Variant-Level Collection Merchandising Router
A Shopify app for mapping variants into collections without product duplication, with a theme extension and webhook-loop safeguards.
The product
VariantCast is a pre-launch Shopify app that maps selected variants to collection contexts and uses Product Metafields plus a theme extension to present the intended image, price and URL without duplicating products. A Redis-backed webhook loop-prevention system covers idempotency, write-stamp tracking and atomic processing locks.
The storefront layer is designed for Online Store 2.0 themes without manual theme edits.
Capabilities
Three-step Polaris UI: select a product, pick a variant, choose target collections. Maps are stored as JSON Metafields on the product, so the storefront reads them directly.
A <1KB synchronous JavaScript snippet injects into the collection page <head> and swaps the product image, price and URL on DOMContentLoaded. It is designed for Online Store 2.0 themes without manual theme edits.
Prevents infinite webhook loops via Redis-backed idempotency deduplication (24h TTL), write-stamp tracking (60s TTL), and field-level diffing. Atomic processing locks prevent race conditions.
Planned pricing: a free tier with 10 active mappings and a $29/month Pro tier with a 14-day trial.
Full CRUD management with pagination, search, bulk delete, and per-mapping status. Product and collection browsers with variant-level detail and mapping badges.
Listens to products/update and collections/update webhooks to auto-refresh cached prices, images, and titles. Handles collection renames gracefully by re-keying all affected Metafields.
Product views
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