)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Unlock | $4.99 | one-time |


### Peak Intervals

[App page](https://appshunter.io/ios/app/peak-intervals-norwegian-4x4/id6757667069)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $49.99 | per year |


## Frequently asked questions

### Is Cardio Conversion free?

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

### Is Peak Intervals free?

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

### Do Cardio Conversion or Peak Intervals have ads?

Neither Cardio Conversion nor Peak Intervals shows ads.

### Which is updated more often, Cardio Conversion or Peak Intervals?

Cardio Conversion ships an update weekly, and Peak Intervals every 4 days. Most recently, Cardio Conversion was updated on November 4, 2026 and Peak Intervals on October 31, 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.*