Rails Charts Using ECharts from Apache (github.com)

Any clear reason to use this over chartkick?

The calendar chart looks fun, I wonder how customisable it is in terms of colour or tooltip highlights?

If you dig elixir's LiveView, you can do something similar:

https://news.ycombinator.com/item?id=36371907

Oh, it's a library for doing random charts using rails. Not a library for doing rail charts.