以观书法 is a comprehensive Chinese calligraphy tool that offers a vast collection of calligraphy styles, including regular script, cursive script, clerical script, seal script, and official script, with over 4 million character shapes. It also features a wide array of historical calligraphy masterpieces, accompanied by detailed explanations and annotations. Additionally, it serves as a creative tool for calligraphy enthusiasts, providing inspiration through authentic calligraphy fonts and abundant literary content such as poems and couplets.

Furthermore, 以观书法 serves as a repository of ancient Chinese dictionaries, encompassing renowned works like the Kangxi Dictionary and Shuowen Jiezi for easy reference and scholarly research. Moreover, it functions as a professional calligraphy teacher, offering numerous tutorials and a wealth of guidance videos featuring masterful imitations for enthusiasts to learn from.