Ocb3 is used at run time in 21 crates (of which 1 optionally). It is a direct run-time dependency in 1 crate. It's used only as a dev dependency in 2 crates (of which 1 directly).

Depender (with downloads and own rev deps) Ocb3 version
70K 35 pgp ^0.1
ecdh-omr dev ^0.1.0