DecibelZen: Sound dB SPL Meter

DecibelZen is an accurate sound meter, decibel meter, and SPL meter designed to monitor environmental sound pressure levels (SPL) in real time. Built with a calm aesthetic and powered by digital signal processing (DSP), DecibelZen functions as a reliable dB meter and noise detector for home, workplace, and studio noise measurement. Whether checking neighborhood noise, testing audio speakers, or tracking decibel levels to protect your hearing, this sound level meter provides clear acoustic insights without clutter or intrusive interruptions. KEY FEATURES • Real-Time Sound Meter: Measure sound pressure levels (dB SPL) with a fluid 270-degree circular gauge featuring smooth spring physics. • Min, Avg & Max Analytics: Instant tracking of lowest sound levels (MIN), continuous RMS average (AVG), and maximum peak hold (MAX). • Live Waveform Oscilloscope: Real-time 30-second audio waveform graph with visual alerts for the WHO 85 dB safety threshold. • Accurate SPL Meter Calibration: Fine-tune readings by +/- 10.0 dB in 0.5 dB increments to match reference sound meters. • WHO Hearing Protection Scale: Integrated noise reference guide based on World Health Organization auditory safety standards. • OLED Dark Theme: Battery-friendly, distraction-free interface engineered with Material Design 3 for high-contrast visibility. • 100% Privacy by Design: Ephemeral RAM-only audio processing. This dB meter never records, saves, or transmits your audio. NOISE REFERENCE LEVELS (WHO GUIDELINES) • 20–30 dB: Whispering, rustling leaves (Very quiet) • 40–50 dB: Quiet library, peaceful bedroom (Comfortable) • 60–70 dB: Normal conversation, background office noise • 75–80 dB: Heavy city traffic, vacuum cleaner (Loud) • 85 dB: Critical threshold – prolonged exposure (>8h) risks hearing damage • 90–100 dB: Lawnmower, power tools (Hazardous without ear protection) • 110–120 dB: Rock concert, emergency siren (Immediate hearing risk) • 130+ dB: Threshold of physical pain and acoustic trauma PRACTICAL USE CASES • Neighborhood Noise Detector: Objectively measure noise disturbances from construction, loud music, or pets. • Workplace Safety: Monitor hazardous decibel levels aligned with OSHA and NIOSH occupational noise standards. • Audio & Studio Testing: Calibrate home theaters, studio monitors, speakers, and room acoustics with precision. • Sleep & Wellness: Ensure bedrooms, nurseries, and study spaces maintain quiet ambient decibels. FAQ & IMPORTANT NOTICE Q: Can this replace a certified physical sound level meter? A: Smartphone microphones are calibrated primarily for human speech. While DecibelZen uses advanced DSP calculations and custom calibration, it is designed for personal, educational, and situational noise measurement, not legal certification. Q: Does DecibelZen store or share voice audio? A: No. Audio is processed solely in volatile RAM to compute decibels and is discarded immediately. No recordings are ever saved to disk or transmitted. Download DecibelZen: your trusted sound meter, decibel meter, and dB meter for calm, accurate, and private noise measurement.