It's indeed all Tailwind CSS! This was my first Django project and I started with Django 4. It has form templates that I've overridden to use Tailwind elements. This was quite tricky and meant learning more about Django than I'd expected!

Went to sign up to tire-kick but no free tier. It isn't evident what data sources the plotpanel site works with.

There’s a link just above the tiers “or start your free trial”!