When comparing PERGOLA vs NextCharts, the Slant community recommends NextCharts for most people. In the question“What are the best JavaScript drawing libraries?” NextCharts is ranked 19th while PERGOLA is ranked 25th. The most important reason people chose NextCharts is:
Besides having all consecrated charts like line, area, bar, horizontal bar, pie, bubble , it can have styles for line dots (solid dot, hollow dot, star, bow, anchor) or bar types (like dome, cylinder, parallelepiped). It has support for stacked bars, negative bars, combo bar-line charts, dual axis, click events and tooltips.
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Pros
Pro HTML
Pergola runs seamlessly in an HTML environment (option in configuration file). All the examples are provided both as SVG standalone and embedded in HTML, and are strictly equal.
Besides its universal Node Helper (http://www.svgmagazine.com/jul2011/dom-helper.html) Pergola also provides the equivalent for building HTML nodes and <foreignObject> HTML nodes.
Pro SVG native
The first and most accomplished SVG native library, 100% cross-platform compatible.
Pro Great diversity
Besides having all consecrated charts like line, area, bar, horizontal bar, pie, bubble , it can have styles for line dots (solid dot, hollow dot, star, bow, anchor) or bar types (like dome, cylinder, parallelepiped). It has support for stacked bars, negative bars, combo bar-line charts, dual axis, click events and tooltips.
Pro Free
Completely free and open-source as it uses the Apache license.
Cons
Con Commercial license
PERGOLA does not offer a free version. The price for a single developer to use PERGOLA is 400 €.