HRVibe is a live HRV biofeedback app for iPhone and Apple Watch. Breathe with guided patterns — resonance, box breathing, extended-exhale — while your Watch streams real heart data back as RMSSD, so you see your own vagal activation happen in real time. Binaural tones and custom soundscapes deepen the effect. Session history tracks HRV trends over time, with coaching insights and streaks. Built on HealthKit — your data stays yours. Made solo, in spare evenings, to help someone breathe easier.