The plugin is integrated to use Readygraph growth engine to increase your subscriber base using intelligent popup and invite flow. Whereas, you can use the simple-subscribe without readygraph by simply disabling the readygraph plugin.
Here to note that, readygraph plugin enhances the user capture through popup and mailing features. More features are about to be released which will let you track daily subscriber insights, mass email from wordpress, export, import your contact list as your website’s subscribers.
You can provide your feedback about readygraph plugin at https://www.ads-software.com/support/plugin/readygraph
