  We present SPISEA (Stellar Population Interface for Stellar Evolution and
Atmospheres), an open-source Python package that simulates simple stellar
populations. The strength of SPISEA is its modular interface which offers the
user control of 13 input properties including (but not limited to) the Initial
Mass Function, stellar multiplicity, extinction law, and the
metallicity-dependent stellar evolution and atmosphere model grids used. The
user also has control over the Initial-Final Mass Relation in order to produce
compact stellar remnants (black holes, neutron stars, and white dwarfs). We
demonstrate several outputs produced by the code, including color-magnitude
diagrams, HR-diagrams, luminosity functions, and mass functions. SPISEA is
object-oriented and extensible, and we welcome contributions from the
community. The code and documentation are available on GitHub and ReadtheDocs,
respectively.
