# VO2 Max vs Train.Red APP

The clearest difference is rating: Train.Red APP at 5.0 against VO2 Max's 3.8. Train.Red APP also leads on in-app purchases (none vs 3) and iOS requirement (13.0 vs 18.0). VO2 Max's advantage is ratings volume (127 vs 1) and update cadence (every 10 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. VO2 Max sells 3 in-app purchases, starting at $2.99 per month. Train.Red APP asks for nothing beyond the download.

Train.Red APP holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: VO2 Max has 127 ratings behind it against 1, so its average is the more settled of the two.

VO2 Max ships an update every 10 days, Train.Red APP every 3 weeks. The most recent releases landed on September 21, 2026 and July 30, 2026 respectively.

## The numbers

| Metric | VO2 Max | Train.Red APP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (127 ratings)](https://appshunter.io/ios/app/vo2-max-widget-notifications/id1394840943/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/trainred-app/id6451237438/reviews)** |
| Number of ratings | **127** | 1 |
| Positive reviews | 26.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 101 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bernhard Hering](https://appshunter.io/developer/327542085) | [Train.Red B.V.](https://appshunter.io/developer/1646391181) |

## What reviewers say

### VO2 Max

[App page](https://appshunter.io/ios/app/vo2-max-widget-notifications/id1394840943)

Track your body's oxygen absorption at peak effort with detailed insights and performance estimates for running and cycling. Visualize trends, compare personal bests, and understand your cardio fitness level with a redesigned dashboard and Apple Watch integration.

**Highlights:** VO2 max estimation for running and cycling, Performance estimates (W/kg, FTP), Redesigned dashboard with trends and personal bests, Interactive charts with customizable date ranges, Apple Watch complications and iPhone widgets, Cardio fitness level comparison by age and sex

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.99 | per month |
| Yearly Subscription | $17.99 | per year |
| Lifetime Access | $79.99 | one-time |


### Train.Red APP

[App page](https://appshunter.io/ios/app/trainred-app/id6451237438)

This app monitors muscle oxygen saturation to provide real-time physiological insights for athletes and coaches. It helps optimize performance, track recovery, and analyze training data with actionable metrics.

**Highlights:** Muscle oxygen saturation monitoring, Real-time physiological insights, Performance and recovery tracking, Workout analysis and data export, Team/organization structure, Live data overlay

**In-app purchases:** none


## Frequently asked questions

### Is VO2 Max free?

VO2 Max is free to download, with in-app purchases available.

### Is Train.Red APP free?

Train.Red APP is free to download, with no in-app purchases.

### Which has better reviews, VO2 Max or Train.Red APP?

Train.Red APP is rated higher. VO2 Max averages 3.8 out of 5 from 127 ratings, while Train.Red APP averages 5.0 from 1 ratings.

### Do VO2 Max or Train.Red APP have ads?

Neither VO2 Max nor Train.Red APP shows ads.

### Which is updated more often, VO2 Max or Train.Red APP?

VO2 Max ships an update every 10 days, and Train.Red APP every 3 weeks. Most recently, VO2 Max was updated on September 21, 2026 and Train.Red APP on July 30, 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.*