
I think Google Charts is best for API Documentation. It supports all types of graphs and the customization is very simple too. I feel like they offer complicated features with just a click. Review collected by and hosted on G2.com.
It requires a network connection and I think that is the biggest con, Secondly, it does not offer high level statistical processing. It does not compare to tableau or Power BI in terms of formula based graphs but it still performs better than Excel in my opinion. Review collected by and hosted on G2.com.