# HRV4Training vs CapnoTrainer

The clearest difference is price: CapnoTrainer at Free against HRV4Training's $9.99. CapnoTrainer also leads on update cadence (every 3 weeks vs every 6 weeks) and iOS requirement (13.0 vs 15.6). HRV4Training's advantage is chart position (#26 vs unranked). On ads, in-app purchases and device support there is nothing between them.

CapnoTrainer is free to download; HRV4Training costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HRV4Training ships an update every 6 weeks, CapnoTrainer every 3 weeks. The most recent releases landed on October 15, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | HRV4Training | CapnoTrainer |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[3.6 (288 ratings)](https://appshunter.io/ios/app/hrv4training/id686923970/reviews)** | — |
| Number of ratings | **288** | — |
| Positive reviews | 61.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Paid | — |
| Best chart rank | **#26** | — |
| Size | 35 MB | 54 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [A.S.M.A. B.V.](https://appshunter.io/developer/1066843463) | [Muhammad Arshad Khan](https://appshunter.io/developer/1617354083) |

## What reviewers say

### HRV4Training

[App page](https://appshunter.io/ios/app/hrv4training/id686923970)

**Currently charting:** #26 Top Paid · Health & Fitness (US App Store)

Quantify stress, balance training and lifestyle, and improve performance with scientifically validated heart rate variability insights. This app accurately assesses HRV using your phone's camera or compatible devices, offering actionable interpretations for optimizing your training plan.

**Highlights:** HRV-based stress quantification, Training and lifestyle balance, Performance improvement insights, Camera-based HRV assessment, Integration with wearables, Training load analysis, VO2max and Lactate Threshold estimation

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate HRV measurements
- 🚀 Straightforward and easy to use
- 💡 Provides valuable insights for training and recovery
- 👍 Integrates well with other fitness apps
- 👍 Responsive and helpful developer support

**What reviewers complain about**

- 🐛 Inconsistent readings and technical issues
- 🔒 Requires user account and data sharing
- 🔒 Concerns about data privacy
- 🔋 Drains battery when using camera for measurements

**Reported bugs**

- App crashes frequently, especially with iOS updates
- Syncing issues with Strava, TrainingPeaks, and Apple Health
- Camera-based measurements often unreliable or inconsistent

**Requested features**

- Allow multiple measurements per day
- Improve integration with Apple Watch and other wearables
- Add more customization options and data visualization
- Expand support for non-athletic use cases


### CapnoTrainer

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HRV4Training free?

HRV4Training costs $9.99, with no in-app purchases.

### Is CapnoTrainer free?

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

### Do HRV4Training or CapnoTrainer have ads?

Neither HRV4Training nor CapnoTrainer shows ads.

### Which is updated more often, HRV4Training or CapnoTrainer?

HRV4Training ships an update every 6 weeks, and CapnoTrainer every 3 weeks. Most recently, HRV4Training was updated on October 15, 2026 and CapnoTrainer on September 29, 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.*