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Show HN: Live breath detection and biofeedback from a phone microphone

Developer Felix Zeller has released the shii·haa app and a browser demo that uses phone microphone audio to deliver live breath detection and biofeedback without wearables. The system uses a rule-based pipeline with signal processing, a breathing state machine, and data-quality checks (augmented by bounded machine learning for refinement), processes audio on-device for privacy, focuses on enhancing self-awareness rather than distraction, and is undergoing clinical validation to assess accuracy in real-world, uncontrolled conditions.