Inside the app
A closer look.
About this app
Made for a clear purpose.
Sonance turns your iPhone into a beautiful, instant sound-level meter — and makes a raw number actually mean something.
Point it at the world and watch a high-fidelity decibel gauge swing in real time, see the room's frequencies dance across a live spectrum, and get a plain-language read on whether what you're hearing is safe for your ears. No setup, no sign-up, no waiting.
No ads. No account. Nothing leaves your phone.
— A METER THAT LOOKS AS GOOD AS IT MEASURES — • A dramatic, animated decibel dial with a smooth needle and crisp readout • Live MIN / AVG / MAX / PEAK so you can capture a moment or watch a trend • Six hand-tuned themes — Aurora, Inferno, Mono, Neon, Ocean, Sunset — pick your vibe
— SEE THE SOUND — • A real-time frequency spectrum that reacts to every voice, beat, and rumble • A scrolling spectrogram heat-map — time, frequency, and intensity in one stunning view • A / C / Z frequency weighting, the way real sound meters work
— KNOW WHEN IT'S TOO LOUD — • Clear hearing-safety guidance based on the NIOSH limit (85 dBA for 8 hours) • A live "safe listening time" estimate as levels rise • A reference ladder of everyday sounds — "≈ city traffic," "≈ rock concert" — so the numbers click
— A REFERENCE LIBRARY IN YOUR POCKET — • Pure 1/3-octave test tones, a full 20 Hz–20 kHz sweep, and white / pink / brown noise • Calming ambience beds — rain, traffic, café — to compare and demo • A 1 kHz reference tone to help you calibrate against a known meter
— PRIVATE BY DESIGN — Sonance works 100% on your device. The microphone is used only to measure sound in the moment — audio is never recorded, saved, or sent anywhere. No accounts, no tracking, no network. Ever.
Great for noisy restaurants, concerts, the gym, power tools, a baby's room, a too-loud AC, a home studio, or just satisfying curiosity about how loud the world really is.
Note: iPhone microphones aren't laboratory instruments. Sonance shows an estimated SPL and includes a calibration control so you can dial it in. Hearing-safety figures are educational, not medical advice.
Built for fast, private sound checks wherever you are.
New in 1.1: Saved-session field reports summarize total measurement time, estimated equivalent level, highest peak, projected dose, time-left estimate, and CSV export. Reports are numeric only and contain no audio.
