Sound Meter: Decibel dB Level
Measure Noise & SPL Detector
$1.99 · Designed for iPad. Not verified for macOS.
Turn your iPhone into a precise sound level meter. Sound Meter measures ambient noise in decibels (dB) using your device's built-in microphone — instantly see how loud your surroundings really are.
Whether you're at a concert, monitoring workplace safety, or checking if toys are too loud, Sound Meter delivers real-time readings with a beautiful, intuitive interface.
KEY FEATURES
- Real-Time Decibel Gauge
Instant SPL readings on a stunning animated gauge with color-coded safety zones. The needle responds smoothly as noise changes around you.
- Live Sound Level Chart
Track noise over time with a scrolling waveform chart. See exactly when spikes happen. The 85 dB danger line is always visible so you know when levels become unsafe.
- Smart Noise Level Indicator
Instantly know if your environment is Quiet, Moderate, Loud, Very Loud, or Dangerous — with real-world examples like "library" or "rock concert" for context.
- Min / Average / Max Tracking
Monitor minimum, average, and maximum dB readings throughout your session. Reset anytime to start fresh.
- Professional Calibration
Fine-tune accuracy with a manual offset slider. Compare against a reference SPL meter and adjust until values match for the best precision your device can deliver.
- Hearing Safety Alerts
Clear visual warnings the moment noise crosses 85 dB — the level where prolonged exposure causes permanent hearing damage.
WHO IS THIS FOR?
- Musicians & Concertgoers — Protect your hearing at rehearsals, gigs, and events.
- Parents — Check if toys, speakers, or headphones are safe for children.
- Workers — Assess workplace noise for occupational safety compliance.
- City Dwellers — Document noise from traffic, construction, or neighbors.
- Students — Learn about acoustics and sound physics with real measurements.
- Anyone Curious — Find out exactly how loud everyday sounds really are.
HOW IT WORKS
Sound Meter uses Apple's AVAudioEngine with Measurement audio mode for the flattest microphone response. The app computes RMS amplitude from raw audio at 44.1 kHz and converts to decibels using standard SPL formulas. Results update 10 times per second.
Note: Smartphone microphones are most accurate between 30–90 dB. Very quiet or extremely loud environments may show reduced accuracy. For lab-grade precision, use a calibrated external microphone.
Download Sound Meter today and understand the sound world around you.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Vladislav Zhirnov, 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
- Seller
- Vladislav Zhirnov
- Size
- 5 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 31 more
- English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © zhirnov.zsystems
