This plugin focuses on building a powerful referral system for WooCommerce stores. Instead of monetizing your referral program, you can reward your shoppers with coupons for their successful referrals. The coupons can be calibrated either as discounts for their next purchase or even free items, making it a win-win for your business and your shoppers: they get rewards and you get more customers.

Highlights:

• Simple configuration: You can easily define the type of coupon, minimum orders required to qualify, and set the value for each coupon.
• Automatic display: A referral's coupon will be automatically shown on the account page so it's always visible and accessible for use.
• Light and fast: The plugin is programmed for lighter and faster processing.

Read more at: https://beeketing.com/blog/best-woocommerce-plugin...

Another list of Best Shopify Apps: http://shopifybestapps.com/