fastapprox is used at run time in 7 crates (of which 1 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) fastapprox version
120 knyst ^0.3
2 euphony-dsp ^0.3
240 deki optional ^0.3.1
wright_omega dev ^0.3.1