Cantusplanus.at is a comprehensive research platform dedicated to documenting the transmission of monophonic medieval chant in Austria. Since 2008, data has been gathered through various subprojects focused on choral manuscripts and fragments from the Austrian National Library, the Central Library of the Franciscans in Graz, and other monastic, regional, and university libraries. The platform also features an image database providing digital copies of chorale manuscripts from various institutions.

The website was built using HTML, JavaScript, and PHP, with the image database powered by IIIF technology.