Before you begin
RHz is an Android app for resonance breathing with live HRV biofeedback. A compatible external Bluetooth heart-rate monitor is required for real sessions. Polar H10 is recommended because chest-strap ECG provides dependable beat-to-beat timing.
- Charge and wear your monitor according to its manufacturer's instructions.
- Enable Bluetooth on your Android device.
- Use RHz while seated, standing, or lying safely and without multitasking.
1. Pair your monitor
Open RHz, choose Connect, and allow the Bluetooth permissions Android requests. Select your monitor from the scan list, then link it inside RHz. Pairing through the phone's general Bluetooth settings is usually unnecessary.
WHOOP 5.0 has also been tested. For measured HRV feedback, choose a monitor that sends actual beat-to-beat RR intervals through the standard Bluetooth Heart Rate service. Some heart-rate-only devices can connect, but RHz estimates their intervals; that is not equivalent to measured beat-to-beat data. Compatibility and signal quality vary by model.
2. Choose a session
Find My Frequency — Full Sweep
The full session begins with a natural-breathing baseline, explores several broader breathing rates, and then checks a finer range around the strongest measured response. Allow roughly 22 minutes.
Quick Tune — Fine Sweep
A shorter fixed-range sweep for a focused check. It includes a baseline plus several closely spaced breathing rates and takes roughly 12 minutes.
Smart Start — Adaptive
Adaptive sessions adjust during practice and can use your past sessions as a starting point. New users begin with a brief discovery sequence. Choose a duration from 5 to 60 minutes, or use indefinite mode where available.
3. Set your session preferences
Select a safe posture, choose the session intention that fits the moment, and set your preferred feedback. RHz can provide a visual pacer, haptics, and optional binaural audio cues. These settings change the guidance experience, not the underlying hardware requirement.
4. Follow the pacer
After the short get-ready countdown, follow the inhale and exhale guidance without forcing the breath. RHz displays the current breathing pace and live feedback while it compares your beat-to-beat response across the session.
Personal resonance is not a permanent medical measurement. Treat the identified pace as a practical training reference that you can revisit over time.
5. Review and export
Completed sessions are saved on your device. History shows session summaries and a resonance landscape; Trends shows how your recorded frequency patterns change across sessions. You can export CSV or JSON when you choose.
Once an exported file leaves RHz through your device's sharing tools, it may be handled by other apps or services under their own privacy practices.
Safety and scope
Use RHz only in a safe, stationary environment. Do not use breathing exercises while driving, cycling, operating machinery, or performing any task that needs your full attention. Stop if you feel unwell.
RHz is a general wellness and educational tool. It is not intended to diagnose, monitor, treat, cure, or prevent a disease or medical condition.