Decibel Meter | Sound Level vs SpecWave

Decibel Meter turns your phone into a clear, no-fuss sound level meter. Open it and measuring starts right away. FEATURES - Real-time dB from the microphone, refreshed every 100 ms, range 0 to 130 dB - Arc gauge with a needle and large readout, dark theme with a neon green accent - Live line graph of recent noise, with the 85 dB risk line marked - Minimum, average and maximum dB plus elapsed time in one stats bar - Six noise levels with everyday examples: leaves, a library, conversation, a vacuum cleaner, the subway, a concert - Red banner and haptic vibration above 85 dB to protect your hearing - Threshold alerts at 60, 70, 80, 85 or 90 dB while you are measuring - Saved records with date, duration, min, average and max dB, noise grade, a note and labels such as home, work, cafe or street - CSV export, and share a measurement as an image - Spectrum visualization with 16 bars from 31 Hz to 16 kHz - Noise guide with WHO and NIOSH safe exposure times: 60 dB unlimited, 85 dB about 8 hours, 90 dB about 2 hours WHO IT IS FOR Residents with noisy neighbors, students comparing study spots, parents watching the nursery, and anyone who works in a loud place. PLEASE NOTE This is a reference tool. Smartphone microphones vary, so readings can be off by around 5 dB, and the app is not suitable for precision acoustic measurement or as legal evidence. PRIVACY The microphone is used only for live dB measurement. No audio is recorded, stored or sent anywhere. Records stay on your device: no account, no server. Free, supported by ads.

Key Features Real-time Spectrum Analysis (See Your Sound) - Instant Visualization: Captures ambient sound via microphone and presents it in beautiful "Line" or "Bar" chart styles, making pitch and volume crystal clear. - Key Data Capture: Displays the current peak frequency and total decibel level in real time, while automatically logging the maximum and minimum decibels for your session. - One-Tap Display Freeze: Tap the spectrum chart anytime to freeze the current frame, allowing you to observe and compare sound details at your own pace. - Multi-Source & Parameter Toggles: Switch between built-in and external microphones with a single tap, and toggle between log/linear frequency axes to suit your needs. - Microphone Gain Control: Easily adjust input sensitivity to your liking. *(Note: This app outputs raw relative values only; for high-precision acoustic measurement, please calibrate with a sound level meter first)* Audio Signal Generation (A Fun Health Check for Headphones & Speakers) - 3 Classic Waveforms: Built-in sine, square, and triangle wave audio signals to instantly turn your phone into a versatile sound transmitter. - Fun Dynamic Frequency Sweeps: Supports fixed frequency playback alongside single, loop, or round-trip dynamic sweep modes. Easily test speaker bass depth or fine-tune audio gear. - Precise Gesture Tuning: Use smooth swipe gestures for silky, precise micro-adjustments to both output frequency and volume gain. Common Use Cases - Measure room insulation or ambient noise decibels at home or in the office. - Test newly purchased headphones or speakers to see if the bass is deep enough and the treble is crisp. - Assist with instrument tuning by viewing the exact sound pitch and frequency. - Explore fun acoustics by playing curious sweep tones with the signal generator.