The email signup form returns an error. Looks like a nice project, though! The page says it uses an grammar of graphics engine -- is it built on Vega or did you create your own?
Thanks for the warning. I think the form problem happens if you don't have cookies enabled. I will look into it.
We don't use Vega, we have created our own graphical grammar engine.
A thing I noticed: The Linux AppImage version bundles a non-stripped binary of CEF, which unnecessarily inflates the download size.