The article introduces a tool that allows developers to create custom calculators for various purposes with minimal coding. This tool, found at innovationforu.com/calculator-build/, enables users to design and embed personalized calculators on websites or as web apps on mobile. The calculators created are mobile-friendly by default, offering a native app-like experience for users. The article also suggests various ideas for custom calculators, such as mortgage affordability, ROI calculators, nutrition calculators, and event budget calculators, highlighting the versatility and potential applications of this tool for different user bases.