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Know exactly how loud it is — instantly, privately, no sign-up required.
Sound Level Check turns your phone into a precise, A-weighted decibel meter — instantly, privately, with no sign-up required. Point it at any environment — your home, office, a concert, traffic — and see exactly how loud it is in real time, measured against the same dB-A weighting used by professional sound level meters. REAL-TIME METERING • Live analog gauge with a smooth, damped needle — no jumpy readings • Large, always-readable dB-A number, updated continuously • Rolling 30-second graph so you can see trends, not just a snapshot • Live MIN / AVG / MAX tracking, running even before you hit record KNOW WHAT THE NUMBER MEANS Tap the reference chip to open a full reference chart, from a whisper (30 dB) to a jet takeoff (130 dB), with your current reading highlighted live as it changes. CALIBRATE IN SECONDS Compare against a reference sound level meter and dial in a simple +/- offset, with a live "after calibration" preview. No confusing formulas. SESSION HISTORY, NUMBERS ONLY Start a recording and Sound Level Check logs your MIN, AVG, and MAX dB-A, plus your session's loudest moment — automatically saved to your history, with full session detail and export as an image or CSV. NOISE LIMIT ALERTS Set a dB-A threshold — 85 dB is a common hearing-safety guideline — and feel a vibration alert the moment your environment crosses it. PEAK HOLD Freeze the loudest moment on screen while the meter keeps running underneath, handy for spot-checking a reading without missing it. PRIVATE BY DESIGN Sound Level Check never records, stores, or transmits audio. Only numeric dB-A readings are logged, and they stay on your device. No accounts, no cloud sync, no sign-up, ever. Free to use, supported by a small, restrained banner ad. A one-time purchase removes ads for good — no subscriptions, ever. Note: phone microphones are tuned for voice and can be limited at very high sound levels, so treat readings as a helpful guide rather than a lab-certified measurement.