aptos-keygen is used at run time in 28 crates (of which 2 optionally). It is a direct run-time dependency in 7 crates. It's used only as a dev dependency in 5 crates.

Depender (with downloads and own rev deps) aptos-keygen version
language-e2e-testsuite ^0.2.1
2 aptos-faucet ^0.2.1
3 aptos ^0.2.1
3 language-e2e-tests ^0.2.1
aptos-create-resource-account ^0.2.1
3 aptos-consensus ^0.2.1
10 aptos-genesis ^0.2.1