Key Features

• Adjustable pricing and discount structures for bundles
• Customer filtering by product titles in each builder step
• Layered discounts compatible with other Shopify discounts
• Two customizable builder layouts with infinite styling options
• Forms for text input and image uploads for personalization

Verdict on ZenBox:

ZenBox has 119 reviews, making it one of the more established bundle builders. The 4.0 rating is average but reflects honest feedback across a large user base. The image upload and text input features are useful for personalized gift boxes. At $24.99/month with no free plan, it requires commitment.

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.