# Vo2max靜態推算 vs ChironMotion IMU

The clearest difference is in-app purchases: Vo2max靜態推算 at none against ChironMotion IMU's 2. Vo2max靜態推算 also leads on iOS requirement (16.0 vs 18.0). ChironMotion IMU's advantage is update cadence (every 2 months vs every 14 months). On price, ads and device support there is nothing between them.

Both are free to download. ChironMotion IMU sells 2 in-app purchases, starting at $3.99 per month. Vo2max靜態推算 asks for nothing beyond the download.

Vo2max靜態推算 ships an update every 14 months, ChironMotion IMU every 2 months. The most recent releases landed on October 5, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Vo2max靜態推算 | ChironMotion IMU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 2 months** |
| Size | 3 MB | 21 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Shun Man Leung](https://appshunter.io/developer/1684190351) | [Yi-Fu Chen](https://appshunter.io/developer/1873701789) |

## What reviewers say

### Vo2max靜態推算

[App page](https://appshunter.io/ios/app/vo2max/id6745766162)

**Features:** macOS Compatibility

**In-app purchases:** none


### ChironMotion IMU

[App page](https://appshunter.io/ios/app/chironmotion-imu/id6758951844)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Plan | $3.99 | per month |
| Pro Yearly Plan | $39.99 | per year |


## Frequently asked questions

### Is Vo2max靜態推算 free?

Vo2max靜態推算 is free to download, with no in-app purchases.

### Is ChironMotion IMU free?

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

### Do Vo2max靜態推算 or ChironMotion IMU have ads?

Neither Vo2max靜態推算 nor ChironMotion IMU shows ads.

### Which is updated more often, Vo2max靜態推算 or ChironMotion IMU?

Vo2max靜態推算 ships an update every 14 months, and ChironMotion IMU every 2 months. Most recently, Vo2max靜態推算 was updated on October 5, 2026 and ChironMotion IMU on October 16, 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.*