硬笔临帖 is an education app by Yuan Dahui with 10,000+ downloads (about 19K estimated). +127 installs in the last 7 days. Rated 4.1 from 104 ratings. Released Jan 10, 2014. Install growth, rank history, SDKs and ad networks.
From the store listing: “It includes built-in traditional Chinese poetry and culture content, making it easy to generate calligraphy practice books, supporting copying, tracing, creation, and saving of works.”