HRV4Training is an iPhone and Android app from Marco Altini that asks you to take a short morning HRV reading, then compares that rMSSD number with your own normal range. It is not an overnight Watch dashboard, a Whoop clone, or a rewards app. You sit still, measure, tag things like alcohol or illness, and train from the trend. That is why athletes still pay for it, and why people who wanted a Watch complication often uninstall it within a week.
Search interest in the brand is still in the thousands a month in the UK, even after a noisy three-month dip. If you want a side-by-side of several HRV apps, see best HRV apps. This page is the dedicated review.
Short verdict: HRV4Training is a strong fit if you will measure at the same time, in the same posture, most mornings. An overnight Recovery app is the easier choice if you will not. Running both for curiosity is fine. Training off both numbers at once is how breakfast gets loud.
Disclosure: Fitcoin is our product. We are not affiliated with Apple, Garmin, Whoop, Bevel, Athlytic, HRV4Training or the other apps named here. Where Fitcoin appears, it is as a Sleep, Recovery and Energy companion that also scores workouts for partner rewards, not a PayPal cash-out app. Scores described below are wellness estimates for general fitness. They are not medical devices and they do not diagnose illness.
What you actually do each morning
- Pick one sensor and keep it: the camera with a finger on the iPhone lens, a Polar-style Bluetooth strap, or Apple Watch Breathe.
- Measure after the loo, before coffee and training.
- Let the app clean RR intervals, compute rMSSD, and place you in your historical range.
- Tag context such as alcohol, travel, sickness or a hard session so the trend has a story.
If you skip the tags, every low reading starts to look like overtraining. Sometimes it was two beers.
The Apple Watch path, honestly
Apple Watch is not paired the way a Polar H10 is. You sit still for a Breathe or Mindfulness session so RR intervals land in Apple Health, then you open HRV4Training and read them. Altini’s own writing says the Watch is accurate for that spot check, but he does not recommend using Apple’s sporadic night samples as the daily decision. If that workflow sounds like faff, an overnight Recovery app such as Athlytic or Bevel is closer to what you wanted.
You typically need to pull the Health data soon after the Breathe session. His docs have long said a few hours, not tomorrow afternoon.
Versus overnight Recovery apps
| HRV4Training | Athlytic / Bevel / Fitcoin Recovery | |
|---|---|---|
| When the number appears | In the morning, taken on purpose | While you sleep, or at wake from sleep HRV |
| Metric | rMSSD, plus derived recovery points | App-specific Recovery %; the HRV method varies |
| You must… | Sit still and take the reading | Wear the Watch all night |
| Fails when… | You skip the morning ritual | The Watch charged on the nightstand |
| Also scores gym / rewards | No | Fitcoin does; Bevel and Athlytic are training dashboards |
Who it is for
HRV4Training suits endurance athletes, coaches, and anyone who already liked morning HRV on a chest strap and wants the camera as a backup.
It is a weaker fit if you wanted a Whoop colour on the Watch face, you will not sit still, or you came for sleep stages. If sleep is the job, see sleep apps rather than HRV4Training.
Where Fitcoin sits instead
Fitcoin Recovery uses overnight HRV versus your baseline as the largest pillar when the data exists, then sleep and load. It does not replace a 60-second morning rMSSD ritual, and it does not try to. If you love HRV4Training, keep it. If you wanted HRV without the homework, overnight Recovery on the Watch you already wear is the easier loop.
What the app actually shows besides a millisecond
You get a normal range built from your history, not a universal athlete table, plus recovery points as a friendlier transform of rMSSD. Advice stays conservative when you sit below your range. Tags help you see that travel and alcohol explain more mystery drops than your Tuesday tempo. Integrations exist to bring in other night HRV sources as context, but they do not turn HRV4Training into an overnight Watch dashboard.
The interface is utilitarian, and that is not an insult. People who wanted glossy rings tend to look at overnight Watch apps instead.
Price and the habit problem
HRV4Training has long been cheap relative to Whoop. Confirm the live App Store price; we are not printing a number that will rot. The real cost is the minute every morning. Miss twelve mornings in a month and the trend is too thin to trust, which is frustrating if you paid for the habit.
If morning journaling, weigh-ins and meditation already bounced off you, morning HRV may too. An overnight Recovery app is the gentler default until you know you will sit still.
When to add a Polar strap
If you already own an H10-class strap, use it. The optical camera and Watch Breathe are good enough for consistency; a strap is cleaner if you fidget. Do not buy a strap solely because a forum said camera PPG is fake. Altini treats a still camera reading and a still Watch Breathe reading as usable. Fidgeting is the enemy, not the lens.
Frequently asked questions
What is HRV4Training?
HRV4Training is an iPhone and Android HRV app from Marco Altini. You take a short morning measurement with the phone camera, a Bluetooth chest strap, or Apple Watch Breathe data written to Health. The app computes rMSSD, builds your normal range, and offers training guidance from that trend rather than from random Watch samples.
Does HRV4Training work with Apple Watch?
Yes, as a triggered measurement. Sit still, run a Breathe or Mindfulness session, then use Read from Health in HRV4Training within a few hours. It does not pull overnight Watch samples automatically the way Whoop does. Altini has argued that sporadic night Watch HRV is a poor decision tool.
Is HRV4Training better than Athlytic or Bevel?
HRV4Training is the better fit if you want a standardised morning protocol and you will actually do it. An overnight Watch app is the better fit if you wanted a face that updates while you sleep. They answer different questions. See our HRV apps guide for the split.
Is the camera accurate?
Altini has published validation work on camera PPG versus belts. The camera works when you stay still, in consistent light, every morning. It fails when you fidget, measure after coffee, or switch fingers and times. Consistency matters more than which sensor you brag about.
Does HRV4Training pay you or coach workouts?
HRV4Training is an HRV and readiness tool. It is not a rewards app and it is not a gym logger. Fitcoin is a different product: Recovery uses HRV as one pillar and still scores workouts for partner rewards.
Method and sources: Written 13 August 2026 from Apple’s Sleep Score user guide (watchOS 26 / iOS 26.2 bands), Bevel help articles on Key Terms and Common Questions, Whoop’s published Recovery explainer (green / yellow / red bands), Athlytic’s public Recovery and Exertion documentation, Marco Altini’s HRV4Training guidance on morning protocols versus overnight Watch samples, Garmin’s Body Battery description, and Fitcoin’s on-device SleepScore, Recovery, Energy and Immune Shield calculators. Third-party weights, prices and Watch compatibility change. Confirm the live app. Fitcoin inclusion is ownership-disclosed. Wellness estimates only; not medical advice.
Related reading: best HRV apps, Whoop Recovery explained, Apple Watch Body Battery.
About the author: Harris Khan is the co-founder of Fitcoin. He studied at Loughborough University and has more than 15 years of personal experience across strength training, bodybuilding, Muay Thai and general fitness.