Live SPL Meter
Sonance uses the device microphone to estimate sound pressure level in real time. The main meter shows a dramatic 270-degree dial with live min, average, max, and peak readings so you can understand both the moment and the trend.
iPhone and iPad App · v1.1
Sonance
A private, on-device sound-level meter with a live decibel gauge, real-time frequency spectrum, spectrogram, calibration tools, saved-session field reports, and a bundled reference-audio library.
Spectrum and Spectrogram
The Frequency tab turns sound into a live visual field: log-spaced spectrum bars for current energy and a scrolling spectrogram for how intensity changes over time.
A/C/Z Weighting
Switch between A-weighting for everyday listening, C-weighting for louder low-frequency sources, and Z-weighting for a flatter raw view. The app uses tested IEC-style weighting curves in its DSP layer.
Calibration Tools
A calibration slider and bundled 1 kHz reference tone help match Sonance to a known meter when precision matters. The app is clear that phone microphones are not laboratory instruments.
Reference Audio Library
Sonance includes local reference assets: 1/3-octave test tones, a 20 Hz to 20 kHz sweep, white, pink, and brown noise, plus ambience beds for rain, traffic, and cafe murmur. Everything is bundled in the app.
Field Reports
Save numeric session snapshots, then review a local field report with total measurement time, estimated equivalent level, peak, projected dose, time-left estimate, and CSV export. Sessions stay on the device and contain no recorded audio.
Hearing-Safety Context
The safety card uses educational guidance based on the NIOSH recommended exposure limit of 85 dBA for 8 hours with a 3 dB exchange rate. Sonance shows plain-language context and an estimated safe listening time.
Sonance is not a medical device and is not a certified sound-level meter. Readings are estimates from consumer device hardware. Use the calibration feature for better alignment with a known meter.
Private by Design
- No account or sign-in
- No analytics SDKs or advertising identifiers
- No network features in the app
- Microphone audio is analyzed live in memory and is not recorded or uploaded
- Settings, saved session summaries, and CSV field reports remain local on the device unless you choose to share them