Treestar.FlowJo.v10.4 FlowJo® is the leading analysis platform for single-cell flow cytometry analysis. With an intuitive interface, specialized analysis platforms, and open-ended plugin architecture, FlowJo® provides a rich analysis environment that is easy to use, versatile and extensible. The FlowJo® workspace is a powerful statistical environment that is used for immunophenotyping, cell cycle, proliferation, kinetics studies, quantitative population comparison, or plate screening assays to name a few.