MathSearch is a new service that allows to search for mathematical formulae in documents indexed in zbMATH. It offers open access to formulae retrieval using the MathWebSearch system, which is a content-based search engine for MathML formulae based on substitution tree indexing. The first prototype is a result of a research project with the Jacobs University Bremen, funded by the Leibniz association, which aims at developing concepts and methods for a semantic analysis and retrieval of mathematical formulae in the zbMATH corpus.