I built a similar LCH space explorer, which doesn't require Java: http://palette.sambleckley.com/ http://palette.sambleckley.com/ I use it pretty often; it's

I built a similar LCH space explorer, which doesn't require Java: http://palette.sambleckley.com/ http://palette.sambleckley.com/ I use it pretty often; it's easy to ensure accessible contrast, etc, when L values are consistent.