Ocb3 is used at run time in 36 crates (of which 8 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 17 crates (of which 1 directly).

Depender (with downloads and own rev deps) Ocb3 version
104K 41 pgp ^0.1
36K 68 sequoia-openpgp optional ^0.1
cmail-rpgp ^0.1
vpgp ^0.1
ecdh-omr dev ^0.1.0