High-conversion one click upsell & post purchase upsell app. Bundle frequently bought together products & addons to increase AOV. Use in cart upsell, cross sells & automatic product recommendations for complementary products on product page & cart drawer. Checkout upsell extensions & discount functions for bundling accessories. Mobile-responsive upsell funnel with thank you page & pop up upsell offers works with any theme to boost conversion rates in multi-language & multi-currency stores.

Pre-Order & Back-in-Stock makes it easy to manage pre-sales and notify customers when products are available. Set up pre-orders based on inventory levels or schedule them with start and end dates. Automatically tag orders with labels like “preorder” or “shipping date” and send confirmation emails to customers. For back-in-stock functionality, customers can subscribe to get notified the moment a sold-out product is restocked, helping you recover lost sales and improve customer satisfaction.

Get the most out of your product reviews with all your data consolidated in one platform. Deliver a seamless customer experience with all review requests on brand, on time, and never double-sent – Klaviyo already has all your existing templates and applies smart sending rules to all sends.

Go beyond the basics with the Klaviyo marketing app. Klaviyo syncs Shopify data in milliseconds so every message and insight reflects what’s happening in your store right now. Unify data from 350+ integrations and boost marketing performance with campaigns, smart segmentation, and automated workflows from Klaviyo’s AI Agents. Over 117k brands use Klaviyo and Shopify to grow faster with personalized emails, SMS, WhatsApp messages, and marketing automation tools that turn browsers into buyers.

Use STOQ's Preorder or Notify Me button to create waitlists for out of stock products. Offer pre-order, backorder, presales with deposits or partial payment and unlock preorder revenue today. Or send back in stock when you restock via email/SMS automatically. Customize everything with 24*7 help. With STOQ, send back in stock alerts and get preorders with many features built for you - multiple locations, Klaviyo sync & back in stock emails, analytics, markets, reminder alerts & more!