About Us

Built for multi-store
Shopify merchants

MultiStore Sync was created to solve a real problem: keeping product catalogues and inventory consistent across multiple Shopify stores without manual work.

Our Mission

We believe merchants shouldn't have to choose between running multiple stores and maintaining data consistency. MultiStore Sync bridges that gap — letting you operate a server store that acts as the source of truth, with client stores that stay in sync automatically.

Whether you're running regional stores, wholesale and retail storefronts, or separate brand channels, keeping products and inventory in sync manually is time-consuming and error-prone. We built MultiStore Sync to eliminate that burden entirely.

Who We Are

MultiStore Sync is built by PromolyApps, a team of Shopify developers who specialize in building tools for multi-store operations. With years of experience building Shopify apps and working directly with merchants who manage complex multi-store setups, we understand the challenges firsthand.

Our team has worked with merchants operating 2 to 20+ Shopify stores across different regions, brands, and channels. We've seen the pain of manually copying products, adjusting inventory across admin panels, and dealing with overselling when stores fall out of sync. MultiStore Sync was born from that experience.

How It Works

Our app uses a server/client model where one store acts as the central catalog (the server) and other stores push products to it (the clients). A secure, one-time token pairing system connects stores in under a minute — no shared API keys, no complex configuration.

Once connected, sync happens automatically via Shopify webhooks. When a client store updates a product — whether it's the price, title, inventory, images, or metafields — the server store is updated in near real-time. When a customer places an order on the server store, inventory is decremented on all contributing client stores automatically (inventory write-back).

What Makes Us Different

  • Webhook-driven sync — no polling, no delays. Changes propagate in seconds, not minutes
  • SKU-based matching — products are linked by variant SKU, so even if product IDs differ across stores, sync works reliably
  • Selective sync — choose exactly which products to sync. Enable or disable per product, filter by tag or status
  • Inventory write-back — when products sell on the server store, client stores are updated automatically to prevent overselling
  • Metafield sync — custom fields, variant data, and product metadata all sync seamlessly with automatic type detection
  • Full audit trail — every sync operation is logged with status, errors, and timing for complete visibility
  • Role-based access — server stores control what gets imported, client stores control what gets pushed
  • GDPR compliant — all webhooks are HMAC-SHA256 verified, data is encrypted in transit, and we handle all compliance webhooks

Built on Trusted Technology

MultiStore Sync is built with React Router 7 (server-side rendered for performance), Shopify's official App Bridge and Polaris design system, and PostgreSQL via Supabase for reliable data storage. All communication with Shopify uses the GraphQL Admin API (version 2026-01) and authenticated webhook subscriptions.

Our Commitment

We're committed to building reliable, secure, and merchant-friendly tools. Every feature we ship is tested against real multi-store setups. We respond to support requests within one business day, and we actively maintain the app with regular updates to stay compatible with Shopify's evolving platform.

Contact Us

Have questions, need support, or want to discuss a custom integration?

You can also reach us through our contact form or find us on social media (links in the footer below).