Real-time Spectrum Analyzer for macOS using vDSP and AudioUnit. Samples the real-time recorded signal using the build-in microphone and computes single-precision complex discrete Fourier transform of the input from the time to the frequency domain. Friture helps you to understand audio data with several widgets: Friture also provides an audio generator (sine, pink noise, white noise, sweep, burst). It's basically muscle memory, and it's always been the best free analyzer to reach for. So. iSpectrum is an easy to use audio spectrum analyzer that allows you to view live audio in a standard frequency plot, a stereo oscilloscope view and a waterfall display.