env_filter is used at run time in 2,072 crates (of which 178 optionally). It is a direct run-time dependency in 9 crates. It's used at build time in 30 crates (of which 2 optionally, ). It's used only as a dev dependency in 950 crates.

Depender (with downloads and own rev deps) env_filter version
8.9M 8214 env_logger ^0.1.0
389K 58 android_logger ^0.1
16K 6 logforth ^0.1.1
5.6K hilog ^0.1.0
500 hitdns ^0.1.0
300 krossbar-logger ^0.1
120 krossbar-log-viewer ^0.1
1 gelf_logger ^0.1.0
krossbar-log-control ^0.1