Decibel Meter: Sound Level dB
Studio dBA & SPL Calibration
Only for iPhone
Free · In-App Purchases
iPhone
v2.0 is here. New spectrum analyser. New noise dosimeter. Calibrated dBA you can trust at a gig, a building site, or in your studio. Privacy first. Nothing recorded.
Real-time decibel readings for real ears. Decibel Meter turns your iPhone into a calibrated dBA sound level meter that audio engineers, musicians, site workers, and parents worried about their kids' hearing can actually trust.
Open the app. The animated gauge moves with the room. Green for quiet. Yellow when you reach conversation. Red when sound levels start damaging hearing. You see the number, the colour, and the trend at the same time.
This is a v2.0 rebuild. Every screen redrawn. New spectrum analyser. New noise dosimeter. Full calibration workflow. Built for people who know what dBA means and built so people who do not will still get a useful answer in three seconds.
CORE MEASUREMENT
Live dBA readout updates 30 times per second
Colour-coded zones for hearing safety (Green under 70, Yellow 70 to 85, Red above 85)
Min, average, maximum, and Leq running stats
Peak hold for transient events like clap tests
Calibration offset so your iPhone matches a reference SPL meter
A, C, and Z weighting curves for professional use
SPECTRUM ANALYSER
Real-time FFT spectrum view
1/1 and 1/3 octave bands
Frequency cursor with exact Hz readout
Magnitude in dB SPL
NOISE DOSIMETER
NIOSH and OSHA exposure calculations
Cumulative dose timer
Threshold alerts when you cross safe exposure
Daily exposure summary
EXPORTS
Save sessions as CSV or share as image
Time-stamped measurement logs
Notes field for context (which room, which source, which mic position)
REFERENCES
Built-in noise reference guide from whisper at 30 dB to jet engine at 140 dB
NIOSH hearing-loss exposure chart
OSHA permissible exposure limits
WHO THIS IS FOR
Audio engineers checking room tone, monitor levels, and mix decisions
Musicians and producers calibrating studio listening volume
Live sound engineers verifying FOH and stage levels at gigs and rehearsals
Construction, manufacturing, and trade workers monitoring workplace noise
Parents, teachers, and event organisers protecting hearing in shared spaces
DIY enthusiasts comparing appliances, boilers, vehicles, and quiet test environments
CALIBRATION YOU CAN TRUST
The iPhone microphone is excellent. It is not laboratory grade. We give you a one-tap calibration workflow so you can offset your readings against a known reference. Without calibration we still produce useful relative numbers. With calibration you produce numbers you can stand behind in a noise complaint, an exposure log, or a mix session.
PRIVACY FIRST
Audio is analysed on device in real time. Nothing is recorded. Nothing leaves your iPhone. The microphone stops the moment you close the screen.
NO ACCOUNT, NO TRACKING
You never sign in. We never ask for an email. We never see your sound.
PROFESSIONAL ACCURACY NOTE
This app is a tool for monitoring and education. For HSE enforcement, occupational noise compliance, or medical hearing assessment, use a Type 1 or Type 2 certified sound level meter operated by a qualified professional.
Open the app. See the number. Know what it means.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
- New spectrum analyser with 1/1 and 1/3 octave bands
- New noise dosimeter with NIOSH and OSHA exposure calculations
- A, C, and Z weighting curves with one-tap calibration workflow
The developer, Cloud Motion Lab LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Cloud Motion Lab LLC
- Size
- 27.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime USD 4.99
- Pro USD 29.99
- Pro USD 3.99
- Copyright
- © 2026 Cloud Motion Lab LLC