MitoSyne Coherence HRV Breathing Trainer

A visual and haptic breathing pacer for slow, comfortable practice, with optional non-diagnostic pulse-interval feedback.

Coherence guides adjustable sessions from 4.5 to 7 breaths per minute without requiring a phone in view.

A closer look

Coherence makes slow breathing easier to practice consistently. A soft light ring and optional haptic cue expand and contract at the selected pace, so the session can continue without watching a phone. A broad pace range and sessions from three to twenty minutes leave room for individual comfort rather than forcing one pattern on every user. The sensor model adds pulse-interval trends as reflective feedback, not as a clinical HRV assessment. Slow breathing around an individual's comfortable resonant range can increase short-term heart-rate variability and reduce some stress measures, while breathing too deeply or too quickly can cause dizziness or tingling. Coherence therefore favors quiet, low-volume breathing and an unforced rhythm over chasing a target score.

The details that matter

• Adjustable 4.5-7 breaths per minute with equal or extended-exhale modes
• Visual and haptic guidance that works without a phone
• 3/5/10/15/20-minute sessions and quiet night mode
• Optional PPG sensor for non-diagnostic pulse-interval trends
• No subscription required; session history stored locally

Why it belongs

Coherence supports a repeatable skill with restrained feedback, keeping attention on the quality of the practice rather than a grand physiological promise.

What the evidence supports

Slow paced breathing and HRV biofeedback show modest benefits for autonomic measures and stress-related outcomes across heterogeneous studies. The optimal pace varies.

What it is designed to do

Guides slow paced-breathing sessions and, in the sensor model, displays non-diagnostic pulse-interval trends for personal review.

Use and care

Stop if lightheaded, numb, short of breath or uncomfortable. People with significant respiratory or cardiovascular conditions should discuss paced-breathing practice with a clinician.