[Blahah]

You've completely missed the point. The site is for developers who make visualisations to be able to allow users to use the visualisations with their own data. It requires you to first create the vis code, then use the Blockspring API to wrap the data source, then the website auto-generates a data upload form that populates the plot.

[CaveTech]

As someone unfamiliar with the product entirely, this point was very non-obvious. Especially since nothing on the original page linked to the main ui.