The scale typically runs from W1 (Ultra Light) to W9 (Ultra Heavy/Black).
Hiragino Sans W9 has become a popular choice for various design applications, including: hiragino sans w9
Historically, Apple shipped (Proprietary). As of macOS Sierra and iOS 9, Apple transitioned to Hiragino Sans . Hiragino Sans is an OpenType reworking of the classic Kaku Gothic, offering better screen rendering, improved hinting, and a unified weight axis. W9 exists in both, but the Sans W9 variant benefits from modern font smoothing and variable font potential. The scale typically runs from W1 (Ultra Light)