spectrum-analyzer is used at run time in 10 crates (of which 1 optionally). It is a direct run-time dependency in 7 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) spectrum-analyzer version
700 fftviz ^1.5.0
750 1 ensnare optional ^1.5.0
2 audiovis ^1.2.6
integer_array ^1.1.2
beat-detector ^1.1.0
onshape-level-gen ^1.2
dmxvis ^1.5.0
110 2 lowpass-filter dev ^1.1
2 audio-visualizer dev ^1.4.0