stringprep is used at run time in 342 crates (of which 73 optionally, 4 directly). It's used only as a dev dependency in 16 crates.

Depender (with downloads and own rev deps) stringprep version
81K 7 postgres-protocol ^0.1
46K 6 sqlx-core ^0.1.2
24K 52 mongodb ^0.1.2
230 4 pdf ^0.1.2