The pro version is built on top of the free plugin but adds a few very useful features for you to use.

Feature Free Version Pro Version
Create vendors and predefine affiliate links
Create coupons and link them to vendors
Display coupons via shortcode on the frontend
Multiple options in order to filter/sort your coupon presentations
Configuration page for more options and customizations
Support for Accelerated Mobile Pages (AMP)
Core templates: Standard, Grid, List & Widget
Widgets for displaying coupons in your sidebar
Click to reveal discount codes
View, copy & click statistics
Event Tracking via Google & Piwik
Coupon detail pages
Additional templates: Banner & Widget Small
Additional Widgets: Coupon Page & Popular Coupons
Feature & highlight single coupons
Additional coupon styles: Light & Dark
Customize existing and create new templates
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