Thanks so much for the suggestion, I will have a look although I’m hoping for something which updates at least a few dozen times per minute.

Thanks so much for the suggestions! (Yes, I’m in the US)

Do you know offhand if any of those data sources update frequently enough for “real-time” visualizations?

I kind of doubt it, but you could fake a realtime api by streaming results from your backend of choice as if you were getting it from an api. Some of the data is large enough that you could download it async on your backend and stream results as you parse it! I'm actually downloading the liquor sales for my state since 2012 and so far it's over 2gb of data, so definitely stream-worthy.

I did also find this just now. https://github.com/bytewax/awesome-public-real-time-datasets

Oh, and if you do stick with react, I'd suggest this library! It's super powerful. I'm using it for some visualizations at work and it's pretty awesome what can be done. https://recharts.org/en-US/

Thanks again, I’ll have a look at this.