Key Features

• Product bundles and free gifts with mix-and-match options and auto-applied bundle logic
• Cart drawer and cart upsell functionality that works across all themes and third-party apps
• Post-purchase upsells and customizable thank-you page offers
• Volume discounts, quantity breaks, and BOGO deal builder
• Bundle builder with fully customizable styling and layout options

Verdict on Moon

Moon Bundles is one of the best-value bundle apps on Shopify, combining bundles, cart drawer upsells, post-purchase offers, and volume discounts into a single install. The generous free tier and Built for Shopify badge make it a safe bet for any merchant. Its multi-language support and theme-wide compatibility stand out among competitors. The revenue cap pricing model is transparent — you only upgrade when your bundles are actually making money.

Key Features

• Ajax Cart: add to cart from catalog without visiting product pages
• Auto-generated recommendation products after adding to cart
• Unlimited upsells with no viewer count charges
• Fully customizable Add to Cart button styles
• Google Analytics and Facebook Pixel tracking integrated

Verdict on NML

NML Quick Add to Cart is a completely free app for adding quick-purchase buttons and upsell recommendations to catalog pages. With zero reviews, it is unvalidated. But since it is free, there is no risk in testing. The GA and Facebook Pixel integration is a useful bonus.