ic_principal is used at run time in 195 crates (of which 4 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) ic_principal version
75K 203 candid ^0.1.0
39K 40 ic-stable-structures ^0.1.1
5.8K 2 ic-signature-verification ^0.1
mu-sdk ^0.1.1