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SimpleSpectr is a native macOS app built with SwiftUI that renders an interactive spectrogram of any audio file Core Audio can decode — WAV, MP3, AAC/M4A, FLAC, AIFF, ALAC, and more. You can open files from within the app, drag-and-drop them onto the window, launch them via Finder's Open With, or even capture live audio from the microphone for a real-time spectrogram. Low frequencies sit at the bottom and time advances left-to-right, matching conventional audio-analysis conventions. Hovering the cursor reports exact time, frequency, and dB level with a crosshair, while a separate waveform overview lane stays locked to the same time axis and zoom.
Features
- Multi-format audio support
- Multiple ways to open files
- Live microphone spectrogram
- Interactive hover readout
- Waveform overview lane
- Harmonic cursor
- Measure region
- Spectrum slice
- Built-in player with synced playhead
- Data export
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