Best HRV Apps in 2026: Watch, Camera or Chest Strap
The best HRV app depends on how you want to measure. If you wear an Apple Watch, pick an app that reads its overnight HRV and compares it with your baseline (Athlytic $29.99 a year, Bevel or Bodly free to start). With no wearable, HRV4Training ($9.99 once) measures through your phone's camera. For the most accurate morning reading, use a Bluetooth chest strap with Elite HRV or Kubios HRV, both free.
HRV (heart rate variability) is the variation in time between heartbeats. Higher than your own normal usually means you are recovered; lower usually means stress, illness, poor sleep or hard training. The method matters more than the app, so this guide starts there.
Three ways to measure HRV
| Method | How it works | Accuracy | Effort | Apps |
|---|---|---|---|---|
| Smartwatch, ring or band | Measures automatically during sleep | Good to excellent, varies by device | None | Athlytic, Bevel, Bodly (Apple Watch); Oura, WHOOP (own apps) |
| Phone camera | Fingertip over the camera for 1 to 5 minutes | Good at rest | Daily morning reading | HRV4Training, Welltory |
| Chest strap or finger sensor | Bluetooth sensor records each beat | Best outside a lab | Daily reading plus a sensor | Elite HRV, Kubios HRV |
Overnight measurement is the most practical. It needs no routine, and sleep is when your body is most comparable from one day to the next. A morning reading with a strap or camera is more controlled, but only works if you do it the same way every day.
How accurate is each method?
Validation studies have tested all three against an ECG, the clinical reference.
| Device or method | Study | Agreement with ECG |
|---|---|---|
| Phone camera (HRV4Training) | 2017, 29 people at rest | Trivial differences, correlation 1.00 |
| Oura Ring Gen 4 | 2025, 536 nights | Concordance 0.99, average error 6.0% |
| WHOOP 4.0 | 2025, 536 nights | Concordance 0.94, average error 8.2% |
| Garmin Fenix 6 | 2025, 536 nights | Concordance 0.87, average error 10.5% |
| Apple Watch Series 6 | 2022 sleep lab | Intraclass correlation 0.67 (good) |
Three things to keep in mind. The camera study measured people sitting still for five minutes, and one author founded HRV4Training, the app tested. The Apple Watch result is for an older Series 6, compared across the whole night with the ECG; newer watches sample HRV far more often. And for recovery, what matters is that one device is consistent with itself, because you compare today with your own baseline, not with anyone else.
The best HRV apps
| App | Measures with | US price (App Store, October 2026) | Best for |
|---|---|---|---|
| Athlytic | Apple Watch | Free download; Pro $29.99 a year or $4.99 a month | WHOOP-style recovery from Apple Watch |
| Bevel | Apple Watch and other wearables | Free scores; Pro $99.99 a year | A polished all-in-one Apple Watch app |
| Bodly | Apple Watch | Free to download | HRV with sleep, strain, food and body tracking |
| HRV4Training | Phone camera or chest strap | $9.99 once | Athletes who want a morning reading without a wearable |
| Elite HRV | Chest strap or finger sensor | Free; extras from $0.99 | A free, structured morning routine |
| Kubios HRV | Chest strap (accelerometer mode in beta) | Free | The most detailed HRV analysis |
| Welltory | Phone camera or wearables | Free download; Premium $99.99 to $119.99 a year | Stress and energy insights |
Athlytic: recovery from your Apple Watch
Athlytic reads HRV and resting heart rate from Apple Health and turns them into a recovery score with strain and sleep alongside. It needs an Apple Watch (or a wearable that writes HRV to Apple Health) for most features. Pro is $29.99 a year.
Bevel: the polished all-rounder
Bevel builds recovery, strain, sleep and an energy score from your Apple Watch, with food and strength training in the same app. The core scores are free; Pro costs $99.99 a year. Our Bevel review covers what is free and what we noticed using it daily.
Bodly: HRV in context
Bodly reads your Apple Watch's overnight HRV and resting heart rate and scores recovery against your own baseline, next to sleep, strain, stress and energy. It also tracks food, weight, measurements and progress photos, which helps when you want to see whether a low-HRV week lines up with poor sleep, a hard training block or a calorie deficit.
