White-Label AI Product Recommendation Engine for Ecommerce Agencies

A RapidDev custom build runs $13,000–$25,000 for the full multi-tenant platform including Shopify App Bridge integration, pgvector recommendation engine, tenant admin dashboard, and Stripe billing. The Lovable DIY path costs $25 (Lovable Pro) plus ~$10 in OpenAI embedding credits for a working weekend MVP. Ongoing infrastructure on Supabase Pro + Vercel Pro runs $45–$100/mo regardless of merchant count.

The Lovable DIY path produces a working multi-tenant MVP in a weekend (12–16 hours). A RapidDev custom build takes 5–7 weeks including Shopify App Bridge setup, pgvector index optimization, webhook listeners, and billing integration. The longest single task is initial catalog ingest for merchants with 10K+ SKUs — plan 1–2 extra days for large catalogs.

Yes — RapidDev has shipped 600+ applications including multiple ecommerce personalization platforms. The standard engagement is $13,000–$25,000 for a production-ready white-label recommendation SaaS. Start with a free 30-minute consultation at rapidevelopers.com to scope your specific Shopify integration requirements and merchant count.

It's the same category — product recommendations on ecommerce storefronts — but a fundamentally different economic model. Algolia sells per-merchant subscriptions (minimum ~$250/mo) with no rebrandable tier; your custom build serves N merchants from a single Supabase instance at a flat infra cost. At 10+ merchants, the economics flip decisively in favor of the custom build.

Two approaches: (1) Use content-based recommendations only (pgvector similarity on product catalog) for the first 60–90 days — this works well for merchants with descriptive product titles and tags; (2) Optionally use GPT-5.4 nano to generate synthetic affinity pairs based on product attribute compatibility ('yoga mat' pairs well with 'yoga blocks' and 'meditation cushion'). Flag synthetic pairs in the database and replace with real co-occurrence data as orders accumulate — typically 500 orders gives enough signal for reliable collaborative filtering.

pgvector ANN queries typically return in 20–50ms from a Supabase instance co-located with your Vercel edge functions. Adding the co-occurrence lookup is a parallel query that doesn't add to total latency. The optional Claude Haiku 4.5 rationale call adds 150–250ms — keep it conditional and document the latency impact to premium merchants. Total response time from widget fire to rendered carousel is typically under 200ms for standard tier, under 450ms for premium with rationale.

The pgvector recommendation engine is platform-agnostic — any storefront that can fire a JavaScript API call and display the response can use it. The platform-specific work is the catalog ingest connector (WooCommerce REST API instead of Shopify Admin API) and the placement widget (a Shopify Theme App Extension versus a generic JS snippet). Budget an extra 1–2 weeks of development to add WooCommerce or BigCommerce support beyond the Shopify scaffold.

Quality is per-merchant — each tenant has isolated catalog embeddings, order history, and co-occurrence data in their own RLS-protected rows. Onboarding a new merchant doesn't affect existing merchant recommendation quality. The only shared resource is Supabase compute, which scales on the Pro tier. At 100+ merchants with large catalogs, consider partitioning the pgvector index by merchant_id namespace to keep ANN query latency below 100ms.