Sound Level Meter: Decibel dB
Noise & SPL Meter, Offline
Free · Designed for iPad. Not verified for macOS.
Sono is a clean, easy-to-read sound level meter that turns your phone into a real-time decibel meter. Measure how loud anything is, right now, in dB(A).
No sign-up, no login, fully offline.
Checking a noisy restaurant, a concert, your AC or PC fans, road and traffic noise, a snoring partner, a baby's room, a workplace or machine shop, or a neighbour's music? Sono shows the sound pressure level (SPL) instantly with a clear live reading, an animated dial, and a scrolling graph.
Why Sono
• Fully offline. No account, no login. Your audio is never recorded or stored and never leaves your device.
• Live dB(A), min / average / max, real-time graph, history and calibration, included.
• Honest readings. A per-device calibration offset lets you trim the reading to match a reference.
Features
• Live decibel meter with a large, easy-to-read dB number
• A, C and Z frequency weighting: dB(A), dB(C), dB(Z)
• Min, average and max for every session
• Real-time scrolling graph, from 30 seconds up to 30 minutes
• Peak hold marker on the dial
• Session timer with pause and resume
• Calibration offset to match a reference level
• Three gauge styles: circular, semicircular, and analog needle
• Reference guide: how loud common sounds are, from a whisper to a jet
• Save measurements with labels and notes, then browse your history
• Add timestamped marks while measuring
• Dark mode that remembers your choice, plus optional haptics
• Lightweight and fast, opens straight to a live reading
How Loud Is It? Quiet library ~30–40 dB · normal conversation ~60 dB · busy traffic ~70–80 dB · lawn mower ~90 dB · nightclub ~100 dB · rock concert ~110 dB. Sono labels the live reading against everyday sources so the numbers actually mean something.
Great For
• Checking whether a venue, restaurant or workplace is too loud
• Settling neighbour noise disputes
• Calibrating speakers, home theatre and audio gear
• Measuring appliances, fans, engines and machinery
• Anyone curious how loud their world really is
A Note on Accuracy: Phone microphones are tuned for voice and can clip at very high volumes, so readings are approximate. Sono is a reference tool and is not a replacement for a certified sound level meter (SLM). Use the calibration offset to align Sono with a known reference for more reliable results.
Sono is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. Not a certified sound level meter, for reference only.
Sono: the simple, offline decibel meter.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes
The developer, Hritik Arthur, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hritik Arthur
- Size
- 8.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © 2026 H. Arthur