As of 2025, Apple has been slowly introducing variable font capabilities. While Hiragino Sans is not yet fully variable in the system (like SF Pro), there is speculation that future iOS updates will contain a Hiragino-VF.ttf where W9 becomes an axis endpoint (900). This would allow designers to fine-tune weights between W6 and W9 for responsive typography—imagine W7 for tablet landscape and W9 for mobile portrait.
: It is included as a system font on Mac and iPhone/iPad, often labeled simply as "Hiragino Sans" with the weight set to W9. hiragino sans w9