HRV4Training vs Hexis Live
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
Hexis Live
This app creates personalized nutrition plans for athletes based on their unique needs and daily activity. It uses intelligent algorithms to calculate energy requirements minute-by-minute, synchronizes with training data, and provides real-time insights for optimal performance and recovery.
- Carb Coding™ for individual needs
- On-demand training and wearable sync
- Intra-workout fuelling guidance
- Personalized calories and macros
- Live energy insights
- Flexible meal patterns
- Extensive meal logging database
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EVERY ATHLETE IS UNIQUE You’re unique, and so are your fuelling needs. Hexis provides an intelligent, personalised fuelling plan that adapts to each day, proven to help you perform. THE MOST ADVANCED – THE EASIEST TO USE Key Features Include: CARB CODING ™ Your fuelling needs aren’t the same as anyone else’s. Hexis’ intelligent Carb Coding™ system considers billions of variables to calculate your individual carbohydrate and energy requirements, minute by minute. With Hexis, you’ll optimise your training, maximise your recovery and drive the adaptions you need to succeed. ON-DEMAND TRAININGPEAKS & WEARABLE SYNC Sync your fuelling plan and training plan for the most powerful, accurate fuelling predictions. INTRA WORKOUT FUELLING It’s not easy to know what – and when – you should eat. But with Hexis, you don’t need to worry. There’s no guesswork, no confusion. Your personalised plan is easy to follow, with visual cues to help you get it spot on. PERSONALISED KCALS & MACROS Tailor your fuel plan to your performance and body composition goals, whether you aim to lose fat, maintain weight, or gain muscle Hexis will have you performing at your true potential. LIVE ENERGY Get minute-by-minute insights into your energy, ensuring you are on top of your fuelling and recovery needs. FLEXIBLE MEAL PATTERNS Simplify fuel planning with customisable meal patterns designed for any schedule or preference. MEAL LOGGING Log your meals effortlessly from a database of over a million foods.
Screenshots
Verdict
The clearest difference is price: Hexis Live at Free against HRV4Training's $9.99. Hexis Live also leads on update cadence (every 3 weeks vs every 6 weeks). HRV4Training's advantage is rating (3.6 vs 2.7) and review sentiment (61% vs 36%). On ads, in-app purchases, 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
Hexis Live is free to download; HRV4Training costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
HRV4Training holds the better App Store score, 3.6 against 2.7. That said, the two scores are not equally well evidenced: HRV4Training has 288 ratings behind it against 29, 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 36% of Hexis Live's.
HRV4Training ships an update every 6 weeks, Hexis Live every 3 weeks. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.
| Parameter | HRV4Training | Hexis Live |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 3.6 (288 ratings) — better | 2.7 (29 ratings) |
| Positive reviews | 61.2% of reviews — better | 36.1% of reviews |
| Number of ratings | 288 — better | 29 |
| Update frequency | Every 6 weeks | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #45 — better | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.4 |
| Further details — not scored | ||
| Size | 35 MB | 77 MB |
| Age rating | 4+ | 4+ |
| Developer | A.S.M.A. B.V. | Applied Behaviour Systems Ltd |
Customer experience
HRV4Training
Hexis Live
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
Hexis Live
Not enough reviews yet to summarise bugs or requests.
In-app purchases
HRV4Training
No in-app purchases
Hexis Live
No in-app purchases









