# VO2 Master Manager vs BIOS Kotton MD

VO2 Master Manager and BIOS Kotton MD are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | VO2 Master Manager | BIOS Kotton MD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (9 ratings)](https://appshunter.io/ios/app/vo2-master-manager/id936519055/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free | — |
| Size | 88 MB | 63 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [VO2 MASTER HEALTH SENSORS INC](https://appshunter.io/developer/936519054) | [EndoMedical Inc](https://appshunter.io/developer/1290814301) |

## What reviewers say

### VO2 Master Manager

[App page](https://appshunter.io/ios/app/vo2-master-manager/id936519055)

This tool collects and displays performance data including VO2, heart rate, and power. It also monitors speed, cadence, and muscle oxygenation for comprehensive analysis.

**Highlights:** VO2 monitoring, Heart rate tracking, Power data collection, Speed and cadence monitoring, Muscle oxygenation data, Performance analysis

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### BIOS Kotton MD

[App page](https://appshunter.io/ios/app/bios-kotton-md/id6748883198)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is VO2 Master Manager free?

VO2 Master Manager is free to download, with no in-app purchases.

### Is BIOS Kotton MD free?

BIOS Kotton MD is free to download, with no in-app purchases.

### Do VO2 Master Manager or BIOS Kotton MD have ads?

Neither VO2 Master Manager nor BIOS Kotton MD shows ads.

### Which is updated more often, VO2 Master Manager or BIOS Kotton MD?

VO2 Master Manager ships an update monthly, and BIOS Kotton MD monthly. Most recently, VO2 Master Manager was updated on November 1, 2026 and BIOS Kotton MD on October 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.*