SoundMeter: Decibel dB

Measure sound levels with professional-grade accuracy. SoundMeter turns your iPhone into a powerful decibel meter with real-time dB readings, spectrum analysis, and session recording.

REAL-TIME SOUND MEASUREMENT
- Instant decibel (dB) readings with A, C, and Z frequency weighting
- Fast and slow time weighting for different measurement needs
- Live min, max, average, and peak level tracking
- Color-coded safety categories based on NIOSH exposure guidelines

VISUAL SOUND ANALYSIS
- Beautiful arc gauge with smooth animated needle
- Scrolling timeline graph showing sound levels over time
- Color gradient from safe green through warning orange to danger red
- Sound level reference chart comparing to everyday sounds

SESSION RECORDING & HISTORY
- Record measurement sessions with one tap
- Review past recordings with full statistics
- Timeline graph replay of recorded sessions
- Organized history with date, duration, and average level

PRO FEATURES (One-Time Purchase)
- Spectrum Analyzer: 32-band FFT frequency visualization
- Unlimited session history (free tier: 3 recordings)
- CSV data export for professional reports
- Calibration profiles for different environments
- Threshold alerts with haptic feedback

SOUND REFERENCE GUIDE
- Compare your readings to common sounds (whisper to jet engine)
- NIOSH safe exposure time recommendations
- Understand noise risk levels for hearing protection

PERFECT FOR
- Workplace noise assessment and OSHA compliance
- Environmental noise monitoring
- Music and event sound level checking
- Hearing health awareness
- Classroom and office noise management
- Construction site safety monitoring

Built with professional audio engineering principles including IEC 61672 frequency weighting standards. While not a replacement for calibrated professional equipment, SoundMeter provides reliable relative measurements for everyday noise awareness and safety.