HRV4Training: no wearable needed
HRV4Training measures HRV with your phone's camera (fingertip over the lens) or a Bluetooth chest strap, in a morning reading of one to five minutes. It costs $9.99 once and is popular with endurance athletes. Note that its developer says the Apple Watch cannot be used for its own HRV analysis, because the watch does not share beat-to-beat data.
Elite HRV: free morning readings with a sensor
Elite HRV guides a short morning reading with a chest strap or finger sensor and tracks your readiness over time. It is free; the in-app purchases are small extras. You will need a compatible sensor; it does not use the Apple Watch.
Kubios HRV: the most detailed analysis
Kubios comes from the makers of the HRV analysis software used in research. The free app pairs with a Bluetooth heart rate sensor such as the Polar H10 for a morning readiness reading, and recently added an accelerometer-based mode in beta.
Welltory: stress and energy
Welltory measures HRV through the camera or a wearable and frames it as stress and energy. The free version is limited; Premium costs $99.99 to $119.99 a year, with a lifetime option.
How to get a useful HRV number
- Measure the same way every time. Overnight from a watch, or every morning in the same position, before coffee.
- Compare with yourself. A 7-day average against your 30 to 60-day baseline means more than any single reading.
- Do not mix formulas. SDNN (most Apple Watches) and RMSSD (most apps and wearables) differ; Apple Watch HRV explains why.
- Read it alongside sleep and training. One low day is noise; three low days with poor sleep is a signal.
Want to know where your number sits? Good HRV by age has percentile tables, what is HRV explains the basics, and how to increase HRV covers what actually moves it. You can also take a quick reading with your camera in our free online heart rate monitor.
A note on health
HRV is a training and recovery signal, not a diagnosis. A sudden, lasting drop together with symptoms such as chest pain, palpitations, breathlessness or dizziness is a reason to see a doctor, not to adjust your training.
How we picked these apps
We included the HRV apps people search for most, across the three measurement methods, and checked each one's US App Store listing for price and how it measures HRV on October 27, 2026. Accuracy figures come from independent validation studies, listed below. Bodly is our own app.
Sources
- Plews DJ, et al. Comparison of heart-rate-variability recording with smartphone photoplethysmography, Polar H7 chest strap, and electrocardiography. International Journal of Sports Physiology and Performance (2017).
- Dial MB, et al. Validation of nocturnal resting heart rate and heart rate variability in consumer wearables. Physiological Reports (2025).
- Miller DJ, Sargent C, Roach GD. A validation of six wearable devices for estimating sleep, heart rate and heart rate variability in healthy adults. Sensors (2022).
Frequently asked questions
Apps that read the HRV your Apple Watch records overnight and compare it with your own baseline: Athlytic, Bevel and Bodly are the main ones. Remember that most Apple Watches store HRV as SDNN, while chest-strap and camera apps report RMSSD, so their numbers are not interchangeable.
Yes. Elite HRV and Kubios HRV are free to download and use with a Bluetooth chest strap or finger sensor, and apps that read Apple Watch data, such as Bevel and Bodly, show HRV-based recovery for free. HRV4Training is a one-time $9.99 purchase on the US App Store and needs only the phone's camera.
At rest, yes. In a 2017 study of 29 people, RMSSD from a smartphone camera matched an ECG with only trivial differences during 5 minutes of rest. One of the authors founded HRV4Training, the app tested. Camera readings fall apart if you move, talk or press too hard.
A chest strap such as the Polar H10 with an app like Kubios HRV or Elite HRV, measured lying down for a few minutes every morning. For overnight HRV without a strap, the Oura Ring had the highest agreement with ECG (0.99) in a 2025 study over 536 nights.
Two reasons. Apple reports HRV as SDNN on most watches, while most apps and wearables report RMSSD, a different formula. And they measure at different times: an overnight average, a single morning reading and spot checks during the day will all differ. Compare each source only with itself.
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