HRV4Training vs Airofit Legacy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HRV4Training
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.
- 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
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The first scientifically validated Heart Rate Variability (HRV) app. HRV4Training provides HRV based insights to help you quantify stress, better balance training and lifestyle, and improve performance. HRV4Training does not require a heart rate monitor, since it can accurately assess your HRV using the phone's camera. HRV4Training also works with Apple Watch, the Oura ring and all compatible Bluetooth SMART sensors. HRV4Training is also the first app that goes beyond simple measurements and provides insights on: 1) acute or day to day HRV changes in response to different stressors (alcohol, travel, sick days, training, menstruation, etc.) 2) long term multi-parameter trends to look at the big picture 3) correlations between physiological measurements and annotations 4) training load analysis, fitness, fatigue, readiness to perform and injury risk 5) VO2max estimation for runners linking the app to Strava or TrainingPeaks and using a heart rate monitor during their workouts 6) Training Polarization analysis (or 80/20) 7) Lactate Threshold Estimation for runners linking the app to Strava or TrainingPeaks and using a heart rate monitor during their workouts 8) Weekly and monthly summaries to track progress. All data is processed inside the app in order to provide you with actionable interpretations that can help optimizing your training plan and performance. Supported devices for the camera measurement: iPhones 5, 5S, 6, 6S, 6+, 6S+, SE, 7, 7+, 8, 8+, X, XS, XS Max, XR, 11, 11 Pro, 11 Pro Max, 12 mini, 12, 12 Pro, 12 Pro Max, 13 mini, 13, 13 Pro, 13 Pro Max, 14, 14 Plus, 14 Max, 14 Pro, 15, 15 Max, 15 Pro, 16, 16 Max, 16 Pro Currently unsupported devices for the camera measurement: iPhones 4S, iPads and iPods - These devices require a chest strap. Other features: - HRV-based advice helps you to adapt your trainings based on objective measures of recovery - TAGS: lets you tag your sleep, mental energy, muscle fatigue, stress and all other parameters that can help you understand what is influencing your physical condition and physiological stress - Works with Bluetooth SMART heart rate monitors (a Polar H7 is recommended) or simply your phone's Camera - Integrates with the Health app (writes heart rate, and sleep, read sleep time) - Configurable test (single or orthostatic, choose test duration between 1, 3 or 5 minutes) - Extracts and stores the following features while lying down and/or standing: heart rate, mean of beat-to-beat intervals (AVNN), standard deviation of beat-to-beat intervals (SDNN), square root of the mean squared difference of successive R-Rs (rMSSD), number of pairs of successive R-Rs that differ by more than 50 ms (pNN50), low frequency power (LF, 0.04-0.15 Hz), high frequency power (HF, 0.15-0.40 Hz) - Shows the PPG signal view to ensure signal quality during the test if the camera is used instead of a bluetooth SMART sensor - HRV4T Recovery Points to provide a single, straightforward metric to analyze your physical condition - Population summaries and people like you comparisons to put your data into perspective - Analysis of compliance and consistency - Data export via email or Dropbox - Integrates with TrainingPeaks, Oura, Strava and Coros HRV4Training requires to register an account with your email address, so that your data can be backed up safely and retrieved in case anything happens (app issue, changing phone, etc.). HRV4Training does not provide medical advice. It is intended for informational purposes only. Consult a medical professional before making health or lifestyle decisions. Please find an overview of the relevant scientific literature in our guide, here: https://marcoaltini.substack.com/p/the-ultimate-guide-to-heart-rate
Airofit Legacy
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.
