Kohaer

Find calm, one breath at a time.

Kohaer transforms your heart rate into a guide to serenity. Thanks to heart coherence—a validated breathing technique—you can soothe your nervous system in just a few minutes a day.

Connect your Bluetooth heart rate sensor (Polar H10 and compatible), follow the breathing circle, and watch your coherence develop in real time.

What you'll find in Kohaer:

• Visual breathing guide—a circle that expands and contracts at your chosen rate (4, 5, 6, or 7 breaths per minute), with an optional sound signal.

• Real-time coherence—your coherence score and heart rate are displayed during the session, measured from your actual heartbeat.

• Customizable sessions—3, 5, 10 minutes, or a personalized duration.

• Clear summary—average score, time spent in coherence, and session graph.

• History—track your progress day after day.

Your privacy, by design.

Kohaer works entirely on your iPhone. No data is collected, no account is created, and nothing is sent to the cloud. Your sessions stay on your own.

Important: Kohaer requires a Bluetooth heart rate sensor (chest strap or digital sensor). The app does not measure heart rate from the phone alone.

Just a few minutes of mindful breathing can change your day. Start now.