<p>This study introduces OrchidCounts (<a href="http://orchidcountsdb.epizy.com/">http://orchidcountsdb.epizy.com/</a>), a comprehensive database dedicated to chromosome number and genome size data for the most representative orchid subfamily: the Epidendroideae. While existing databases provide extensive information, they often lack the careful curation necessary for evolutionary studies. Addressing this gap, OrchidCounts presents an online platform focused exclusively on peer-reviewed data verified directly from the original sources. This survey documents significant variations in chromosome numbers (24-fold) and genome sizes (119-fold), doubling the known ranges for the last trait and underscoring the importance of larger sample sizes to accurately capture the cytogenetic diversity within Orchidaceae. The data reveal biases in cytogenetic sampling, with certain tribes—such as Epidendreae, Cymbidieae, Malaxideae, and Vandeae—being well represented, while others, particularly those with restricted distributions, remain underexplored. Notably, some tribes, such as Thaieae, Xerorchideae, and Wullschlaegelieae, lack any cytogenetic data. In this context, the OrchidCounts database unifies previously scattered cytogenetic information, offering a valuable resource of curated cytogenetic data for researchers investigating the evolution of cytogenetic traits in plants. Based on the critical role of cytogenetic traits diversity in understanding plant evolution, comprehensive and carefully curated databases is a valuable tool to advance on plant biology research. In this sense, future updates will expand the database to include new Epidendroideae data and additional subfamilies, enhancing its relevance for evolutionary and phylogenetic studies.</p>