Spreadsheet models are commonly used for calculations in various industries, but sharing and tracking versions can be challenging. Optalitix offers a solution by converting these models into APIs, allowing users to interact with them without needing to open a spreadsheet. This process involves uploading the spreadsheet to the Optalitix Models portal, selecting input and output cells, and generating an API that retains the model's logic without requiring recoding. Retool can then be used to build a user-friendly interface on top of the Optalitix API, enabling users to interact with the model through a web application. An example provided is a loan calculator, where loan amount and term are inputs, and monthly repayment is an output, with additional visualization options like tables and charts for more engaging displays. This method streamlines the use of spreadsheet models in a software application, enhancing accessibility and collaboration.