NoiseGauge - Sound Meter

NoiseGauge uses your iPhone's built-in microphone to estimate ambient sound levels. No external hardware is required. Basic measurements are unlimited, work offline, and include a complete result when you stop. FEATURES • Real-time dB reading with a large, readable gauge • Current, minimum, average, and peak values for the full session • 30-second rolling waveform chart • Exposure guidance and a complete result after every check • Noise reference table with real-world examples • Manual calibration if you have a trusted reference sound source • Fully offline — no network, no tracking, no ads NOISEGAUGE PRO • Give checks a name and choose a context such as home, work, sleep, or outdoors • Keep up to 100 records on your device • Open a record for its statistics and saved trend • Compare two rooms or time periods side by side • Use calibration and reference tools HOW IT WORKS NoiseGauge reads microphone input, computes the average power in dBFS, then applies a calibration offset to estimate sound pressure level (SPL). The default +100 dB offset works well for most iPhone models. You can fine-tune the offset against a trusted reference meter if closer comparison matters. IMPORTANT NOTE Smartphone microphones are not laboratory-grade instruments. NoiseGauge provides estimates suitable for general awareness, not regulatory or medical decisions. For compliance measurements, use a certified Type 1 or Type 2 sound level meter. PRIVACY Microphone audio is analyzed in real time and never recorded, stored, or transmitted. No analytics, no ads, no account required. SUBSCRIPTION INFO • Payment will be charged to your Apple ID account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. • Your account will be charged for renewal within 24 hours prior to the end of the current period. • You can manage and cancel your subscriptions by going to App Store → Account → Subscriptions. Privacy Policy: https://frexx.top/noisegauge/privacy.html Terms of Use (EULA): https://frexx.top/noisegauge/terms.html Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ SUPPORT jie.xiang.jm@gmail.com