Product Bundling Lock App for Conditional Add-Ons
The Opportunity
A bundling and cart-logic app that lets merchants make one product purchasable only when another qualifying product is already in the cart. It would be useful for gifts, warranty add-ons, samples, accessories, and gated bonus items.
"Merchants want Product B to be available only as an add-on to Product A, but not sold independently, and need a simple App Store solution to enforce that cart rule."
Market Validation
Detailed Analysis
Proposed Solution
Create an app that lets merchants define dependency rules such as 'must have Product A in cart before Product B can be added.' The app should enforce the rule in cart, product page, and checkout validation, with optional automatic add-to-cart behavior, hidden direct purchase, and error messaging.
Target Audience
Shopify merchants selling gift-with-purchase offers, add-ons, bundles, accessories, or restricted bonus items
Competitive Landscape
Bundler, Bold Bundles, PickyStory, Simple Bundles, VolumeBoost, various bundle/upsell apps
Implementation Notes
Implement cart and storefront validation using theme app extensions, cart attributes, and Shopify Functions where available to block standalone purchase of dependent items. Provide a rule builder for parent-child product relationships, optional collection-based rules, redirect/error handling, and analytics for blocked attempts and successful add-on conversions.
Evidence from Merchants
Real quotes from Shopify community forums
"I am looking to set up a system where a customer can only add Product B (a gift) to their cart if they’ve already added Product A."
Key Pain Points
Need for conditional product purchasing
mediumMentioned by 1 merchants
Impact: Loss of potential sales if customers cannot purchase add-ons correctly
Market Metrics
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