Let me keep it quick and simple before giving anymore context.
- Lets you combine seemingly unrelated charts. E.g. Gantt chart and line chart
=> both charts have different series but should be overlayed on top of each other
- Free or lifetime license
What have I looked at?
Google charts => free, can combine charts but only a certain type of charts (not including the Gantt chart)
amChart => free (to some extent) but not able to combine charts (I looked into this because we are used this inside our company)
Highcharts => free (to some extent) lets you combine charts but on the same series (if I'm not missing something)
Chartjs => free, lets you combine charts with different series, but does not seem to have a Gantt chart (again correct me if I'm wrong).
Why is this necessary?
We are developing a system where fruit growers can estimate their expected yield for a certain amount of cultivations. Each harvest period will be displayed in a Gantt chart for every cultivation. Mapping on top of that the expected and the actual yield (hence line chart).
Any advice is welcome.