SiteBox スケッチ is a smartphone application developed by KENSETSU SYSTEM Co.Ltd. It allows users to easily create on-site diagrams for electronic blackboards. This app enables efficient management of as-built and photo documentation in construction management tasks by allowing users to create diagrams on the spot without having to return to the office.

The app offers a wide range of features, including the ability to draw straight lines, circles, dimension lines, as well as freehand sketching and hatching. With its intuitive interface, even first-time users can easily utilize the app. It is important to note that diagrams created with "SiteBox スケッチ" can only be used with the separate app "SiteBox".