Excel. In a very profound way it aligns with how humans naturally think. This is far beyond the concepts of UX/UI. It's like someone invents the pencil, and it

Excel. In a very profound way it aligns with how humans naturally think. This is far beyond the concepts of UX/UI. It's like someone invents the pencil, and it becomes so ubiquitous you stop thinking about it as a tool that didn't exist all that long ago. Having read most of Joel Spolsky's blog suggests this was not something that just happened. All the same, few have achieved what Microsoft has achieved with Excel.