As developers and agency owners, we often need to justify the cost of AI API integrations to clients or ourselves. I was tired of guessing the break-even points, so I built a clean, client-side AI ROI Calculator.
The Approach
I wanted to keep it 100% Vanilla JS for maximum performance and security. No server calls, complete data privacy for sensitive financial inputs.
Here is a quick look at how the core calculation logic handles the monthly cost comparison:
function calculateROI(humanHours, hourlyRate, apiCostPerMonth) {
