Focus on technical fields, helps user can easily take notes/illustrations on photo with high precision, track details and share works, intuitively and productively.

User can draw line/curve with multiple kinds of arrow and format, beside rectangle, ellipse, round rectangle, triangle, quadrangular, polygon, plenty kinds of text like plain text, callout(comic) text box, pointer text, spotlight, magnifier, text highlight, free draw, icons ... User can point and illustrate directly to the attention point, makes work faster and productive.