radioCREEP vs SoundMeter

RADIO CREEP: Audio Signal Analyzer transforms your iPhone into a professional-grade acoustic analysis tool. Built with Apple’s high-performance Accelerate Framework (vDSP), it enables researchers, audio engineers, and students to record audio and instantly generate core signal processing metrics for deep insights into sound dynamics. Key features include: - Real-time recording and analysis: Record up to 90 seconds of audio directly on your device. The app analyzes the recording rapidly upon stopping. - Loudness dynamics (RMS profile): View a detailed plot of the Root Mean Square (RMS) energy over time, showing normalized loudness dynamics and identifying patterns of steady sound (music) versus transient spikes (speech/sports commentary). - Acoustic stability score: Automatically calculates a stability metric based on the variance of the RMS energy, predicting the content type (scores below approx 0.15 indicate steady Music; higher scores suggest dynamic Talk/Sports). - Frequency fingerprint (Average FFT): Instantly compute and plot the Average Fast Fourier Transform (FFT) magnitude spectrum, revealing characteristic frequency components masked.

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.