adler2 is used at run time in 40,331 crates (of which 31,121 optionally). It is a direct run-time dependency in 1 crate. It's used at build time in 718 crates (of which 470 optionally, ). It's used only as a dev dependency in 3,425 crates.

Depender (with downloads and own rev deps) adler2 version
17.1M 120 miniz_oxide ^2.0