The paid version of Plotalot comprises the Plotalot Plugin (you should also download Plotalot itself, which is free). The main function of the plugin is to merge charts into a Joomla article. It also adds some advanced features, listed in the User Manual. Subscribers also receive support for Les Arbres Design software. A subscription to "All Software Support and Upgrades" is required to download the Plotalot Plugin.

Plotalot Pro was created by Chris of Les Arbres Design.

Unfortunately, Chris has withdrawn from software development because of ill health. In order to give Plotalot a healthy future, it is now being supported and developed here.