# HRV4Training vs Airofit Legacy

The clearest difference is price: Airofit Legacy at Free against HRV4Training's $9.99. Airofit Legacy also leads on rating (4.5 vs 3.6) and review sentiment (76% vs 61%). HRV4Training's advantage is in-app purchases (none vs 4) and chart position (#29 vs unranked). On update cadence, ads, device support and iOS requirement there is nothing between them.

Airofit Legacy is free to download; HRV4Training costs $9.99 up front. Airofit Legacy sells 4 in-app purchases, starting at $6.99 per month. HRV4Training asks for nothing beyond the download.

Airofit Legacy holds the better App Store score, 4.5 against 3.6. Both are backed by a comparable volume of ratings — 290 and 1.3K respectively. Written reviews point the same way: 61% of HRV4Training's written reviews are positive against 76% of Airofit Legacy's.

HRV4Training ships an update every 6 weeks, Airofit Legacy every 5 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HRV4Training | Airofit Legacy |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [3.6 (290 ratings)](https://appshunter.io/ios/app/hrv4training/id686923970/reviews) | **[4.5 (1.3K ratings)](https://appshunter.io/ios/app/airofit-legacy/id1469023267/reviews)** |
| Number of ratings | 290 | **1.3K** |
| Positive reviews | 60.9% of reviews | **75.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#29** | — |
| Size | 35 MB | 182 MB |
| Requires iOS | **15.6** | 16 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [A.S.M.A. B.V.](https://appshunter.io/developer/1066843463) | [Airofit A/S](https://appshunter.io/developer/1269490789) |

## What reviewers say

### HRV4Training

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

**Currently charting:** #29 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


### Airofit Legacy

[App page](https://appshunter.io/ios/app/airofit-legacy/id1469023267)

This app pairs with a breathing trainer device to help you measure and improve your respiratory strength and lung capacity. It offers customized training programs for various goals like athletic performance, relaxation, and stress reduction, with progress tracking.

**Highlights:** Informative lung tests, Targeted training programs, Challenging exercises with visual/audio guidance, Engaging activity tracking, Personalized profile and reminders, Breathing exercises for strength, tolerance, capacity, performance, and relaxation

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Airofit PRO (monthly) | $6.99 | per month |
| Airofit (Monthly) | $9.99 | per month |
| Airofit PRO (yearly) | $59.00 | per year |
| Airofit (Yearly) | $84.00 | per year |

**What reviewers like**

- 👍 Effective for improving breathing and lung capacity
- 🚀 Noticeable improvements in a short time
- 💪 Helpful for athletes and those with respiratory issues
- 📊 Provides useful metrics and progress tracking
- 🧘‍♀️ Aids in relaxation and stress reduction

**What reviewers complain about**

- 🐛 App crashes, freezes, or has connectivity issues
- 🔍 Lack of clear instructions or guidance on using the device
- 💰 Expensive device and subscription model
- 🔋 Battery life and charging issues
- 📱 App UI/UX could be improved

**Reported bugs**

- App not recognizing device or subscription
- Inaccurate lung capacity measurements
- Exercises not working as intended
- Progress data being lost after app updates

**Requested features**

- Offline mode for training sessions
- More customization options for training programs
- Integration with Apple Health or other fitness apps
- Better data export and analysis tools
- Improved customer support and responsiveness


## Frequently asked questions

### Is HRV4Training free?

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

### Is Airofit Legacy free?

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

### Which has better reviews, HRV4Training or Airofit Legacy?

Airofit Legacy is rated higher. HRV4Training averages 3.6 out of 5 from 290 ratings, while Airofit Legacy averages 4.5 from 1.3K ratings.

### Do HRV4Training or Airofit Legacy have ads?

Neither HRV4Training nor Airofit Legacy shows ads.

### Which is updated more often, HRV4Training or Airofit Legacy?

HRV4Training ships an update every 6 weeks, and Airofit Legacy every 5 weeks. Most recently, HRV4Training was updated on November 6, 2026 and Airofit Legacy on November 3, 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.*