dB Decibel: Sound Level Meter

dB Decibel is an iPhone sound level meter that measures ambient noise in real time in dB(A) with peak hold, and flags when a sound falls below the microphone floor or clips the mic so you can trust every reading. Everything runs 100% on your device with no subscription and no tracking, and audio is never recorded or sent.

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.