SPISEA (Stellar Population Interface for Stellar Evolution and Atmospheres) is a python package that generates single-age, single-metallicity populations (i.e. star clusters). It gives the user control over many parameters: Cluster characteristics (age, metallicity, mass, distance) Total extinction, differential extinction, and extinction law Stellar evolution and atmosphere models Stellar multiplicity and Initial Mass Function Initial-Final Mass Relation Photometric filters Here is a brief list of things that SPISEA can do: make a cluster isochrone in many filters using different stellar models make a star cluster at any age with an unusual IMF and unresolved multiplicity make a spectrum of a star cluster in integrated light Code is available for download via Github (https://github.com/astropy/SPISEA) and documentation is available via ReadtheDocs (https://spisea.readthedocs.io/en/latest/index.html).

SPISEA v2.0.0 has the same functionality as PyPopStarv1.0.1, but with the software name changed.