# HRV4Training vs GroundApp

The clearest difference is price: GroundApp at Free against HRV4Training's $9.99. GroundApp also leads on rating (5.0 vs 3.6) and review sentiment (100% vs 61%). HRV4Training's advantage is in-app purchases (none vs 1) and ratings volume (288 vs 11). On ads and device support there is nothing between them.

GroundApp is free to download; HRV4Training costs $9.99 up front. GroundApp sells 1 in-app purchase, starting at $29.99 per year. HRV4Training asks for nothing beyond the download.

GroundApp holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: HRV4Training has 288 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 61% of HRV4Training's written reviews are positive against 100% of GroundApp's.

HRV4Training ships an update every 6 weeks, GroundApp every 2 days. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | HRV4Training | GroundApp |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [3.6 (288 ratings)](https://appshunter.io/ios/app/hrv4training/id686923970/reviews) | **[5.0 (11 ratings)](https://appshunter.io/ios/app/groundapp-breathwork/id6760352779/reviews)** |
| Number of ratings | **288** | 11 |
| Positive reviews | 61.2% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Monetization | Paid | **Freemium** |
| Best chart rank | **#90** | — |
| Size | 35 MB | 151 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [A.S.M.A. B.V.](https://appshunter.io/developer/1066843463) | [Collin Chartier](https://appshunter.io/developer/1884055652) |

## What reviewers say

### HRV4Training

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

**Currently charting:** #90 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


### GroundApp

[App page](https://appshunter.io/ios/app/groundapp-breathwork/id6760352779)

This app uses AI to guide you through scientifically-backed breathwork techniques to help you feel calm, focused, and present. It offers personalized sessions based on your current state and goals, with wearable integration for biometric insights.

**Highlights:** AI-guided personalized breathwork sessions, 33 scientifically-backed breathing techniques, Wearable integration (Apple Health, Oura, Whoop, Garmin), Biometric insights (HRV, heart rate, sleep), Ambient soundscapes and binaural beats, Progress tracking and session history, Apple Watch companion app

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ground Premium | $29.99 | per year |


## Frequently asked questions

### Is HRV4Training free?

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

### Is GroundApp free?

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

### Which has better reviews, HRV4Training or GroundApp?

GroundApp is rated higher. HRV4Training averages 3.6 out of 5 from 288 ratings, while GroundApp averages 5.0 from 11 ratings.

### Do HRV4Training or GroundApp have ads?

Neither HRV4Training nor GroundApp shows ads.

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

HRV4Training ships an update every 6 weeks, and GroundApp every 2 days. Most recently, HRV4Training was updated on October 15, 2026 and GroundApp on October 8, 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.*