On-Brand Lovable.dev ROI Calculator

I need our current ROI Excel sheet turned into a pixel-perfect, customer-friendly web interface on lovable.dev. Every formula in the workbook must be mirrored so the calculated results online are identical to what the spreadsheet produces—accuracy is non-negotiable.

While the logic stays the same, the look has to reflect our brand guidelines: the approved colour palette, our chosen fonts, and all logo or imagery assets. Feel free to refine the layout and micro-interactions so the tool feels smoother and more modern than a raw spreadsheet, but never at the expense of the maths behind it.

Please build with responsive behaviour that looks great on both desktop and mobile screens, and add solid user-input validation so people can’t break a formula with bad data.

Deliverables
• A fully functioning lovable.dev project file and live link
• Documentation showing how each Excel formula was translated and where it sits in the new build
• A brief hand-off guide for future style tweaks and content updates

If you’ve successfully cloned spreadsheets into front-end tools before and can demonstrate rock-solid accuracy, I’d love to see your approach.