About HearHz
HearHz is a free online hearing screening tool built with modern web technology. Using the Web Audio API, it generates calibrated pure tones at standard audiometric frequencies to test your hearing threshold.
Results are displayed as a clinical-style audiogram — the same format used by audiologists worldwide. You can track changes in your hearing over time with the built-in history feature.
How It Works
HearHz uses your browser's Web Audio API to generate precise sine wave tones at frequencies from 250 Hz to 16,000 Hz. The test follows a modified Hughson-Westlake method — the gold standard for determining hearing thresholds:
- Tones start at a moderate level and decrease in 10 dB steps
- When you can no longer hear, the level increases in 5 dB steps
- Your threshold is the quietest level you can reliably detect
Warble tones (slight frequency modulation) are used to prevent standing waves in your ear canal, improving accuracy with consumer headphones.
Privacy First
All processing happens entirely in your browser. No audio is recorded, stored, or transmitted to any server. Test results are saved only in your browser's local storage — you own your data completely.
Important Limitations
This is a screening tool, not a replacement for professional audiometric evaluation. Consumer headphones cannot match the calibration precision of clinical audiometers. If your results suggest hearing loss (any frequency above 25 dB HL), please consult an audiologist or ENT specialist.
Technology
- Web Audio API (OscillatorNode, StereoPanner)
- ECharts for clinical-style audiogram visualization
- 100% client-side — no server, no database, no accounts