Decibel X - dB Sound Level Meter, Noise Detector

Decibel X - dB Sound Level Meter, Noise Detector transforms your smartphone into a professional-grade sound measurement instrument with pre-calibrated accuracy that rivals dedicated SPL devices. Whether you're curious about ambient noise levels, assessing workplace safety, or analyzing audio quality, this app delivers precise decibel readings you can trust.

Accuracy and reliability form the foundation of this sound meter app. Every measurement is calibrated against real sound level meters, and the app supports industry-standard frequency weightings including ITU-R 468, A, B, C, and Z. This means whether you're measuring the ambient noise in your office, evaluating a concert venue, or conducting noise analysis for professional purposes, the data you get reflects genuine acoustic conditions. A built-in spectrogram and FFT analyzer reveal the frequency composition of sound in real time, making it invaluable for musicians, audio engineers, and anyone serious about sound quality assessment.

Capture and share your findings effortlessly. The InstaDecibel feature overlays your dB readings directly onto photos, perfect for documenting noise conditions and sharing via social media. Historical recording data saves automatically, and each record exports as high-resolution PNG graphs or CSV files for deeper analysis or presentation. The intuitive interface displays current, average (Leq), and maximum sound levels simultaneously, with both digital and analog gauge options for quick reference.

Advanced measurement capabilities include NIOSH and OSHA dosimeter standards for occupational health monitoring, three response time modes (SLOW, FAST, IMPULSE), and a measurement range spanning 20–130 dBA. Visual tools like histogram graphs, waveform displays with rolling and buffer modes, and a real-time frequency scale chart help you understand sound behavior over time. For extended monitoring sessions, the "Keep Device Stay Awake" option ensures uninterrupted recording without screen timeout interruptions.

Flexibility extends to calibration. While most devices arrive pre-calibrated for reliable everyday use, the trimming calibration range of -50 to +50 dB allows fine-tuning when comparing against external reference meters for professional-grade precision. Pause, resume, and reset functions give you complete control during measurement sessions.

Whether you're an audio professional, occupational health specialist, or simply curious about the sound world around you, Decibel X - dB Sound Level Meter, Noise Detector provides the accuracy, depth, and ease of use professionals demand from a mobile measurement tool.