You can tweak assumptions (brain FLOPS estimate, birth rate trend, Moore's law growth rate), zoom and pan the chart, and see the crossover date update live.
If you have better sources (birth rates, brain FLOPS estimates, chip production, compute), the site has a suggestion form that opens a GitHub issue. Code and issues: https://github.com/StefanSamne/foomist
Not selling anything. I mainly want feedback on the model and better data.