Best Shopify bundle & build-a-box apps for 2026

The best Shopify bundle apps let you group complementary products, apply an automatic discount, and (for build-a-box) let customers assemble their own set from a curated selection. The right choice depends on whether you want simple fixed bundles, flexible mix-and-match, or a full build-a-box experience — and whether you'd rather run bundles in their own app or alongside your other growth tools. Below are six options, starting with our all-in-one pick.

1. AI Growth Kits (Upsell & Cross Sell Booster) — best all-in-one

AI Growth Kits includes bundles and a build-a-box builder with live-updating discounts, so shoppers see the savings as they add items. Because bundles share the app with your upsells, cross-sells, reviews, and analytics, they reinforce each other: a bundle on the product page, a cross-sell in the cart drawer, and reviews right beside them all work from one dashboard. That's the edge over a standalone bundle app — you're not paying for and syncing multiple tools to run one coherent AOV strategy.

It works on any theme, including custom cart drawers, and plans are Starter $59, Growth $129, and Advanced $299 per month. See how bundles fit with the rest of the toolkit on the features page.

Install on Shopify

2. Fast Bundle

Fast Bundle supports a wide range of bundle types — fixed bundles, mix-and-match, volume discounts, and build-a-box — with a polished merchant experience. It's a strong, flexible dedicated bundling tool. Free plan available with paid tiers.

3. Bundler

Bundler is a popular, budget-friendly option for classic product bundles and quantity-break discounts. It's straightforward to set up and covers the essentials well. Generous free plan with affordable paid upgrades.

4. Kaching Bundles

Kaching (formerly Fast Bundle's peer in the space) focuses on bundle deals, volume discounts, and frequently-bought-together offers with a clean UI. A solid choice for stores wanting quick, attractive bundle widgets. Free plan available.

5. Bundles & Discounts by Pumper

Pumper offers customizable bundles, quantity breaks, and BOGO-style deals with a focus on speed and simplicity. Good for merchants who want to launch promotional bundles fast. Free tier with paid plans.

6. Shopify Bundles (native)

Shopify's own free Bundles app lets you create fixed and multipack bundles natively. It's basic compared with third-party tools — no advanced build-a-box or discount logic — but it's free and well-integrated for simple needs.

Bundle vs. build-a-box: which to use

Fixed bundles work best when there's an obvious "goes-together" set (a starter kit, a routine, a gift pack). Build-a-box shines when your catalog invites personalization — pick-your-own snack boxes, cosmetics, or subscriptions — because the act of choosing increases both engagement and cart size. Many stores run both.

Tips for bundles that actually sell

A bundle app is only as good as the bundles you build with it. A few principles hold across catalogs: anchor the discount so shoppers can see the savings versus buying separately; keep bundles to three or four items so the value is obvious at a glance; and lead with a clear outcome ("the complete starter kit") rather than a generic "bundle and save." For build-a-box, set a minimum and maximum number of items so the box feels curated, not overwhelming, and show a running total and discount as the customer adds products. Finally, feature your best bundle on the product page and in the cart drawer, not buried on a separate collection — the closer the bundle is to the moment of decision, the more it converts.

Bundles are one lever in a bigger AOV strategy. Combine them with upsells and cross-sells (see the best Shopify upsell apps), a strong cart-drawer setup, and the tactics in how to increase average order value on Shopify.