The Copper Key, an innovative online tool presented by Kupferverband e.V. and implemented by Matplus®, is a valuable resource for engineers and materials scientists, offering an easy and comprehensive way to compare national standards (ASTM, DIN, EN, BS), materials, and designations for copper alloys. The EDA®-based system offers extended search and analysis functions. Beyond full-text queries, searches can be conducted based on material composition, standards and properties. The platform provides interactive data analysis, bidirectional linking between standards, designations, and product forms, and a user-friendly interface with language and unit switching (German and English). Access is free of charge after registration.