SPIE BiOS, 2019 (Optical Methods for Tumor Treatment and Detection) – We introduce our Dosie modeling software that helps in predicting outcomes of Photodynamic therapy (PDT) against cancer. It can be used as a dosimetry and treatment planning software for intracavitary and surface PDT. Three types of doses can be monitored: (conventional) light dose, PDT-dose, and the reacted singlet oxygen dose. Our presentation at Photonics West 2019, BiOS: Meeting: Optical Methods for Tum