An honest side-by-side of the apps most people consider when they're looking for HRV-based breathing training. We are obviously biased — but we've tried to be specific and fair about what each tool does and doesn't do.
| Heart Resonance | HeartMath Inner Balance |
Elite HRV | Welltory | Breathwrk | |
|---|---|---|---|---|---|
| Pricing model | $9.99 one-time | ~$5 – 10/mo subscription, plus $129 sensor | Free tier + ~$10/mo Pro | Free tier + ~$10/mo Pro | ~$15/mo subscription |
| Measures your resonance frequency | Yes — adaptive ASSESS / REFINE / HOLD | No — fixed 6 BPM default with manual override | Partial — manual session at set rates | No | No — generic pacing patterns only |
| Shaffer six-criteria coherence | All six, exposed per session | Proprietary single "coherence" score | LF peak + time-domain, no single coherence score | No | No |
| Works with standard Bluetooth HR sensors | Any BLE HRS-compliant sensor | Proprietary sensor required | Yes | Wrist PPG only (wearable-dependent) | No sensor used |
| CSV export of raw data | Yes — R-R, cues, spectrum | Limited summary export | Yes | No | No |
| Offline / no-cloud | All data on device | Cloud sync | Cloud sync with account | Cloud-only | Account-bound |
| Audio + haptic breath cues | 10 sound packs + haptic | Audio tones | Limited | No | Extensive audio |
| Real-time HRV chart during session | Full BPM trace, live | Summary bar only | Yes | Post-session only | No |
| Clinician-friendly methodology | Published six-criteria, transparent | Proprietary, widely used clinically | Research-oriented | Consumer / lifestyle | Consumer / lifestyle |
Who each app is actually for
HeartMath Inner Balance
The category leader by a long way. HeartMath has been doing coherence training since the 1990s and the research base behind their methodology is extensive and respected. The Inner Balance sensor and app are used in clinical settings worldwide. The downsides are the proprietary sensor, the subscription model, and a single coherence metric that obscures what's going on underneath. If you want a turnkey clinical-grade experience and don't mind the cost, this is the default choice.
Elite HRV (now HRV4Training Pro)
Built for athletes tracking daily readiness via morning HRV measurements, with a secondary breathing-training feature. If your primary use case is monitoring overtraining and recovery, Elite HRV is the better tool. For coherence training specifically, the breathing module is functional but not the main thing they invest in.
Welltory
Consumer-friendly app built on wrist-PPG HRV from Apple Watch, Garmin, or Fitbit. Pretty charts, lifestyle framing, daily "stress" score. Useful as a trend tracker if you're already wearing a watch. Not accurate enough at the beat level to be the core tool for resonance training. Treat it as a companion, not a substitute.
Breathwrk
An excellent guided breathing app — box breathing, 4-7-8, wim hof, various specific protocols. Not an HRV tool at all. If you want coached breathwork across a range of styles and the science of measurement isn't your priority, Breathwrk is good. But it can't tell you whether the breathing is actually doing what the literature says it does — for that you need the heart-rate feedback.
Heart Resonance
Built specifically around Vaschillo / Lehrer-style resonance frequency training, measured directly from your HRV, with the Shaffer six-criteria methodology fully exposed. No cloud, no subscription, standard Bluetooth sensors. The sweet spot is anyone who wants the measurement-first experience of Elite HRV with the dedicated resonance-frequency focus of HeartMath, without being locked into a proprietary sensor or a recurring bill.
Fair criticisms of Heart Resonance
To return the fairness: a few honest weaknesses vs. the competition.
- Less polished UX in places. HeartMath has been iterating on this for 20+ years. We've been iterating for months.
- No cloud sync. By design, but if you change phones you'll need to re-export sessions. Cloud sync is on the roadmap if user demand supports it without compromising the privacy stance.
- Android-only at launch. iOS is coming but not yet. If you're on iPhone, HeartMath or Elite HRV are your current options.
- No meditation content, guided exercises, or mindfulness programming. This is a measurement tool, not a wellness app. If you want coached breathing sessions, Breathwrk is better at that specific thing.
- No built-in community or gamification. Just sessions, scores, and data. Some people want streaks and badges; we've kept it minimal.
There is not a single "best" app in this space — they aim at different jobs. If you want the most rigorous measurement-based coherence training at a one-time price, Heart Resonance is the one we built. If you want a clinically-established brand and don't mind the lock-in, HeartMath is great. If you want daily readiness tracking, Elite HRV. If you want coached breathwork without the science, Breathwrk. Pick the job, then pick the tool.