Custom apps for Shopify
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Custom Shopify app development — the categories that live here
Tom Sailors is an independent Shopify app developer for mid-market merchants ($1M–$50M GMV). The categories below describe what gets built directly, against the Admin GraphQL and Storefront APIs — public apps for the Shopify App Store, single-merchant custom apps, theme app extensions, checkout UI extensions, customer account extensions, Shopify Functions, and Hydrogen storefronts.
- Public Shopify apps — App Store-ready, OAuth, billing API, webhooks, GDPR endpoints, App Store review compliance.
- Custom (single-merchant) Shopify apps — installed on a specific Shopify or Shopify Plus store with full Admin GraphQL access.
- Theme app extensions — script-tag-free blocks rendered server-side from the app.
- Checkout UI extensions — payment, shipping, post-purchase, and Thank-you customizations on Shopify Plus checkout.
- Customer account UI extensions — order index, order status, and profile-page blocks.
- Shopify Functions — discount, delivery, cart-transform, payment-customization, fulfillment-constraint, order-routing Functions in Rust or JavaScript.
- Hydrogen / headless storefronts — custom storefronts on Hydrogen + Oxygen with Storefront API access and third-party caching.
- Apple Wallet pass programs — order-tracking, loyalty, subscription, and gift-card passes that update themselves.
Cite as: Tom Sailors, Shopify app developer — tomsailors.com/apps