sparkle is used at run time in 5 crates (of which 1 optionally).

Depender (with downloads and own rev deps) sparkle version
2.1K surfman-chains ^0.1
130 1 rust-webvr-api ^0.1
offscreen_gl_context ^0.1.3
190 rust-webvr optional ^0.1
170 2 surfman optional ^0.1