subtle-ng is used at run time in 411 crates (of which 68 optionally). It is a direct run-time dependency in 8 crates. It's used only as a dev dependency in 23 crates.

Depender (with downloads and own rev deps) subtle-ng version
278K 21 curve25519-dalek-ng ^2.5
550 4 secp256kfun ^2
450 1 ore-rs ^2.5.0
secp256kfun_parity_backend ^2
2 sunscreen_bulletproofs ^2.4
4 sunscreen_curve25519 ^2.5
secp256kfun_k256_backend ^2
1 schnorrkel-purplecoin ^2.5.0