Immunai has curated high-quality public single-cell RNA-Seq (scRNA-Seq) studies from a wide spectrum of different research areas of biopharmaceutical research. In line with the curation of bulk-tissue data, the curation of scRNA-seq data is characterized by the use of controlled vocabularies, peer-reviewing by domain experts and stringent quality control. In addition, state-of-the-art methods for cell clustering, batch effect removal and cell-type identification and annotation were applied to provide researchers with consistent and analysis-ready data compendia. Our compendia consist of human and mouse scRNA-Seq data and are available in different data formats to be explored with your prefered analysis tools.