HRV4Training vs SORCE App
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
SORCE App
This app uses your physical and behavioral data to provide personalized health and performance coaching. It offers energetic and emotionally perceptive communication, diverse content, and access to expert coaches for individuals, teams, and organizations.
- Personalized health and performance coaching
- Physical and behavioral data capture
- Energetically and emotionally perceptive communication
- Access to world-class coaches
- Content variety
- Team and organizational coaching
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SORCE captures a user’s physical and behavioral data to drive health + performance coaching for individuals, teams, and organizations. SORCE communicates to the user in a way that is energetically and emotionally perceptive while delivering content variety and access to world class coaches. SORCE serves the employer and employee with equal impact in different ways.
Screenshots
Verdict
The clearest difference is price: SORCE App at Free against HRV4Training's $9.99. SORCE App also leads on rating (5.0 vs 3.6) and update cadence (every 10 days vs every 6 weeks). HRV4Training's advantage is ratings volume (290 vs 13) and chart position (#30 vs unranked). On ads, in-app purchases and device support 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
SORCE App is free to download; HRV4Training costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SORCE App holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: HRV4Training has 290 ratings behind it against 13, so its average is the more settled of the two.
HRV4Training ships an update every 6 weeks, SORCE App every 10 days. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.
| Parameter | HRV4Training | SORCE App |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 3.6 (290 ratings) | 5.0 (13 ratings) — better |
| Positive reviews | 60.9% of reviews | — |
| Number of ratings | 290 — better | 13 |
| Update frequency | Every 6 weeks | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #30 — better | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.6 |
| Further details — not scored | ||
| Size | 35 MB | 82 MB |
| Age rating | 4+ | 12+ |
| Developer | A.S.M.A. B.V. | sorce.io |
Customer experience
HRV4Training
SORCE App
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
SORCE App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
HRV4Training
No in-app purchases
SORCE App
No in-app purchases









