# Unbroken Protocol vs Ramp4x4

The clearest difference is ads: Ramp4x4 at none against Unbroken Protocol's shown. Ramp4x4 also leads on update cadence (every 4 days vs fortnightly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Unbroken Protocol sells 1 in-app purchase, starting at $12.99 per month and Ramp4x4 sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Unbroken Protocol ships an update fortnightly, Ramp4x4 every 4 days. The most recent releases landed on October 19, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Unbroken Protocol | Ramp4x4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ramp4x4-vo2-max-trainer/id6768789400/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 290 MB | 52 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [ABRAHAM SPRING](https://appshunter.io/developer/1886724387) | [Archline Labs LLC](https://appshunter.io/developer/1896604874) |

## What reviewers say

### Unbroken Protocol

[App page](https://appshunter.io/ios/app/unbroken-protocol/id6760904488)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unbroken Membership | $12.99 | per month |


### Ramp4x4

[App page](https://appshunter.io/ios/app/ramp4x4-vo2-max-trainer/id6768789400)

This app guides you through high-intensity interval training sessions designed to improve your VO2 max. It offers live heart-rate feedback and timing for your workouts, with options for both free and premium training plans.

**Highlights:** Norwegian 4x4 interval workouts, Live heart-rate guidance, Apple Watch integration, Multiple training equipment options, Workout performance review, VO2 max estimate tracking

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ramp4x4+ Monthly | $9.99 | per month |
| Ramp4x4+ Yearly | $59.99 | per year |


## Frequently asked questions

### Is Unbroken Protocol free?

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

### Is Ramp4x4 free?

Ramp4x4 is free to download, with in-app purchases available.

### Do Unbroken Protocol or Ramp4x4 have ads?

Unbroken Protocol shows ads; Ramp4x4 does not.

### Which is updated more often, Unbroken Protocol or Ramp4x4?

Unbroken Protocol ships an update fortnightly, and Ramp4x4 every 4 days. Most recently, Unbroken Protocol was updated on October 19, 2026 and Ramp4x4 on October 23, 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.*