Decibel Meter - Sound Recorder
Turn your iPhone into a high-precision sound level meter. Real-time noise checks, spectrum analysis, exposure tracking, and evidence recording in one place.
Real-time Measurement
Core Features
Multiple Weighting Modes
Calibrated dB readings with A/B/C/Z and ITU-R 468 support.
Real-time Spectrum
High-speed FFT shows the full 20Hz–20kHz distribution.
Noise Exposure Tracking
OSHA/NIOSH Dose and TWA with smart risk alerts.
Recording for Evidence
Measure and record simultaneously, with background support.
iCloud Sync
Sync measurements and recordings across devices.
Professional Reports
Export PDF reports with trends, max/min/avg values.
Common Scenarios
Neighbor Noise Evidence
Record renovation or party noise levels and audio for disputes.
Sleep Environment
Check bedroom background noise and find what disrupts rest.
Workplace Assessment
Monitor exposure at factories, sites, or offices to protect hearing.
Appliance Testing
Verify AC, fridge, or ventilation noise against limits.
High-noise Protection
Monitor levels at concerts and clubs to avoid hearing damage.
Privacy & Compliance
Microphone access is only for sound analysis. Audio is processed and stored locally or in your private iCloud, never on third-party servers.