# CapnoTrainer vs PrO2+

The clearest difference is iOS requirement: CapnoTrainer at 13.0 against PrO2+'s 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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 every 3 weeks. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | CapnoTrainer | PrO2+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pro2-plus/id6757462419/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | — | Free |
| Size | 54 MB | 6 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Muhammad Arshad Khan](https://appshunter.io/developer/1617354083) | [PrO2HEALTH](https://appshunter.io/developer/909203686) |

## What reviewers say

### CapnoTrainer

[App page](https://appshunter.io/ios/app/capnotrainer/id1617354081)

**Features:** macOS Compatibility

**In-app purchases:** none


### PrO2+

[App page](https://appshunter.io/ios/app/pro2-plus/id6757462419)

This app connects to respiratory muscle trainer devices to measure and improve breathing strength. It's designed for individuals looking to enhance respiratory performance through guided training sessions. Consult a physician if you have respiratory health conditions before use.

**Highlights:** Respiratory muscle training, Breathing strength assessment, Resisted breathing measurements, Performance improvement tracking, Device connectivity

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

**In-app purchases:** none


## Frequently asked questions

### Is CapnoTrainer free?

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

### Is PrO2+ free?

PrO2+ is free to download, with no in-app purchases.

### Do CapnoTrainer or PrO2+ have ads?

Neither CapnoTrainer nor PrO2+ shows ads.

### Which is updated more often, CapnoTrainer or PrO2+?

CapnoTrainer ships an update every 3 weeks, and PrO2+ every 3 weeks. Most recently, CapnoTrainer was updated on September 29, 2026 and PrO2+ on October 6, 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.*