SoundMeter: Decibel dB

Turn your iPhone into a professional decibel meter. Real-time dB with A/C/Z weighting, spectrum analyzer, session recording, and NIOSH exposure guide.

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.