dBA
A-weighted estimates
See a Fast-response estimate of environmental sound level from the iPhone microphone.
Environmental sound level meter for iPhone
Decibel Pro
Estimate A-weighted sound levels, follow LAeq and recent trends, and keep useful context with local recordings and sound-level camera watermarks.
Understand the sound around you.
Start a session with one tap, watch the level change, and save the measurement with the details you need to review it later.
AVG
LAeq and trends
Follow current, average, minimum, and maximum levels together with the recent trend.
85
Exposure guidance
Receive sustained high-level alerts and practical reference guidance for time around loud sound.
REC
Local recordings
Completed sessions keep a compressed field recording on this device for later playback.
BG
Background measurement
Continue an active session when switching apps or locking the iPhone when enabled in Settings.
CAM
Sound-level camera
Capture photos and videos with the current sound level included as a visible watermark.
Useful context, not just one number.
Label a session as Home, Office, Commute, Concert, or another scene. Review its duration, trend, exposure estimate, and recording together in History.
If you have access to a trusted calibrated sound level meter, Advanced Calibration lets you apply a reference offset for your device.
Decibel Pro provides consumer-grade estimates. Results vary by iPhone model, microphone condition, case, placement, and environment, and are not a substitute for certified professional measurements.
Your measurements stay with you.
No account is required, and the core experience is designed to work on device.
Read the full Privacy Policy for details about local recordings, permissions, deletion, and support messages.
On-device analysis
Sound-level analysis is performed locally and is not automatically uploaded.
Local history
Measurement history and associated recordings remain on your iPhone.
You control media
Photos and videos are created only when you capture them and save to your photo library.
Simple deletion
Delete one session or all measurement data, including the related local recordings.