# Ramp4x4 vs Stellar Intervals

The clearest difference is in-app purchases: Stellar Intervals at none against Ramp4x4's 2. Stellar Intervals also leads on iOS requirement (15.1 vs 17.0). Ramp4x4's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Ramp4x4 sells 2 in-app purchases, starting at $9.99 per month. Stellar Intervals asks for nothing beyond the download.

## The numbers

| Metric | Ramp4x4 | Stellar Intervals |
| --- | --- | --- |
| 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 | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | — |
| Monetization | Freemium | — |
| Size | 42 MB | 41 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Archline Labs LLC](https://appshunter.io/developer/1896604874) | [Garage Projects AB](https://appshunter.io/developer/6774685578) |

## What reviewers say

### 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 |


### Stellar Intervals

[App page](https://appshunter.io/ios/app/stellar-intervals/id6774685576)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ramp4x4 free?

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

### Is Stellar Intervals free?

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

### Do Ramp4x4 or Stellar Intervals have ads?

Stellar Intervals shows ads; Ramp4x4 does not.

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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.*