dB Meter: Sound & Noise Level

dB Meter turns your smartphone into an accurate sound level meter, decibel reader, and noise detector. Measure sound pressure level (SPL), analyze frequency spectrums, and track environmental noise exposure at work, home, or live events. A complete acoustic utility designed for instant sound checks and detailed decibel measurement sessions.

📊 ACOUSTIC MEASUREMENT & ANALYSIS
• Real-time sound pressure level (SPL meter) in dBA, dBC, and dBZ (flat) frequency weighting.
• dBA meter weighting models human hearing curves; dBC captures industrial and low-frequency bass energy.
• Fast (125 ms) and Slow (1 s) response times for steady baselines or fluctuating sound levels.
• Acoustic metrics: Instant SPL, Min (Lmin), Max (Lmax), Energy Average (Leq / LAeq), and Peak (LCpeak).
• Visual VU meter display and digital loudness meter with quiet, moderate, and hazardous sound zones.

🛡️ HEARING CONSERVATION & NOISE DOSIMETER
• Sound dosimeter tracking: Monitor daily sound dosage and continuous noise exposure (Leq).
• Built-in exposure limits based on NIOSH sound level meter and OSHA hearing safety standards.
• Customizable noise detector alarm notifies you when decibels exceed safe hearing thresholds.
• Prevent acoustic fatigue and monitor loudness at concerts, rehearsals, workshops, and motorsports.

📉 FREQUENCY & AUDIO SPECTRUM
• Real-time audio analyzer (RTA): 28 third-octave acoustic bands from 31.5 Hz to 16 kHz.
• 20-second rolling audio spectrogram to visualize sound patterns and measure sound frequency.
• Pinpoint low-frequency noise: HVAC hum, heat-pump drone, and subwoofer room resonance.

📈 DECIBEL REFERENCE & SAFETY LIMITS
• 30 dB — Quiet library, whisper
• 60 dB — Normal conversation, office ambient
• 80 dB — Heavy street traffic, busy restaurant
• 85 dB(A) — NIOSH recommended limit (max 8 hours daily without hearing protection)
• 95 dB(A) — Heavy power tools: safe exposure drops under 1 hour
• 100+ dB — Live music, sirens: immediate hearing protection recommended

💡 PRACTICAL SOUND MEASUREMENT USES
• Hearing safety: Check sound exposure at concerts, music rehearsals, and machine shops.
• Car audio decibel meter: Test vehicle exhaust loudness, car audio systems, and cabin acoustics.
• Workplace monitoring: Conduct preliminary occupational noise surveys and sound tests.
• Noise logging: Document neighbor disturbances and traffic with time-stamped noise logs.
• Audio & Hi-Fi: Balance speakers, calibrate subwoofers, and assess room acoustics.
• Appliances: Verify sound ratings of heat pumps, ventilation fans, and home appliances.

📁 DATA LOGS, PERCENTILES & EXPORT
• Sound tracker history with custom notes, timestamps, and acoustic percentiles (L10, L50, L90).
• Visual session trend charts and CSV export for Excel, Google Sheets, or reports.

🎛️ CALIBRATION & ACCURACY
• Single-offset calibration against an external Class 1 or Class 2 reference sound level meter.
• Hold the phone at arm's length; remove thick cases for unhindered microphone response.

🔍 HONEST ACCURACY & DISCLAIMER
Smartphones are not certified Class 1 or Class 2 sound level meters (IEC 61672) or dedicated industrial noise dosimeters. Readings are estimates (typically 30–110 dB) based on device hardware. Not intended for legal, statutory, or medical workplace compliance.

🔒 PRIVATE & ON-DEVICE
• All acoustic analysis runs locally. Audio is never recorded, saved, or uploaded.
• 100% offline, zero trackers, and no account required.