ConvertCalculators Engine is a powerful tool that processes data and performs calculations based on your business logic. FormulaScript is the language used within the engine to specify these rules, much like how Excel uses formulas to calculate logic. Essentially, the engine runs these FormulaScript rules to transform input data into meaningful outputs, enabling users seamlessly to incorporate complex calculations into their applications or websites. You can incorporate the engine into your external apps with an API. This involves setting up the engine with the desired calculations in Convert and using the provided API URL to integrate these capabilities with the external application. Essentially, the app sends input data to the ConvertCalculator engine via the API, the engine processes this data according to the defined FormulaScript calculations, and then returns the output to the app, enabling dynamic, real-time calculations within the external application's interface.