Maturin is used at run time in 1 crate (of which 1 optionally). It's used at build time in 1 crate. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) Maturin version
2.5K nucleation optional ^1
2.0K direct-neural-biasing optional build ^1.5.1
2.1K 3 mdka dev ^1