Comparison

HRV4Training vs SweetBeat HRV

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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

About

SweetBeat HRV

This app analyzes heart rate variability (HRV) and stress levels to provide insights into your health and how your activities impact it. It requires external hardware for accurate HRV measurement and offers features for stress monitoring, training recommendations, and data export.

Highlights
  • HRV and stress analysis
  • Real-time stress monitoring
  • HRV for training recommendations
  • KardiaMobile 6L integration
  • RR interval data export
  • Apple Health data import
  • Customizable relax screen
Features
Read full description

By analyzing HRV and Stress along with additional data, SweetBeat HRV provides a deeper dive into health and provides insight into what activities you engage in that effect the health metrics you care about. IMPORTANT: SweetBeat requires external hardware: A tested Bluetooth Low Energy Heart Rate Monitor or KardiaMobile 6L hand held heart rate monitor. While other manufacturers wrist worn devices work well for heart rate, their wrist worn heart rate monitors are not accurate enough for HRV and so are not supported. The iWatch is not supported. •Please visit https://www.sweetwaterhrv.com/healthsensors.shtml for a list of compatible Heart Rate Monitors devices. SweetBeat HRV will also import your Apple Health app data (SDNN, Resting Heart Rate, Average Heart Rate) that is collected by the iWatch or other devices authorized to store metric in the Health app. This data is for viewing purposes only and is not used in any HRV calculation. SweetBeat has two main components: •Monitor Stress •HRV for Training/Recovery •KardiaMobile 6L 3 Minute CheckUp Monitor Stress: With SweetBeatHRV, you can see your stress levels in real time, giving you the ability to take action to reduce stress. If your chosen stress threshold is reached, SweetBeat’s Relax screen prompts you with a deep breathing screen that includes calming images. •Stats: The stats screen more widely referred to as the “geek” screen, shows all the metrics being measured. If using the HealthPatch, the user can view the additional provided metrics. •Graph: The graph screen shows a real-time building graph of your heart rate from RR Intervals. Turning the phone 90 degrees counter-clockwise will bring up the graph in landscape. •Export RR Intervals: SweetBeat provides RR interval export capability along with other raw data files in .csv format. HRV For Training: In competitive sports, improved performance is often affected by alternating periods of intensive training with periods of relative rest. SweetBeatHRV measures HRV, an objective measure of your body’s response to each workout and provides training recommendations based on the morning reading. KardiaMobile 6L 3 Minute CheckUp: With SweetBeatHRV and the KardiaMobile 6L hand held device, you can measure your HRV with a 3 minute countdown timer. This type of session can be used conveniently any time of the day when you want to check your HRV and stress levels. The KardiaMobile 6L hand held device is convenient and eliminates the need of a heart rate monitor chest strap. Please note that the KardiaMobile 6L device is the only KardiaMobile device that is presently supported by SweetBeat HRV. SweetBeat Features: •Customize your Relax screen images with your favorite pictures. •Track your heart rate recovery after exercising. •Save and upload sessions to your secure SweetWater Health account at www.BeatHealthy.com. •Email your RRs and session data for personal analysis off-line •View your Apple Health data with trend lines

Screenshots

HRV4Training4 screens
SweetBeat HRV4 screens

Verdict

The call

The clearest difference is monetization model: SweetBeat HRV at free against HRV4Training's paid. HRV4Training's advantage is ratings volume (290 vs 24) and chart position (#22 vs unranked). On price, rating, review sentiment and ads 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

CostPrice · In-app purchases · Ads · Monetization

HRV4Training costs $9.99 and SweetBeat HRV $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SweetBeat HRV holds the better App Store score, 3.8 against 3.6. That said, the two scores are not equally well evidenced: HRV4Training has 290 ratings behind it against 24, 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 65% of SweetBeat HRV's.

UpkeepUpdate frequency

HRV4Training ships an update every 6 weeks, SweetBeat HRV every 3 months. Both last shipped on November 1, 2026.

Scorecard4 real differences · 7 level
HRV4Training versus SweetBeat HRV: the parameters behind the verdict, then further details
ParameterHRV4TrainingSweetBeat HRV
Price$9.99$9.99
Rating3.6 (290 ratings)3.8 (24 ratings) — better
Positive reviews60.9% of reviews64.9% of reviews — better
Number of ratings290 — better24
Update frequencyEvery 6 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#22 — better—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.6 — better16.6
Further details — not scored
Size35 MB240 MB
Age rating4+12+
DeveloperA.S.M.A. B.V.SweetWater Health

Customer experience

HRV4Training

All ratings288 ratings
Positive62.2%
Neutral5.6%
Negative32.3%
Written reviews453 reviews
Positive60.9%
Neutral7.3%
Negative31.8%

SweetBeat HRV

All ratings24 ratings
Positive75.0%
Neutral4.2%
Negative20.8%
Written reviews57 reviews
Positive64.9%
Neutral5.3%
Negative29.8%

