dB Sound Level Meter & Noise

Most decibel apps show you a number and hope you don't ask questions. This one shows you the number, tells you which scale it's on, and lets you correct it. WHAT YOU GET - A, C and Z frequency weighting — with a plain-English explanation of what each one does, right next to the switch - Fast (125 ms) and Slow (1 s) time weighting, to IEC 61672 - MIN, AVG and MAX for every session, with MAX built to hold short, sharp sounds instead of averaging them away - A calibration offset you control, ±30 dB, saved between sessions - HOLD to freeze the display without stopping the measurement - Session history, with undo on every destructive action BUILT NOT TO BREAK - Keeps measuring when you plug in headphones, connect Bluetooth, or switch back to the built-in mic — and tells you when the input changed - Handles low sample-rate inputs instead of refusing to work. If your Bluetooth headset runs at 16 kHz, the app says so and tells you the frequency range it can still cover - Comes back on its own after a phone call, an alarm, or a trip to another app. No restart, no lost session - Measures while your music, podcast or call keeps playing HONEST ABOUT WHAT IT IS This is a phone app using a phone microphone. It is not a certified sound level meter. Don't use it where a Type 1 or Type 2 instrument is required, or as the basis for a legal, medical or workplace decision. The colour zones on the dial are guidance, not a verdict. Readings depend on your device, the microphone in use, and your calibration setting. If the absolute level matters to you, set the calibration offset against a reference meter first — that's what the slider is for. FREE, AND STAYING THAT WAY No subscription. No sign-in. No account. No paywalled features. Works with no internet connection at all. Supported by ads.