- 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
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Breath training has been under-prioritized in sports for too long, though scientific studies continuously prove its multiple benefits. Airofit has developed the first-ever breathing trainer that connects respiratory training with state-of-the-art app technology. Once the app is paired with the Airofit breathing trainer, you will need to take a lung test to measure your respiratory strength. After taking the lung test, you will have the option to choose one of the many programs to train your breathing. The programs will be customized according to your preference and physical condition. As a result, you can practice your breathing and keep track of your progress to see your improvements. The Airofit app is packed with loads of features, including: * INFORMATIVE LUNG TESTS: Measure your vital lung capacity and your maximal respiratory pressures. * TARGETED TRAINING PROGRAMS: Improve your physical performance by training towards specific goals. * CHALLENGING EXERCISES: Follow visual and audio instructions of how to breathe when you train. * ENGAGING ACTIVITY TRACKING: Track your progress and review your records for all the trainings and tests. * EASY PERSONAL CUSTOMIZATION: Set up reminders and personalize your profile to create the most out of your trainings. You can target you breathing training towards one of several goals, including: * RESPIRATORY STRENGTH: Enhance your respiratory power by training the strength of your lung muscles. * ANAEROBIC TOLERANCE: Increase your body's resistance towards lactate by increasing your ability to hold your breath. * VITAL LUNG CAPACITY: Increase your vital lung capacity by improving the flexibility of your lung muscles. * INSTANT PERFORMANCE: Boost your blood circulation and mental focus by breathing properly, just before important performances. * RELAXATION: Strengthen your state of mind and reduce stress levels by following meditative breathing patterns. Airofit is proven to improve your physical performance by up to 8% within just 8 weeks, training only 5-10 minutes twice a day. So, are you ready to join the top performing athletes who breathe better and strive to beat yesterday? Learn more about Airofit at Airofit.com. Terms of sale and service: https://www.airofit.com/pages/terms Jurisdiction Statement: Our app has obtained regulatory clearance for medical hardware in the European Union (EU) and complies with EU medical device regulations. However, we want to emphasize that our commitment to safety and compliance extends beyond the EU borders. Our products are designed to meet the highest international standards and are suitable for use in multiple jurisdictions. Users from all over the world can benefit from our app, knowing that it upholds the rigorous quality and safety standards required for medical hardware. Disclaimer: Airofit is not a medical app but a training app for respiratory muscles. please contact your doctor for any medical/health related issues.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | HRV4Training | Airofit Legacy |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 3.6 (290 ratings) | 4.5 (1.3K ratings) — better |
| Positive reviews | 60.9% of reviews | 75.8% of reviews — better |
| Number of ratings | 290 | 1.3K — better |
| Update frequency | Every 6 weeks | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Best chart rank | #29 — better | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.6 — better | 16 |
| Further details — not scored | ||
| Size | 35 MB | 182 MB |
| Age rating | 4+ | 12+ |
| Developer | A.S.M.A. B.V. | Airofit A/S |
Customer experience
HRV4Training
Airofit Legacy
User reviews
HRV4Training
From 290 App Store ratingsWhat we love
- 👍 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
Room to improve
- 🐛 Inconsistent readings and technical issues
- 🔒 Requires user account and data sharing
- 🔒 Concerns about data privacy
- 🔋 Drains battery when using camera for measurements
Airofit Legacy
From 1.3K App Store ratingsWhat we love
- 👍 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
Room to improve
- 🐛 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
Bugs and requests
HRV4Training
Reported bugs
3 issues- App crashes frequently, especially with iOS updates
- Syncing issues with Strava, TrainingPeaks, and Apple Health
- Camera-based measurements often unreliable or inconsistent
Requested features
4 requests- 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
Reported bugs
4 issues- App not recognizing device or subscription
- Inaccurate lung capacity measurements
- Exercises not working as intended
- Progress data being lost after app updates
Requested features
5 requests- 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
In-app purchases
HRV4Training
No in-app purchases
Airofit Legacy
- Airofit PRO (monthly)1 Month trial$6.991 Month
- Airofit (Monthly)1 Month trial$9.991 Month
- Airofit PRO (yearly)1 Month trial$59.001 Year
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- Airofit (Yearly)1 Month trial$84.001 Year
Questions
Is HRV4Training free?
Is Airofit Legacy free?
Which has better reviews, HRV4Training or Airofit Legacy?
Do HRV4Training or Airofit Legacy have ads?
Which is updated more often, HRV4Training or Airofit Legacy?
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