From Excel Cells to Real-Time Market Intelligence: The Evolution of the Heatmap
A heatmap is just colour on a grid. But the journey from conditional formatting in a spreadsheet to real-time financial market visualisation reveals everything about how we learned to see data differently.
There is a moment most developers remember from their early career when they first encountered a heatmap that actually meant something.
Not the Excel conditional formatting exercise from a tutorial. Not the gradient background on a website analytics page that nobody looked at. The first heatmap where the colour told you something urgent — where a square went red and you understood immediately, without reading a number, that something needed attention.
That moment of instant comprehension is what heatmaps are designed to produce. And getting from the first attempts to the version that produces it reliably is a longer journey than it looks.
