Highcharts provides 20 different types of [charts](http://www.highcharts.com/docs/chart-and-series-types/chart-types) to choose from, and they make it simple to [combine](http://www.highcharts.com/docs/chart-and-series-types/combining-chart-types) chart types.
Ranked in these QuestionsQuestion Ranking
Pro Excellent browser support
Highcharts supports all modern browsers (including IE6 and up), iOS and Android.
Pro Lots of good examples
The site has a selection of good examples that will help you get started quickly.
Pro Good documentation
Very handy with examples and explanations.
Pro Library to support Microsoft .NET
Compatable with .NET framework 4+, can develop graphs from server side for ASP .NETand ASP .NET MVC applications.
Pro Supports multiple Y axes
Important for trend correlation, eg. comparing number of clicks to sale amounts. Not same scales / units.
Pro Charts look beautiful
The colors and shapes of charts are very beautiful.
Pro Event handling and user interactivity
If you have data that meets certain conditions, you can highlight it or create another chart at that data point. Also, you can use the built-in data editor to simulate the chart while directly modifying the chart data
Pro The most numerous sample charts provided
30 chart types and 400 ready-to-use sample charts are pre-packaged in KoolChart, which is the most numerous provided in a single package. Here are some sample charts available.
Pro Very easy and intuitive
Pro Lazy data processing
This is a very useful feature when used with the scroll function because of the large amount of data.
Pro Candlestick charts
Pro Various types of charts are available
KoolChart provides a variety of useful charts. It can bring your business data effective visualization.
Highcharts is not free for commercial projects, with a starting price of US$590 for Single Developer + Maintenance & Support
Con The examples are not that great
For instance, example's JsFiddle may get stalled when loading.