ic_principal is used at run time in 154 crates (of which 4 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) ic_principal version
52K 170 candid ^0.1.0
32K 35 ic-stable-structures ^0.1.1
1.9K 1 ic-signature-verification ^0.1