solana-program-pack is used at run time in 121 crates (of which 1 optionally). It is a direct run-time dependency in 2 crates. It's used only as a dev dependency in 6 crates.

Depender (with downloads and own rev deps) solana-program-pack version
1.1M 546 solana-program =2.1.0
4.4K 1 spl-record ^2.1.0