# Respirix: HRV Breathing Coach — HRV Biofeedback & Resonance

> HRV Biofeedback & Resonance (iPhone/iPad app by Kim Syversen.)

- Source: https://appshunter.io/ios/app/respirix-hrv-breathing-coach/id6758206591 (this page in markdown: same URL + `.md`)
- Developer: [Kim Syversen](https://appshunter.io/developer/1870072139)
- Category: Health & Fitness
- Price: $6.99
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: American English
- Released: 2026-02-07
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/respirix-hrv-breathing-coach/id6758206591/reviews.md

## What is Respirix?

Most breathing apps just play a timer. Respirix connects to your heart rate strap (optional) and shows whether your breathing is actually working in real time. Live HRV coherence feedback, a guided resonance frequency finder, and research-backed protocols. No subscription. No account. Just results. Works without a heart rate strap.

GUIDED BREATHING MADE SIMPLE
Choose from four research-backed breathing protocols or create your own custom pattern. Set your duration, hit start, and let the voice cues and visual pacer guide each breath. Put your phone down, close your eyes, and relax.

BREATHING PROTOCOLS
- Resonance (4.5s in, 5.5s out) - Maximize HRV amplitude at ~6 breaths per minute
- Extended Exhale (4s in, 6s out) -  Activate relaxation through prolonged exhalation
- Slow Diaphragmatic (4s in, 2s hold, 5s out, 2s hold) -  Stabilize your autonomic nervous system
- HRV Biofeedback (4s in, 2s hold, 6s out, 2s hold) -  Long-term autonomic retraining with live feedback
- Custom - Configure your own protocols with inhale, hold, and exhale durations

FEATURES
- Visual breathing pacer that expands and contracts with your breath
- Voice cues guide each phase. No need to watch the screen
- Haptic feedback for phase transitions (or combine both)
- Background audio keeps sessions running with screen locked
- Daily reminder at your chosen time to keep your practice consistent
- Configurable session duration (1-60 minutes)
- Save sessions to Health as Mind & Body workouts and Mindful Minutes
- Keep screen awake option

FIND YOUR RATE
Everyone has a breathing speed where their body relaxes most deeply. A guided assessment tests six different speeds, measures your heart rhythm at each one, and identifies your personal resonance frequency. Your optimal rate is then used automatically in future sessions.

OPTIONAL HEART RATE & HRV (requires Bluetooth heart rate strap)
- Live heart rate display during sessions
- Real-time HRV coherence score with visual gauge
- Adaptive breathing rate that adjusts to your coherence in real time
- RMSSD tracking (heart rate variability metric)
- Signal quality indicator
- Session summary with HR, HRV, and heart rhythm metrics

TRACK YOUR PROGRESS
- Session history grouped by day
- Trend charts for heart rhythm, heart rate, and HRV over time
- Monthly progress comparison showing how your metrics improve
- Current streak and weekly session counts

No account required. No subscriptions. No ads. Works completely offline.

Respirix is a wellness tool and does not provide medical advice, diagnosis, or treatment. Consult a healthcare professional before starting any breathing


## Version history (last 4 releases)

### 2.0.1 — 2026-03-18

- Added deeplink for in-app event

### 2.0 — 2026-03-17

- All four screens redesigned (Home, Session, History, Settings)
- Session now has Zen and Advanced display modes
- History gets an insight card and highlight cards (replacing sparkline cards with tabbed trend view)
- Streak tracking added
- Resonance assessment visuals updated to match the new session style
- Protocol builder gets a cycle ring visualization
- Device scanner gets a radar animation
- Protocol-specific phase labels and instructions
- New audio cue for hold-out phases
- Bug fixes: duration picker, technique sheet

### 1.1 — 2026-02-16

- Find Your Rate: a 10-minute assessment to discover your optimal breathing speed
- Adaptive breathing rate adjusts to your coherence in real time
- Trend charts and monthly progress tracking
- Save sessions to Health as Mind & Body workouts
- Daily practice reminders
- Create and save custom breathing protocols
- Session history now grouped by day
- Improved Bluetooth pairing reliability

### 1.0 — 2026-02-07

No release notes.

## More apps by Kim Syversen

- [Pacing Guard: Interval Timer](https://appshunter.io/ios/app/pacing-guard-interval-timer/id6757980383)
- [Promptuary: AI Prompt Manager](https://appshunter.io/ios/app/promptuary-ai-prompt-manager/id6759801317)
- [SpaceSift: Photo Cleaner](https://appshunter.io/ios/app/spacesift-photo-cleaner/id6760221975)
- [Lull: White Noise Sleep Sounds](https://appshunter.io/ios/app/lull-white-noise-sleep-sounds/id6760701742)

All apps by Kim Syversen: https://appshunter.io/developer/1870072139

## Related topics

[hrv coherence](https://appshunter.io/ios/topics/hrv-coherence) · [biofeedback breathing](https://appshunter.io/ios/topics/biofeedback-breathing)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*