dB Decibel: Sound Level Meter

Honest, accurate metering. Pro adds Evidence Mode, Sound ID, Live Activity, exposure/dose, octave bands and more — for one fair one-time price. No subscription. Ever.

dB Decibel is the most honest, capable sound level meter on your iPhone — and the only one that fixes the #1 complaint about decibel apps: accuracy.

Most meters read 50–60 dB in dead silence and cap loud sources. dB Decibel is honest: it tells you when you are below the mic floor and when a sound clips the mic, so you trust every reading.

One fair price. No subscription, no tracking. Everything runs 100% on your device. Audio is never recorded or sent.

WHAT'S FREE

• Live dB(A) sound level meter with peak hold
• Clipping + near-silence detection — honest readings
• Real pro metrics: Leq, L10 and L90
• Safe-listening time estimate (informational)
• Dominant frequency, min/avg/max, live graph
• "How loud is it?" reference scale
• One-tap guided calibration, landscape, share card
• Start/stop from Siri, the Action Button and Control Center

dB DECIBEL PRO — one-time purchase

• Evidence Mode: timestamped noise-event log with a landlord/HOA-ready PDF and CSV
• Live Sound ID: on-device "what is this noise?"
• Live Activity + Lock Screen / Home Screen widgets
• Exposure & dose: LAeq, 8-hour TWA, daily-dose % (informational)
• Octave-band analysis and a test-tone generator
• Sleep Soundscape: overnight room-noise timeline
• External & Bluetooth mic support with per-input calibration
• Real-time spectrum analyzer, loud-level alerts, A/C/Z weighting, fine trim
• Session history with auto-save, and removes ads

No subscription. Ever. Pay once, keep it forever.

Note: dB Decibel is an environmental sound-measurement tool, not a hearing-protection, occupational or medical device. Dose, exposure and safe-time figures are informational; readings are approximate and uncalibrated.