# OxyBoost vs KneeFix

The clearest difference is in-app purchases: KneeFix at none against OxyBoost's 3. KneeFix also leads on iOS requirement (17.0 vs 26.2). OxyBoost's advantage is update cadence (every 2 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. OxyBoost sells 3 in-app purchases, starting at $1.99 per month. KneeFix asks for nothing beyond the download.

OxyBoost ships an update every 2 days, KneeFix every 2 months. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | OxyBoost | KneeFix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 months |
| Size | 24 MB | 8 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Artem Verbat](https://appshunter.io/developer/1787150868) | [Ingenuity Labs LLC](https://appshunter.io/developer/1808422427) |

## What reviewers say

### OxyBoost

[App page](https://appshunter.io/ios/app/oxyboost-apnea-trainer/id6739809272)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $1.99 | per month |
| Pro (Yearly) | $11.99 | per year |
| Pro (Yearly) | $19.99 | per year |


### KneeFix

[App page](https://appshunter.io/ios/app/kneefix/id6793325276)

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

**In-app purchases:** none


## Frequently asked questions

### Is OxyBoost free?

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

### Is KneeFix free?

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

### Do OxyBoost or KneeFix have ads?

Neither OxyBoost nor KneeFix shows ads.

### Which is updated more often, OxyBoost or KneeFix?

OxyBoost ships an update every 2 days, and KneeFix every 2 months. Most recently, OxyBoost was updated on November 8, 2026 and KneeFix 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.*