SoundMeter - Decibel dB Level

SoundMeter turns your iPhone into a professional-grade decibel meter. Get instant, accurate sound level readings with beautiful real-time waveform and spectrum visualization — all completely free, with no ads and no subscriptions. Whether you need to check noise levels in your baby's nursery, measure background noise before recording, monitor workplace safety compliance, or gather evidence of noise disturbances, SoundMeter delivers precise, trustworthy measurements right from your phone. WHY SOUNDMETER Most sound meter apps are cluttered with ads, lock features behind paywalls, or display unreliable readings. SoundMeter combines laboratory-grade audio processing with a clean, professional instrument interface — and it costs nothing. Every feature is free, forever. KEY FEATURES Real-Time Decibel Measurement See your current sound level displayed on a beautiful arc gauge with animated needle. Watch MIN, AVG, and MAX values update live, with peak hold to catch sudden spikes. Waveform & Spectrum Visualization Toggle between time-domain waveform and frequency-domain spectrum views. Identify noise sources — is it low-frequency rumble or high-pitched whine? The FFT-powered spectrum analyzer shows you exactly where the sound energy is. Measurement History Every measurement is saved automatically with timestamps. Review past recordings, compare levels across different locations, and track noise trends over time. Store up to 1,000 records on-device. Noise Level Reference Guide Built-in reference table with 8 noise levels — from whisper-quiet library (30 dB) to jet engine (130 dB). Instantly understand what your reading means in real-world terms. A/C Frequency Weighting Choose between A-weighted (human hearing) and C-weighted (flat response) measurement modes for different use cases. Dark Mode & Customization Full dark and light mode support with automatic system theme matching. Adjust refresh rate for battery optimization. 100% Private & Offline All data stays on your device. No accounts, no cloud sync, no tracking, no data collection. Your measurements are yours alone. PERFECT FOR - Checking nursery and bedroom noise levels - Pre-recording environment noise checks - Workplace noise safety monitoring - Noise complaint evidence gathering - Concert and event sound level checks - Hearing protection awareness - Environmental noise surveys - Classroom and study environment assessment Download SoundMeter today and know exactly how loud your world is.