Sources Chrétiennes Online (SCO) is the digital and searchable counterpart to the long-running edition project of the Institut des Sources Chrétiennes (Lyon), published by Les Éditions du Cerf (Paris). This first release contains 200 (titles list) of the project’s Latin and Greek source texts and French translations. The total number of editions in the printed volumes exceed 600, which will all be incorporated into the SCO database by 2025.