Shanghai Ratta Smart Technology Co., Ltd.

Shanghai Ratta Smart Technology Co., Ltd. offers Supernote, a focused digital notebook product line for handwriting, sketching, reading, and document annotation. Its devices combine stylus-based input with tools for organizing notes, recognizing handwriting, and managing documents. The company emphasizes a paper-like writing experience, offline use, ongoing software updates, and modular design intended to support repair and upgrades.