SellStack

SellStack, officially listed on the Shopify App Store as SellStack: Bundles & Upsells, is a Shopify app in the Product bundles category. SellStack provides a sales-boosting toolkit designed for Shopify order value optimization and customer loyalty. Build discount scenarios and adjust cart values by providing deals to your customers. The user-friendly interface requires no coding knowledge to start creating product bundle options in minutes. Leverage features like quantity breaks, volume discounts, and mix & match bundles. Our solution simplifies storefront promotions with customizable widgets and theme integration. It averages 5.00 out of 5 across 3 merchant reviews on the Shopify App Store.

SellStack offers a free plan and 2 paid plans starting at $9/month and going up to $19/month. The free plan includes All features included, 1 Product, Up to 50 orders/month, and Branded Widget. The paid plans unlock advanced features beyond what's available on the free tier.

Yes — SellStack offers a free plan alongside paid options. The free plan includes All features included, 1 Product, and Up to 50 orders/month. Paid plans start at $9/month for advanced features.

SellStack launched on May 6, 2026. In that time it has gathered 3 merchant reviews.

SellStack does not currently carry Shopify's Built for Shopify badge. The badge is awarded to apps that meet Shopify's published standards for performance, ease of use, and merchant value — many high-quality apps operate without it.

Merchants commonly compare SellStack with Kaching Bundles App & Upsells, BOGOS, Pumper Bundles Quantity Breaks, and FBP. Each alternative covers a similar use case but differs on pricing model, integration depth, and the specific themes merchants praise in reviews — see the alternatives section above for a side-by-side.