Vagal HRV: Guided Breathing

Vagal HRV measures heart rate variability (HRV) with chest-strap accuracy and trains your breathing with real-time biofeedback.

FREE, NO SUBSCRIPTION

No ads, no mandatory account, no hidden paid tier. Everything below is available from the first time you open the app.

START WITH NO SENSOR AT ALL

Guided breathing runs on the phone alone: pick a protocol (Coherence 6, Box 4-4-4-4, Relax 4-7-8, extended exhale), follow the pulsing circle, done. No strap, no account, no subscription.

When you want to measure your HRV, that's when the Polar H10 comes in.

KEY FEATURES

• Guided breathing — a pulsing circle and soft tones in 4 phases, with ready-made protocols. Works with no sensor.
• Reliable HRV — RMSSD, SDNN and max/mean/min heart rate from the Polar H10's true RR intervals.
• Readiness — a score compared with your own baseline, with a green/amber/red light.
• Cardiac coherence (RSA) — watch your heart rate oscillate in sync with your breath, live.
• Coherence training — a daily program with a streak and a goal that grows weekly.
• Resonance frequency finder — discover the breathing rate that most amplifies your HRV.
• Context tags — log sleep, alcohol, training and stress, and see what moves your numbers.
• Trends and history — 7 and 30-day averages, best time of day, CSV and PDF export.
• 10 languages.

WHY A CHEST STRAP?

Watches and rings estimate heart rate from light (PPG). The Polar H10 is a chest strap that measures beat-to-beat intervals directly, the gold standard for HRV — far more reliable RMSSD and SDNN.

PRIVACY

Your data stays on your device. You decide when to export or share.

IMPORTANT NOTICE

Vagal HRV is for wellness and sporting purposes only. It is not a medical device and does not diagnose, treat or prevent any disease.

Polar and Polar H10 are trademarks of Polar Electro Oy. This app is not affiliated with Polar Electro Oy.