User reviews

HRV4Training

From 290 App Store ratings

What 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

SweetBeat HRV

From 24 App Store ratings

What we love

  • 📊 Extensive and accurate data
  • 📈 Detailed HRV metrics (HF, LF, VLF)
  • 💨 Respiration rate & heart capacity
  • ✨ Beautiful graphics
  • 🤝 Fantastic support

Room to improve

  • 🐛 App is buggy
  • 📱 UI issues on specific devices (iPhone SE, iPad)
  • 🔄 Upgrade issues
  • ❌ Won't pair with devices
  • 💸 Redundant hardware required

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

SweetBeat HRV

Reported bugs

75 issues
  • App no longer usable on iPhone SE
  • App useless on mini iPad
  • App no longer functions after upgrade
  • Cannot see HRV after upgrade
  • New reading shows everything but HRV
Show 70 more
  • Won't pair with Withings HR
  • No response from company
  • Almost nothing worked
  • App insisted on buying redundant hardware
  • Charts unreadable and a joke
  • Desktop view of progress doesn't work
  • App often closes after a few hours
  • App crashes frequently
  • False HRV readings and advice
  • Summary screen HRV higher than detailed screens
  • App unstable with latest OS updates
  • Cannot save sessions or call up older sessions without crashing
  • Cannot sign up, password not accepted
  • Cannot click "agree to terms and conditions"
  • Cannot find Garmin HRM
  • App crashes at the end of HRV training
  • Other readings don't work well
  • Charts are difficult to maneuver
  • Polar H7 sync issues with iOS 9
  • Customer support nonresponsive
  • Polar HR strap stopped working
  • iPhone 6S no longer connects to Polar H7
  • New graphs caused stress level to rise
  • Cannot select between HRV, HR, or stress level
  • Newest version still very buggy
  • Food sensitivity testing button not showing
  • Version 1.3.0 issues
  • App doesn't see HR monitor
  • App crashes a lot
  • Sync issues with Polar H7
  • App no longer connects to Polar H7
  • App crashes at the end of HRV training
  • Other readings still don't work well
  • Charts are difficult to maneuver
  • App unstable with latest OS updates
  • Cannot save sessions or call up older sessions without crashing
  • App no longer usable on iPhone SE
  • App useless on mini iPad
  • App no longer functions after upgrade
  • Cannot see HRV after upgrade
  • New reading shows everything but HRV
  • Won't pair with Withings HR
  • No response from company
  • Almost nothing worked
  • App insisted on buying redundant hardware
  • Charts unreadable and a joke
  • Desktop view of progress doesn't work
  • App often closes after a few hours
  • App crashes frequently
  • False HRV readings and advice
  • Summary screen HRV higher than detailed screens
  • App unstable with latest OS updates
  • Cannot save sessions or call up older sessions without crashing
  • Cannot sign up, password not accepted
  • Cannot click "agree to terms and conditions"
  • Cannot find Garmin HRM
  • App crashes at the end of HRV training
  • Other readings don't work well
  • Charts are difficult to maneuver
  • Polar H7 sync issues with iOS 9
  • Customer support nonresponsive
  • Polar HR strap stopped working
  • iPhone 6S no longer connects to Polar H7
  • New graphs caused stress level to rise
  • Cannot select between HRV, HR, or stress level
  • Newest version still very buggy
  • Food sensitivity testing button not showing
  • Version 1.3.0 issues
  • App doesn't see HR monitor
  • App crashes a lot

Requested features

21 requests
  • Improve UI for iPad
  • Add swipe functionality for charts
  • Customizable HR zones and alarms
  • Integrate with workout monitoring apps
  • Update app for stability
Show 16 more
  • Improve audio for breathing guide
  • Add monitoring feature
  • Refine graphical interface for iPad
  • Update app to look modern
  • Make app screen size for iPad
  • Add workout tracing integration
  • Improve audio design for breathing guide
  • Add option to turn off recommendations
  • Improve user experience with chart navigation
  • Add instant RR heart rate graph
  • Add options to change resonance pace
  • Fix bugs and improve stability
  • Improve HR alarm functionality
  • Add custom HR color zones
  • Improve food sensitivity testing button visibility
  • Add more intuitive help resources

In-app purchases

None

HRV4Training

No in-app purchases

None

SweetBeat HRV

No in-app purchases

Questions

Is HRV4Training free?
HRV4Training costs $9.99, with no in-app purchases.
Is SweetBeat HRV free?
SweetBeat HRV costs $9.99, with no in-app purchases.
Which has better reviews, HRV4Training or SweetBeat HRV?
SweetBeat HRV is rated higher. HRV4Training averages 3.6 out of 5 from 290 ratings, while SweetBeat HRV averages 3.8 from 24 ratings.
Do HRV4Training or SweetBeat HRV have ads?
Neither HRV4Training nor SweetBeat HRV shows ads.
Which is updated more often, HRV4Training or SweetBeat HRV?
HRV4Training ships an update every 6 weeks, and SweetBeat HRV every 3 months. Most recently, HRV4Training was updated on November 1, 2026 and SweetBeat HRV on November 1, 2026.

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