# VO2 Max Trainer vs Croton

The clearest difference is iOS requirement: Croton at 15.1 against VO2 Max Trainer's 18.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. VO2 Max Trainer sells 10 in-app purchases, starting at $1.99 per 7 days and Croton sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

VO2 Max Trainer ships an update weekly, Croton every 4 days. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | VO2 Max Trainer | Croton |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/vo2-max-trainer-hiit-zone-2/id6736629740/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Freemium | — |
| Size | 124 MB | 36 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kevin Floch](https://appshunter.io/developer/1772752224) | [Jahangir Erfan](https://appshunter.io/developer/1806862275) |

## What reviewers say

### VO2 Max Trainer

[App page](https://appshunter.io/ios/app/vo2-max-trainer-hiit-zone-2/id6736629740)

Measure your VO2 max accurately and improve endurance with personalized Zone 2 and HIIT workouts. Compete globally on a verified leaderboard and track progress with live activities and widgets.

**Highlights:** VO2 max measurement (Beep, Cooper, Yo-Yo tests), Personalized Zone 2 and HIIT workouts, Ghost racing for tests, Global leaderboard with verified results, Live Activities and widgets, AI coach and training plans, Heart rate and lactate threshold estimation

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VO2_Weekly | $1.99 | per 7 days |
| VO2_Monthly | $1.99 | per month |
| VO2_Annually_Offer | $14.99 | per year |
| VO2_Annually | $29.99 | per year |
| Small tip | $4.99 | one-time |
| Medium tip | $9.99 | one-time |
| Large tip | $19.99 | one-time |
| VO2_Lifetime_Upgrade2 | $24.99 | one-time |
| Extra large tip | $39.99 | one-time |
| VO2_Lifetime2 | $49.99 | one-time |


### Croton

[App page](https://appshunter.io/ios/app/croton-workout-tracker/id6758462543)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $49.99 | per year |
| Pro Lifetime | $69.99 | one-time |


## Frequently asked questions

### Is VO2 Max Trainer free?

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

### Is Croton free?

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

### Do VO2 Max Trainer or Croton have ads?

Neither VO2 Max Trainer nor Croton shows ads.

### Which is updated more often, VO2 Max Trainer or Croton?

VO2 Max Trainer ships an update weekly, and Croton every 4 days. Most recently, VO2 Max Trainer was updated on November 4, 2026 and Croton on November 5, 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.*