Spectral Field is a free live spectrogram online and FFT audio spectrum analyzer that runs entirely in your browser. Load an audio file (WAV, MP3, FLAC, OGG, M4A) or use your microphone to turn sound waves into a real-time spectrogram — frequency, loudness (dB) and time — rendered as an interactive 3D surface you can orbit or read flat like a 2D spectrogram, with peak frequency and musical note detection, RMS level, spectral centroid, log or linear frequency axes, and A/B track comparison. Nothing is uploaded; all analysis is done locally on your device. (A spectrogram is sometimes spelled "spectogram.") Part of songtools.music. See the legal disclaimer.
3D FFT analyzer · x·freq y·dB z·time
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A free live spectrogram. Drop an audio file anywhere, open one, use your mic, or run the demo signal — and watch its sound waves render as a live 3D FFT surface (or read it flat in 2D) on your GPU. Nothing is uploaded.