Lumisound brings spectrogram analysis, imported file playback, decibel metering, markers, tone generation, and exports into one focused iPhone toolkit. Minimal, direct, and built for actual audio work.
I got tired of not having an audio toolkit in my pocket, so, I made one.
Three focused modes
Analyze audio, generate test tones, or meter the room without jumping between separate utilities.
Choose from four visual themes that recolour the UI and the actual spectrogram heatmap.
What's inside
Full 20Hz to 20kHz logarithmic analysis with smooth, themeable heatmap colours. Watch frequencies unfold live as sound happens.
Open local WAV, AIFF, M4A, or MP3 files from Files, analyze the full recording, then play it back with a visible playhead.
Drag across the graph for an exact frequency and level readout, lock a point in place, and use the loupe for fine detail.
Enable the zoom workspace, pinch into paused spectrograms, pan across the recording, and inspect after zooming.
Drop markers onto interesting moments, add notes, revisit them later, and keep context with saved sessions.
Name saved sessions and reopen previous recordings, markers, and analysis data without rebuilding the session from scratch.
Share spectrogram images, CSV analysis data, WAV audio, full bundles, and decibel trace exports as PNG or CSV.
See the active input and choose connected microphones from Settings when iOS exposes another available source.
No accounts, no tracking, no cloud dependency. Audio stays on-device unless you explicitly import, save, or export it.
A free audio toolkit for iPhone.
Download on the App Store