iOS · Audio tools
Spectrum Analyzer – Audio FFT
Real-time microphone spectrum analysis on device: FFT visualization (roughly 20 Hz–20 kHz), spectrogram, peak readout and hold, band meters, display controls, freeze, and an optional one-time Pro unlock via Apple In-App Purchase for higher FFT resolution, advanced meters, reference tones, THD, howl detect, and related analysis tools. No accounts. No developer backend.