WishList Ninja Syncs Shopify Wishlist Data to Email Platforms in Real Time

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A new Shopify app called WishList Ninja addresses a common gap where wishlist data remains siloed within the app and never reaches a merchant's email marketing platform. The app writes live profile properties — including an active wishlist flag, item count, value, and top saved item — directly to Klaviyo, Mailchimp, or Omnisend on every save or removal. A key engineering challenge was ensuring the has_active_wishlist flag resets to false whenever a wishlist empties, covering edge cases like purchases, account merges, and collection-only saves. Five of the app's seven email flow triggers are derived from diffing Shopify product update webhooks against saved items, eliminating the need for scheduled catalog scans. The storefront component weighs under 12KB of vanilla JavaScript, and the app is now available on the Shopify App Store.

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